Abstract: A magnetic multilayer film having magnetoresistance (MR) is prepared by depositing at least two magnetic thin films having different coercive forces while interposing a non-magnetic thin film therebetween. A first magnetic thin film having a lower coercive force has a squareness ratio SQ.sub.1 of 0.01-0.5, an anisotropic magnetic field Hk of 1-20 Oe, and a thickness t.sub.1, a second magnetic thin film having a higher coercive force has a squareness ratio SQ.sub.2 of 0.7-1.0 and a thickness t.sub.2 .ltoreq.t.sub.1, and the non-magnetic thin film has a thickness t.sub.3 .ltoreq.200 .ANG.. A first preferred form requires 4 .ANG..ltoreq.t.sub.2 <30 .ANG. and 6 .ANG..ltoreq.t.sub.1 .ltoreq.200 .ANG.. A second preferred for requires 4 .ANG..ltoreq.t.sub.2 <20 .ANG. and 10 .ANG..ltoreq.t.sub.1 <20 .ANG.. A third preferred form requires 4 .ANG..ltoreq.t.sub.2 <30 .ANG. and 6 .ANG..ltoreq.t.sub.1 .ltoreq.40 .ANG..

Abstract: A magnetic head of the present invention has a magnetic core and a substrate for supporting the magnetic core. The magnetic core has a magnetic layer which is of a soft magnetic alloy mainly composed of FeTaN. The composition of the alloy meets 72.ltoreq.x.ltoreq.82, 5.ltoreq.y.ltoreq.15, 10.ltoreq.z.ltoreq.15 by atomic percent, where the alloy is indicated to be Fe.sub.x M.sub.y N.sub.z. The magnetic layer contains crystal grains of body-centered cubic structure, and each diameter of said crystal grains is less than 10 nm. The crystal grains have lattice planes which are orientated at random.

Abstract: In a magnetic field sensing method in accordance with the invention of the present application, a magnetic sensor comprising a conductor and at least one magnetic material provided on any of the surfaces of this conductor, is employed. This magnetic sensor is disposed in the vicinity of an external magnetic field which is to be sensed, and by means of supplying a high frequency current to this conductor, the impedance of the conductor changes in accordance with the external magnetic field, and based on this, the external magnetic field is sensed.

Abstract: A magnetometric sensor has a wide p-portion formed of almost perfectly spin-polarized material, a wide d-portion also formed of almost perfectly spin-polarized material different in coercive force and a narrow n-portion provided between the wide p-portion and the wide d-portion formed of the almost perfectly spin-polarized material or non-magnetic material, and one of the p-portion and the d-portion changes the spin axes of the conduction electrons in the opposite direction to the other in the presence of a magnetic field for providing a potential gap between the Fermi surface of the p-portion and the Fermi surface of the d-portion, thereby causing electric current to change the amount thereof.

Abstract: In a magnetic field sensing method in accordance with the invention of the present application, a magnetic sensor comprising a conductor and at least one magnetic material provided on any of the surfaces of this conductor, is employed. This magnetic sensor is disposed in the vicinity of an external magnetic field which is to be sensed, and by means of supplying a high frequency current to this conductor, the impedance of the conductor changes in accordance with the external magnetic field, and based on this, the external magnetic field is sensed.

Abstract: An E-shaped core is composed of a main core and side cores which are combined into one piece. A coil is wound around a bobbin which is inserted in the main core. A plate-shaped auxiliary core is connected to a sliding member. Connecting the E-shaped core and the auxiliary core completes the assembly of the magnetic head for a magneto-optical recording device. The auxiliary core surrounds the main core; therefore, the concentration of the magnetic flux at the end of the main core can be enhanced and the efficiency for generating magnetic field for a recording medium can be improved. In addition, the use of the E-shaped core and the plate-shaped auxiliary core permits easier machining of the cores.

Abstract: A recording head for a magnetic printer utilizes a so-called magnetography, in which a magnetic latent image formed on a magnetic recording medium is developed and actualized by a magnetic toner and which image is transferred and fixed on a sheet of recording paper to provide a hard copy. The recording head for a magnetic printer includes a first thermal head member, second thermal head member juxtaposed with the first thermal head member with a space therebetween, and a magnetic head member arranged on the first and the second thermal head members. A magnetic gap of the magnetic head member extends immediately above the space between the first and the second thermal head members linearly in the same direction. By this structure, a recording head for a magnetic printer which has simple structure and allows formation of a magnetic latent image having clear boundary between opposite magnetic polarities on a magnetic recording medium, is provided.

Abstract: A magnetic head for use in a VCR includes a pair of cores, a pair of sets of coils, an insulating member, a thin film magnetic layer and a thin film protection layer. Furthermore, a method for the manufacture of the magnetic head includes the steps of: providing a pair of cores having an "I" shaped core and a "C" shaped core; forming an insulating member between posterior portions of the cores, joining the cores with each other; depositing a thin film magnetic layer on a frontal face of each of the cores; patterning the thin film magnetic layer in such a way that the thin film magnetic layer has a horizontal slit; and depositing a thin film protection layer on top of the thin film magnetic layer, thereby forming the magnetic head.

Abstract: A magnetic recording medium having an improved S/N is provided by using a ferromagnetic metal thin film having a mean value of a fluctuation field of magnetic viscosithy measured at 25.degree. C. in a region in which an applied magnetic field strength is 0.8 to 1.2 times as large as a remanence coercivity, of between 15 Oersteads and 30 Oersteads, and preferably a coercivity of between 700 Oersteads and 2000 Oersteads.

Abstract: A ratio tW/pL of a track width tW to a width pL of an end face, in a traveling direction, of a main pole which performs recording or reproduction on or from the magnetic recording layer of a medium, and a saturation magnetic flux density Bs. (T: tesla) of a magnetic material constituting the main pole satisfy:(A.sub.1 .times.Bs+B.sub.1).sup.2 +C.sub.1 .ltoreq.tW/pL.ltoreq.(A.sub.2 .times.Bs+B.sub.2).sup.2 +C.sub.2for A.sub.1 =4.3.times..delta.+0.4, B.sub.1 =-16.2.times..delta.-0.3, C.sub.1 =2.2.times..delta.+0.3, A.sub.2 =378.times..delta..sup.2 -66.times..delta.+4.2, B.sub.2 =264.times..delta..sup.2 -43.times..delta.+2.1, and C.sub.2 =9.times..delta.-2.5 where .delta. (.mu.m) is a distance from the end face of the main pole to the soft magnetic under layer.

Abstract: A magnetic sensor using heterojunction transistors for detecting magnetically recorded data. The sensor has a pair of heterojunction transistors T1, T2 connected in a differential circuit disposed on a substrate 18. The substrate 18 is carded on the free end of a suspension arm 12 at a distance D from the surface of a disk 14 having magnetically recorded data thereon. The transistors are disposed a distance S apart which is selected with D so that the magnetic field direction at one transistor is generally perpendicular to the disk 14 and the magnetic field direction at the other transistor is generally parallel to the disk 14 when a magnetic transition occurs immediately adjacent the magnetic sensor.

Abstract: A ferromagnetic film made of an alloy of FeMQC-R, wherein M is at least one element selected from Hf, Zr, Ta, Nb, W, Ti, Mo and V; Q is at least one element selected from Cr, Rh and Ru; and R is at least one rare earth element such as Sm, Nd, etc., is low in magneto-striction, high in saturation magnetic flux density, good in soft magnetic properties and excellent in corrosion resistance, and suitable for producing a magnetic head having a high and stable reproducing output for a long period of time.

Abstract: A non-magnetic single crystal of Mn--Zn ferrite obtained by a solid phase reaction process including the steps of contacting a seed single crystal ferrite with a polycrystal crystal ferrite and producing the single crystal by growing the single crystal in a direction from the seed single crystal toward the polycrystal under heating. The single crystal of Mn--Zn ferrite has a composition defined by points A, B, C, D and E in a three-phase diagram of Fe.sub.2 O.sub.3 --MnO--ZnO, in which:A: Fe.sub.2 O.sub.3 40 mol %, MnO 10 mol %, ZnO 50 mol %;B: Fe.sub.2 O.sub.3 40 mol %, MnO 35 mol %, ZnO 25 mol %;C: Fe.sub.2 O.sub.3 70 mol %, MnO 5 mol %, ZnO 25 mol %;D: Fe.sub.2 O.sub.3 70 mol %, MnO 2 mol %, ZnO 28 mol %; andE: Fe.sub.2 O.sub.3 48 mol %, MnO 2 mol %, ZnO 50 mol %.

Abstract: A thin film low profile write head is provided which has first and second pole pieces which are magnetically connected in a pole tip region and at a back gap. The pole tip region is located between the head surface and a zero throat height and the head has a body region which is located between the zero throat height and the back gap. A plurality of insulation layers are located above the first pole piece in the body region. Each of the insulation layers has an apex where the insulation layer commences and each insulation layer extends from its apex toward the back gap. The plurality of insulation layers typically includes first, second and third insulation layers. In the preferred embodiment the apex of the second insulation layer is located at and defines the zero throat height of the head. This enables a very narrow track width second pole tip to be constructed simultaneously with the second pole piece using ordinary photolithography processes.

Abstract: A soft magnetic thin film represented by the formula Fe.sub.a X.sub.b Zr.sub.c B.sub.d, wherein a, b, c and d stand for atomic percents for respective components and X indicates at least one of Co, Ni, Cr and V. The proportions of the components is such that 86.ltoreq.a+b.ltoreq.93, 0<b.ltoreq.10, 4.ltoreq.c.ltoreq.9 and 1.ltoreq.d.ltoreq.8. The thin film exhibits satisfactory soft magnetic properties even when it is formed by thin film forming methods through vapor deposition, such as sputtering.

Abstract: A magnetic head assembly used for an information storage medium including a sliding surface according to the present invention includes a magnetic-field generation means having a magnetic pole and for giving a magnetic field to the information storage medium; a slider means coupled with the magnetic-field generation means, the slider means having a projecting portion which projects toward the information storage medium; and a load means coupled with the slider means, the load means giving a pressing force to the slider means in a direction perpendicular to the sliding surface, and pressing the projecting portion onto the sliding surface, wherein a surface of the projecting portion of the slider means includes part of one almost spherical surface.

Abstract: A magnetic head comprises a substrate, a soft magnetic thin film, whose magnetic permeability varies according to the intensity of an external magnetic field applied thereto, formed over the surface of the substrate, means for supplying a high-frequency current to the soft magnetic thin film, and means for applying a bias magnetic field to the soft magnetic thin film. The magnetic permeability of the soft magnetic thin film varies according to the variation of the intensity of the external magnetic field and hence the potential difference between the opposite ends of the soft magnetic thin film with respect to the direction of flow of the high-frequency current varies accordingly. The variation of the potential difference is detected for magnetic signal reading. The soft magnetic thin film is formed of a material having a large magnetic permeability, such as amorphous CO.sub.75 Ta.sub.11 Zr.sub.14.

Abstract: In a recorder/reproducer apparatus, a scanning magnetic transducer for the magnetic recording and reproducing of a data signal in a magnetic storage medium. The transducer includes one or more elongate main pole segments embedded in the periphery of a rotary drum and oriented at an angle relative to the drum's axis of rotation. An elongate stationary pole with an electromagnetic winding coupled to the data signal is spaced from the drum and oriented generally parallel to the axis of rotation. A magnetic tape is transported between the two poles in contact with the main pole segments on the drum and spaced from the stationary pole. Rotation of the drum during recording and/or playback causes the area of intersection, that is, the opposed common area or confronting face portions, of the stationary pole and each of the successive main pole segments to be moved or scanned along the face of the stationary pole.

Abstract: Process for fabricating a thin film head for high track density recording defines an easy axis parallel to the track in the narrow poletip without a need of a very high magnetic field in the plating cell. Narrow poletips of equal widths of P1 and P2 are obtained. The process includes sheet depositing a magnetic layer, then depositing a sheet of gap material, and then depositing a sheet of another magnetic layer. This operation can be done either by a vacuum technique or by an electroplating process. If it is done by vacuum processing, all the three depositions can be done in one pumpdown. Since the sheet magnetic films are deposited, the demagnetizing field is very small, and a small orienting field is necessary unlike the large field required in the prior art.

Abstract: A magnetic multilayer film having magnetoresistance (MR) is prepared by depositing at least two magnetic thin films having different coercive forces while interposing a non-magnetic thin film therebetween. A first magnetic thin film having a lower coercive force has a squareness ratio SQ.sub.1 of 0.01-0.5, an anisotropic magnetic field Hk of 1-20 Oe, and a thickness t.sub.1, a second magnetic thin film having a higher coercive force has a squareness ratio SQ.sub.2 of 0.7-1.0 and a thickness t.sub.2 .ltoreq.t.sub.1, and the non-magnetic thin film has a thickness t.sub.3 .ltoreq.200 .ANG.. A first preferred form requires 4 .ANG..ltoreq.t.sub.2 <30 .ANG. and 6 .ANG..ltoreq.t.sub.1 .ltoreq.200 .ANG.. A second preferred form requires 4 .ANG..ltoreq.t.sub.2 <20 .ANG. and 10 .ANG..ltoreq.t.sub.1 <20 .ANG.. A third preferred form requires 4 .ANG..ltoreq.t.sub.2 <30 .ANG. and 6 .ANG..ltoreq.t.sub.1 .ltoreq.40 .ANG..

Abstract: A magnetic multilayer film having magnetoresistance (MR) is prepared by depositing at least two magnetic thin films having different coercive forces while interposing a non-magnetic thin film therebetween. A first magnetic thin film having a lower coercive force has a squareness ratio SQ.sub.1 and a thickness t.sub.1, a second magnetic thin film having a higher coercive force has a squareness ratio SQ.sub.2 and a thickness t.sub.2, and the non-magnetic thin film has a thickness t.sub.3. A first form of the invention requires 4 .ANG..ltoreq.t.sub.2 <30 .ANG., 20 .ANG.<t.sub.1 .ltoreq.200 .ANG., t.sub.1 >t.sub.2, t.sub.3 .ltoreq.200 .ANG., 0.7.ltoreq.SQ.sub.1 .ltoreq.1.0, and 0.1.ltoreq.SQ.sub.2 .ltoreq.0.8, thereby achieving a magnetic multilayer film which shows a great MR ratio of several percents under an external magnetic field of several Oe, an excellent rise across zero magnetic field and heat resistance. A second form of the invention requires 4 .ANG.<t.sub.2 <20 .ANG., 5 .ANG.<t.sub.

Abstract: A thin magnetic head is formed by a magnetic substrate, an element portion, a protective plate, and the like. A plurality of external connection terminals are arranged on the surface of the magnetic substrate to extend from the element portion. A plurality of lead terminals are arranged in correspondence to respective ones of the external connection terminals. The lead terminals are held between a base film and a cover film or by a glass substrate, so that at least surfaces being opposed to the external connection terminals are exposed. Conductive layers are interposed between the opposed ones of the lead terminals and the external connection terminals respectively. The lead terminals are electrically connected with the external connection terminals by the conductive layer.

Abstract: The fabrication of thin film inductors on a substrate, which may include thin film resistors, thin film capacitors, and semiconductor devices. In one embodiment an inductor is fabricated initially on a substrate and then integrated with other devices subsequently formed on the substrate. In this embodiment, process steps used to fabricate such other devices utilize temperatures sufficiently low to prevent damaging or destroying the characteristics of the inductor. In another embodiment the fabrication of an inductor is achieved through photoresist masking and plating techniques. In alternative embodiments, fabrication of an inductor is achieved by sputtering, photoresist processes and etching/ion-milling techniques. A combination of various individual process steps from various embodiments are suitable for use to fabricate the individual layers to achieve a structure of this invention.

Abstract: A material for a magnetic head slider consists essentially of 0.1 to 20.0 vol % of at least one of oxides the group Va elements of the International Periodic Table (Ta, Nb, V) and 80.0 to 99.9 vol % of stabilized cubic ZrO.sub.2 containing a stabilizer (Y.sub.2 O.sub.3, MgO, CeO.sub.2). It has improved precision machinability, machining efficiency, high strength, densified structure, affinity with the recording medium or lubricity, besides wear resistance. It may be machined precisely into a thin film magnetic head slider with a reduced amount of chipping.

Abstract: A magnetic recording system for recording information on a magnetic recording medium magnetized with a perpendicular magnetization component by a magnetic recording head so as to be reproduced by a magnetic reproducing head, the magnetic recording head including a leading side and a trailing side opposite to the leading side, the leading side leading the trailing side in terms of motion relative to the magnetic recording medium, the magnetic recording head generating a first magnetic field with a field strength from the leading side to the magnetic recording medium, and generating a second magnetic field from the trailing side to the magnetic recording medium, a field strength of the second magnetic field being smaller than that of the first magnetic field.

Abstract: The spacing between a magnetic disk surface and a magnetic head tends to greatly decrease with an increasing request for higher density records. Measuring and controlling the small spacing is important for stabilized recording or reading. A substrate is attached to a side of a support which supports the magnetic head. Light is irradiated onto a surface of the substrate and totally reflected thereby. The small spacing is measured by measuring the quantity of the totally reflected light. An actuator is controlled such that the measured small spacing is maintained at a target value to thereby realize constant small-spacing control.

Abstract: A distributed-constant circuit type magnetic field detector which includes a magnetic member whose permeability varies with changes in a magnetic field applied thereto disposed at a point where a magnetic field is produced in a distributed-constant circuit excited with an electromagnetic wave and a detector for detecting a change in electromagnetic field distribution in the distributed-constant circuit produced by a variation in permeability of the magnetic member upon application thereto of a magnetic field to be detected.

Abstract: A magnetic material is provided which includes a discrete phase including grains made of a first substance which comprises a magnetic metal; and a continuous phase including a thin coating film made of a second substance which comprises a dielectric or insulating substance. The thin coating film is formed on the surface of the grains and has a mean thickness smaller than the mean particle size of the grains. The grains are separated substantially from each other by the thin coating film.

Abstract: Copolymers of perfluoro(1,3-dimethyl-2,2-dioxole) with perfluoro(butenyl vinyl ether) and, optionally, with a third comonomer are amorphous in all monomer proportions, and soluble in perfluoro(2-butyl tetrahydrofuran). These copolymers are suitable in many high technology applications, especially where solubility is important, e.g., in applying coatings to substrates or articles for protection against mechanical, chemical, or environmental hazards. Dipolymers of the present invention have lower glass transition temperatures than dipolymers of perfluoro(1,3-dimethyl-2,2-dioxole) with tetrafluoroethylene having the same monomer proportions.

Abstract: A magnetic recording and reproducing head records a signal from and reproduces a signal from a magnetic recording medium having a perpendicularly magnetizable film. The magnetic recording and reproducing head includes a magnetic sensing section comprising a slender needle of a soft magnetic material, and an exciting coil wound around the slender needle for magnetizing the slender needle to record a signal on the magnetic recording medium. To reproduced the recorded signal, high-frequency electric energy is applied to the magnetic sensing section to produce a reflected wave, and a change in the reflected wave caused by a leakage magnetic field produced by a signal recorded on the magnetic recording medium is detected as representing the recorded signal.

Abstract: An optical head for information recording and/or reproduction has a light source, a deflecting mirror, an adjusting mechanism and an objective lens. A light beam generated by the light source is deflected by the deflecting mirror to be directed to a recording and/or reproducing surface of a recording medium while adjusting the position of the deflecting mirror by the adjusting mechanism. The light beam deflected by the deflecting mirror is converged on the recording and/or reproducing surface of the recording medium by the objective lens.

Abstract: A magnetic head has a core body for defining a magnetic path, a pair of magnetic thin films deposited on a pair of opposing surfaces of the core body, a gap member deposited between the pair of opposing surfaces to define a magnetic gap, and a bonding member such as a glass disposed between the pair of magnetic thin films, thereby bonding the magnetic thin films. The angle between the surface on which the magnetic thin film is deposited and one side surface of the core body is made greater than in conventional magnetic heads. The bonding member directly bonds the pair of opposing surfaces of the core body to each other and not through the magnetic thin films.

Abstract: An integral head module having read and write elements positioned in an alternating relationship. A first pole piece of the integrated head module is formed with recesses into which are positioned write coils of write elements in order to provide write gaps of a greater length than the gaps of the MR read elements which are positioned on non-recessed portions of the first pole piece. The second pole piece is then affixed to the first pole piece together with a required insulating layer in order to form gaps of a first and increased length for the write elements and of a second and shorter length for the MR read elements.

Abstract: A magnetic head usable in a reader-writer for reading and writing data which can be magnetically processed. The magnetic head is characterized in that: it comprises a core (1), an exciting coil (2) for exciting the core (1), and a head case (3) for tightly enclosing the core (1) and the exciting coil (2); and a fuse is provided in a part of the exciting coil (2). When the reader-writer in which the magnetic head is incorporated is to be abandoned, the magnetic head can be easily destroyed, thereby enabling the prevention of fraudulent uses, such as the forging, of magnetic cards.

Abstract: An MR read head in which increased sensitivity is achieved by a flux path that enables an increased amount of flux that enters the MR element at its top edge on a read operation to pass through the entirety of the MR read element. This improved path is achieved by forming an extension area on the bottom inner edge of the MR read element. The extension extends through an aperture in an insulator layer to a first magnetic pole piece. This extension provides a low-impedance path that permits a higher percentage of the flux entering the MR element at its top portion to travel through the entirety of the MR element and thereby generates an increased signal output per unit of detected flux.

Abstract: A thin film magnetic read/write head is manufactured using a multi-layered sacrificial mask in a pole tip alignment process. The sacrificial mask includes a layer of metal deposited upon the magnetic upper pole tip. Subsequent sacrificial mask layers include nickel-iron alloy or photoresist. Following an ion milling alignment process, residual sacrificial mask layers are removed using a process in which the medal layer is selectively chemically etched away from the thin film magnetic head.

Abstract: A servo head in a disk file data storage system includes at least one shield which acts to block radiation emanating from a nearby data head and thus reduce noise induced in the servo head. The shield is located on either side of an essentially flat conducting coil in a servo transducer, or a data transducer or both. The shield may be either a single layer of material or multiple layers.

Abstract: A horizontal magnetic reading head for a perpendicular recording on a magnetic tape.A magnetic layer (50,51,52) is interrupted by two spacers arranged symmetrically with respect to the plane of a monopole (56). A U-shaped magnetoresistant element is constituted by two ribbons (34,35) parallel to the monopole and respectively located in the two spacers of the magnetic layer. The two ribbons are joined by a magnetoresistant bridge (36). Optionally, the head can have a conductor coil so that it could write in addition to read.

Abstract: The present invention relates to the improvement of corrosion wear resistance of iron-manganese (FeMn) film by ion implantation and subsequent annealing without substantially affecting the magnetic properties of the magnetic material. A highly corrosive and wear resistant FeMn film is disclosed comprised of a layer of FeMn and at least one protective layer selected from the group consisting of nitrides, carbides and oxides, with said protective layer being formed at the surface of the FeMn layer.

Abstract: An MR head includes two substantially identical MR elements, separated by a thin film non-magnetic electrically conductive spacer. A current applied to the MR head splits into two respective substantially equal currents that flow in the same direction through the substantially identical MR elements, to provide mutual bias and to serve as sense currents for detecting change in element resistance. The MR elements are biased to operate in a magnetically unsaturated mode. This results in a "bootstrapping" of short wavelength signals that effectively amplifies the reproduced signal over a broad region of the signal spectrum when the linear spacing between the MR elements is in the range of from one half to one times the half-wavelength of signals recorded on a magnetic recording medium.

Abstract: The magnetic medium includes a magnetic under image layer which may be separated from the hard magnetic recording layer by a nonmagnetic buffer layer. Virtual magnetic images induced in the magnetic image layer reduce off-track magnetization seen by the recording head. Thus, interference caused by tracks adjacent to the track being read is reduced.

Abstract: An improved composite head assembly is achieved by using bonding glass to fasten the back leg of the core to an air-bearing slider. The improved bonding of the present invention results in improved rigidity of the head assembly and virtually eliminates tail draggers associated with the prior art.

Abstract: A multi-track magnetic head having at least three conversion elements deposited on a common substrate includes a medium sliding face which is formed in a curved shape. The positions of at least two of the three conversion elements are shifted from each other perpendicularly to the alignment direction of the conversion elements in conformity to the curvature of the medium sliding face.

Abstract: A thin film magnetic read/write head is manufactured using a multi-layered sacrificial mask in a pole tip alignment process. The sacrificial mask includes a layer of metal deposited upon the magnetic upper pole tip. Subsequent sacrificial mask layers include nickel-iron alloy or photoresist. Following an ion milling alignment process, residual sacrificial mask layers are removed using a process in which the medal layer is selectively chemically etched away from the thin film magnetic head.

Abstract: A thin film magnetic head, having a predetermined cut-off frequency is constructed of alternating first and second layers, the first layers include a magnetic material and the second layers include a resistive material. The resistivity of the second layers is chosen so that the head's cut-off frequency exceeds the head's required frequency response. The resistivity of the second layers is chosen to be considerably less than any level of resistivity which falls within the insulation regime.

Abstract: A method and circuitry are described for sensing the clearance between a magnetic transducer and a moving magnetic recording medium in a magnetic disk or tape storage system or alternatively sensing the degree of magnetic instability of a magnetic transducer in such a system. Magnetic transitions prewritten on a preselected area of the medium are read to obtain a readback signal. The width of said signal is sensed at a predetermined amplitude level which is a preselected percentage of its base-to-peak amplitude to provide a voltage corresponding to the width of said signal at said level. The voltage is proportional to the width of the readback signal divided by the time period between successive transitions of identical polarity, so as to provide a measurement of clearance of degree of magnetic instability that is independent of the relative velocity between said transducer and medium.The voltage is digitized and compared to a prestored digital reference value.

Abstract: A thin film magnetic head consisting of a slider, and a read/write element attached to an end surface of the slider. The element is disposed between the top and bottom surfaces of the slider, on a longitudinal end surface of the slider. The top surface of the thin film magnetic head has an uppermost portion which is flat and narrower than the bottom surface.

Abstract: In a thin film magnetic head having a multilayer structure, a plurality of coil conductive layers are piled up to be formed between a lower magnetic layer and an upper magnetic layer. Each coil conductive layer is formed by one spiral-wound coil. The number of turns of the coil of the upper-side coil conductive layer is set smaller than that of the coil of the lower-side coil conductive layer. These coils are connected together such that first and second portions of the connected coils are respectively connected to a center terminal which is provided at the middle position of the connected coils. Thus, the number of turns of the first portion of the connected coils is set identical to that of the second portion of the connected coils. In addition, the winding direction of the first portion is set reverse to that of the second portion. Such coil conductive layers are surrounded by and buried in an insulation layer formed between the lower magnetic layer and upper magnetic layer.

Abstract: The present device provides a downstream magnetic shield which is integrally formed with a write pole section having a tip to make up a magnetic recording head. The shield and the write pole tip are located with small gap therebetween, so that magnetic flux which fringes from the magnetic write pole tip is intercepted by the shield. Accordingly such fringing flux does not pass through the recording medium, and hence if a data bit has been written into the recording medium its dipole identity will not be weakened by the fringing flux of a subsequent data bit being written into the magnetic recording medium. In addition, the magnetic recording medium is made up of a first layer of material having perpendicular uniaxial anisotropy and an underlying layer made of a material which has a low magnetic flux reluctance characteristic.

Abstract: A thin film magnetic head for performing recording and readout operations to a magnetic recording medium and a method of manufacturing the head. The magnetic head .[.comprises.]. .Iadd.includes .Iaddend.a substrate, a first magnetic layer formed on the substrate, a conductor coil on the first layer and a second magnetic layer formed on the conductor coil and the first magnetic layer. The second magnetic layer is imparted with a greater thickness than the first magnetic layer to thereby strengthen the magnetic field for recording and reducing the peak shift making appearance in readout operation due to interference between successively read-out waveforms. The thin film magnetic head exhibits an improved reproduction characteristic which permits reproduction with high fidelity the magnetized locations recorded on the medium with high recording density which assures an improved recording characteristic. .Iadd.