Abstract: A transformer device includes primary, secondary, and auxiliary windings, located in an insulating substrate by conductive vias joined together by conductive traces. Positions of the conductive vias are arranged so as to optimize the isolation properties of the transformer, and to improve the coupling of the transformer by increasing the leakage inductance and reducing the distributed capacitance. The transformer device is compact and is weakly coupled. The weak coupling between the windings reduces the likelihood of the transformer malfunctioning, particularly when used in a self-resonant converter circuit.

Abstract: In one embodiment, a computer program product includes a computer readable storage medium having program instructions embodied therewith, the program instructions readable/executable by a controller to cause the controller to: determine and/or receive, by the controller, a selection of which of at least two track width formats to use during writing of data on a magnetic recording tape, wherein the track width format is selected based on an environmental condition; and cause, by the controller, simultaneous writing of a plurality of data tracks to the magnetic recording tape using only one of the track width formats at a same time such that each of the data tracks written at the same time has a track width that is substantially the same.

Abstract: A magnetic storage system includes a magnetic storage medium comprising a keeper layer of relatively low permeability soft magnetic material deposited upon a magnetic storage layer or between multiple magnetic storage layers. The low permeability keeper layer may be disposed either above or below the magnetic storage layer. In the unsaturated state, the keeper layer acts as a shunt path for flux emanating from recorded transitions on the magnetic storage layer, producing an image field of the recorded transitions in the keeper. This shunt path prevents signal flux emanating from the recorded transitions from reaching the head. To read data from a recorded transition on the magnetic storage layer; a bias current is applied to windings of the head, creating a bias flux which saturates a portion of the keeper layer. Once saturated, this portion of the keeper can no longer shunt flux emanating from the recorded transition, which is the region represented by the head reproduce transducer.

Abstract: A tape-type magnetic recording medium is disclosed which is adaptable to a yoke-type magnetoresistance effect magnetic head and with which a dense recording operation can be performed and a signal reproducing method is disclosed for reproducing a signal recorded on the tape-type magnetic recording medium. The tape-type magnetic recording medium has a magnetic layer formed on a non-magnetic support member, wherein when an assumption is made that residual magnetic flux density of the tape-type magnetic recording medium is Br, the thickness of the magnetic layer is .delta., the saturation magnetic flux density of a magnetoresistance effect device of a yoke-type magnetoresistance effect magnetic head serving as a reproducing head is Bs and the thickness of the magnetoresistance effect device is t, the following relationship is satisfied:Bst/2.ltoreq.Br.delta..ltoreq.Bstand coercive force Hc of the tape-type magnetic recording medium satisfies Hc.gtoreq.1500 (Oe).

Abstract: This magnetic head essentially has at least one excitation conductor located below two layers made of magnetic material constituting the magnetic poles of the head and separated by a gap. The positioning of the conductor is such that it forms an angle different from 0.degree. or 90.degree. with respect to the direction of the gap. Different embodiments of the invention are provided for, notably with several conductors to set up a matrix-type control. Application to write/read magnetic heads.

Abstract: Disclosed is a recording and/or reading device with magnetic heads including at least two magnetic heads. A magnetic circuit for the closing of the magnetic flux has a pad common to both heads. A first pole of a first type magnetically couples the common pad to the gap of the first head through a non-magnetic link. A second pole of a second type, separated from the first pole by a non-magnetic interval, magnetically couples the common pad to the gap of the second head. Such a device finds applications to a system for recording and/or reading, notably on magnetic tapes.

Abstract: A magnetic storage system is disclosed that includes a magnetic storage layer associated with a soft magnetic saturable keeper layer. A transducer is spaced from the storage layer and the keeper layer in flying relationship thereto, with an MR element contained therein to provide high sensitivity detection along with the reduced spacing loss available from the keepered storage layer.

Abstract: A magnetic storage medium comprises a keeper layer of soft magnetic, saturable material disposed upon a magnetic storage layer. The keeper layer is disposed above the magnetic storage layer, and a non-magnetic "break" layer may be used between the keeper and the storage layer to reduce the exchange coupling between these layers. To increase the ability of the keeper layer to shunt flux from the magnetic storage layer, a longitudinal anisotropy is induced in the keeper layer. This establishes a desired magnetic orientation of the keeper which facilitates maintaining the regularity (i.e., relative uniformity) of the transitions, and reducing the magnetic interaction between transitions as the spacing between transitions is reduced to provide denser media. Specifically, the longitudinal anisotropy may be oriented either circumferentially or radially relative to the plane of rotation of the magnetic storage layer.

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: The magnetic recording head of the invention comprises an electrical conductor constituted by the poles themselves or by a magnetic shunt, which gets saturated when an electrical current is sent to it. It is thus possible to control the field at the gap and control the recording by this electrical current which acts by inhibition or validation of the writing, respectively.

Abstract: In a magnetic recording device for magnetically recording Information on a magnetic recording medium by a magnetic head, the magnetic head is so oriented that the magnetic flux leaking at the head gap is at right angles with the direction of relative movement between the magnetic head and the magnetic recording medium and parallel with the surface of the magnet recording medium. The magnetic recording medium may have track portions formed of a magnetic material, and intertrack portions formed of a nonmagnetic material. The magnetic recording medium may alternatively be formed of convex track portions and concave intertrack portions.

Abstract: A magnetic reading device, of the type comprising multiple magnetic read heads, incorporates read heads each formed by a magneto-resistance element having a resistance which varies as a function of an outside magnetic field. The magnetic reading device comprises a network of line conductors intersected with a network of column conductors to form intersections at which a read head is provided. The first and second ends of each magneto-resistance element forming the read heads are respectively connected to a line conductor and to a column conductor of the corresponding intersection, and a control voltage is applied to the line and column conductors by a switching element for each line conductor, column conductors being connected to a current sensor. A simplification of the control of read heads results from this arrangement, while avoiding the effect of the heads not selected on the variations of current coming from the selected heads.

Abstract: A preferred embodiment of an electromagnetically controlled scanning magnetic transducer is described having two confronting core poles defining a physical transducing gap therebetween. A control winding is associated with each core pole. A control current applied to each control winding selectively saturates a portion of each core pole facing a record medium. Each saturated face portion defines an adjacent unsaturated highly permeable face portion. The highly permeable face portions of each core pole overlap across the gap to define a transducing zone. The information signal and control windings are arranged relative to one another to obtain information signal and control flux paths extending perpendicular to one another.

Abstract: A magnetic transducer has a transducing gap that is wider than that used for transferring information signals with respect to a magnetic record medium. A magnetic control flux is applied to the transducer to enable a selected segment of the transducing gap, which defines a transducing zone, for transferring information signals with respect to a selected path along the magnetic record medium. Registration of the transducing zone over the selected path is maintained by varying the applied magnetic control flux to thereby move the transducing zone along the wider transducing gap so as to compensate for deviations between the path traced by the transducing zone over the magnetic record medium and the selected path.

Abstract: Apparatus is described for coupling magnetic flux defining information between a first body of magnetic material and a second body of magnetic material having a magnetic flux path therein. A third body of magnetic material having a transducing zone is included and disposed to be magnetically proximate the first body of magnetic material to couple flux to or from the same, and to have a portion thereof magnetically proximate the magnetic flux path within the second body of magnetic material to provided coupling of flux to or from such flux path. In specific embodiments described, the first body of magnetic material is a magnetic storage medium such as a layer of hard magnetic material of a tape, and the second body of material is a transducer core of a soft magnetic material.

Abstract: A magnetic transducer arrangement includes a core with a gap and a body of magnetically anisotropic material in which a signal transfer region is defined. Control flux flows across the gap of the core and through the body in opposite directions. The two oppositely directed flux flows influence one another and tend to cancel each other to define a null zone. This null zone, in which the flow of control flux is very low, is sensitive to flux emanating from an adjacent magnetic storage medium and therefore defines the signal transfer region. By varying the relative proportions of control flux flowing in the opposite directions, the location of the null zone can be varied along the width of the magnetic transducer to thereby scan the signal transfer region. The flux which is coupled from the magnetic storage medium into the null zone of the body does not flow through the magnetic core in a manner similar to a fringing flux.

Abstract: An electromagnetically controlled scanning magnetic transducer has two magnetic core portions with confronting poles defining a transducing gap. A control winding is arranged in each core portion to provide a control flux therein. The control flux saturates a region of the transducer face of each core portion, adjacent to the gap. The saturated regions define adjacent unsaturated highly permeable regions which overlap at the gap to obtain a transducing zone. The transducing zone can be altered, moved, scanned or otherwise positioned along the transducer width by electromagnetically controlling the location and size of the saturated face regions.

Abstract: The disclosed static reading head includes a dense network of micro-heads. Each of these micro-heads has a magnetic circuit body made of ferrite, closed by the tape to be read through narrow Permalloy pieces. The micro-heads are associated with lines of excitation wires supplied with DC current with a high-frequency component, and columns of reading wires connected to detection circuits.

Abstract: The thermo-magnetic head disclosed has a gap with magnetic properties at ambient temperature. This gap is heated above its Curie temperature in order to make it lose its magnetic property. The pole pieces on either side of the gap form electrical conductors which convey the heating current of this gap.

Abstract: An information storage device includes a magnetic recording medium, preferably supported upon a rotating disk, an electromagnetic writing device that writes magnetic patterns into the recording medium, and a superconducting quantum interference device (SQUID) that reads the magnetic patterns in the recording medium, the writing device and the SQUID preferably being mounted upon a read/write head. The SQUID as operated in its superconducting state is a highly sensitive and directional detector of the magnetic state of the recording medium, permitting it to be spaced relatively distantly from the recording medium yet read the state of small areas of the medium. Use of high temperature superconductors in the SQUID permits practical construction of the information storage device. The read/write head may support a plurality of write devices, and an array of SQUIDs can be utilized so that little or no relative movement of the read/write head is required to read and write from all tracks of the disk.

Abstract: Magnetic transducer-keeper combination embodiments of the invention are described. Each has a magnetic core defining a physical gap and a thin magnetic keeper arranged in close proximity of the core to bridge the gap. A magnetic flux from the gap saturates the keeper inan area bridging the gap, thereby forming a signal transducing zone in the keeper. The keeper is maintained stationary and the core moved or scanned with respect to the same, thereby moving or scanning the transducing zone in the keeper.

Abstract: A magnetic head device is disclosed which comprises: a head tip including a pair of cores which are confronted with each other in such a manner that the cores are sufficiently spaced away from each other with a magnetic gap fored at one end; a bridge core bridging the pair of cores to allow a magnetic flux to flow out of one of the pair of cores and flow in the other core; and a coil placed in the path of the magnetic flux.

Abstract: A magnetic head device is disclosed which comprises: a head tip including a pair of cores which are confronted with each other in such a manner that the cores are sufficiently spaced away from each other with a magnetic gap fored at one end; a bridge core bridging the pair of cores to allow a magnetic flux to flow out of one of the pair of cores and flow in the other core; and a coil placed in the path of the magnetic flux.

Abstract: A multitrack magneto-resistive head is comprised of an array of thin-film yoke-type core structures. In the back gap of each such core structure, there is a sense-current-carrying magneto-resistive flux responsive element. To prevent excessive sense current flow, and insensitivity as caused thereby, the invention teaches that slotting of the magneto-resistive element in the region thereof where such element connects into such back gap will alleviate both such problems.

Abstract: A magnetostrictive record and playback head is disclosed which utilizes an acoustic wave traveling along the surface of piezoelectric material so as to distort the surface thereof and to change the stress in a layer of magnetostrictive material along that surface at a point which depends upon the position of the traveling acoustic wave. At the point where the magnetostrictive material is changed, the material is magnetic so that a pulse in an adjacent conductor will cause a flux to form that can deposit a magnetic signal on adjacent magnetic tape.

Abstract: A read head for a Wiegand Wire has a low reluctance core on which a pick-up coil is wound. The Wiegand Wires are passed over a face of the core and coil and switch state directly over the core and coil so that the change in the magnetic field is coupled to the coil to produce an output pulse. Outboard of the direction in which the Wiegand Wires travels are first and second magnets that generate the field. In contact with these magnets and bridging both sides of the coil are first and second magnetic shunt members which control and determine the shape of the field. A first magnetic shunt member has a relatively narrow bridge portion which saturates under the field involved and thus there is a large leakage field adjacent to the face of the read head for the purpose of appropriately setting the Wiegand Wires. The second shunt has a much larger bridge portion so that there is much less leakage flux. However this smaller leakage flux is in the opposite direction from the leakage flux from the first shunt.

Abstract: An MR sensor is disclosed in which a pair of thin film magnetoresistive strips are connected electrically in parallel between two terminals. Strips are spaced apart a distance which is small relative to the density of the stored data to be sensed. The strips are mutually-biased in opposite directions to corresponding points in the linear region of their respective curves by current from a constant source attached to one terminal. Since the resistance of each strip is equal, the current divides equally between the strips.The sensor is positioned adjacent the magnetic surface containing stored data. Vertical components of the magnetic field (preferably vertically recorded data) influence the resistance of the strips differentially. When the sensor encounters a vertical flux transition, the output voltage varies to produce a unimodal type pulse.

Abstract: A magnetic head has an array of cores the transducer gaps of which are aligned in a row. Each core--unlike most prior art cores--has a high reluctance back gap; and bridging the back gap of all such cores is a common magnetic wire. Pursuant to the invention, a domain wall is created in the film on the magnetic wire; and such domain wall is thereafter caused to propagate along the length of the wire. Whenever the domain wall resides in the back gap of a given core in the array of cores, that back gap has low reluctance, thereby turning ON the core in question. All other cores remain OFF until the propagating domain wall resides at their respective back gaps.

Abstract: A gapped magnetic core is comprised of core material of one type. Gapping material, which is magnetically different from the core material, "completely" bridges the core gap. The gapping material has a lower magnetic saturation level than does the core material; and thus the gap cannot act as a transducer gap until it becomes magnetically saturated. When gapped cores as described above are stacked to form a multitrack head, the effects of inductive coupling between the cores is prevented; i.e., when, for example, one core of the stack of cores is actuated by magnetically saturating its gap, all other cores of the stack are inherently immune to inductive coupling to the actuated core. This is because induced flux in all non-actuated cores is magnetically short-circuited through their respective magnetic gaps.

Abstract: A process for generating a magnetic induction field within a magnetic medium. A magnetic energizing field and a selection wave are caused to act at the same time at each point on a path of at least one unsaturated portion of the magnetic medium, in such manner as to modify the magnetic properties of the medium at this point and so as to produce therein the said induction field. The process is applicable to devices for generating a magnetic field utilized in magnetic data recording systems.

Abstract: A magnetic record and/or reproduce head, comprised of electrically conductive magnetic core material, has an electrically conductive transducer gap having a magnetic gap length of less than about 15 microinches. The head is selectively actuable by passing a current through the core material via the gap.

Abstract: A process for generating a magnetic induction field within a magnetic medium. A magnetic excitation field and a selection wave are caused to act simultaneously at each point on a path of at least one non-saturated portion of the magnetic medium, in such manner as to modify the magnetic properties of the medium at this point by degrading them and thus producing therein the induction field. The process is applicable to devices for generating a magnetic field utilized in magnetic data recording systems, wherein the magnetic medium is of a "degraded type".

Abstract: Magnetic transducing heads are disclosed which include two stacks of ferromagnetic laminations. Each lamination in one stack is paired with a lamination in the other stack. At their closest point each pair of laminations defines a transducing gap. The stacks are so positioned that the transducing gaps form a linear array. The tops of the two stacks of laminations are so configured as to lie in a common cylindrical surface, the axis of the common cylindrical surface being perpendicular to the rectilinear array of transducing gaps, though not intersecting it. A cylindrical rotor is rotatably mounted so that its surface is very close to the cylindrical top surfaces of the two stacks. Four low reluctance bridging elements are mounted in the rotor and at or near its cylindrical surface. An exciting winding surrounds one stack of laminations.

Abstract: A thin film magnetoresistive sensor of NiFeCo is juxtaposed with a saturable thin film shield of more highly permeable NiFe material. The curve depicting change of resistance of the sensor as a function of applied magnetic field is flattened, permitting the sensor to provide a magnetic switch, such as a keyboard transducer, a sensor of current through wires, a magnetic bubble detector and a remote control scanning sensor in a recording head. The scanner involves a stepped arrangement for providing different levels of sensitivity for adjacent sections of the magnetoresistive sensor.