Abstract: A magnetic head apparatus including a magnetic head slider having an overall front half region area (S) and a step surface area (S1) and a positive-pressure generating surface area (S2) both in the front half region, such that the area ratio S1/S is about 0.180 to about 0.232 and the area ratio S1/S2 is about 0.30 to about 0.47. With this arrangement a difference in pitch angles of the magnetic head slider at the moment when it is just levitated and during levitation is large, and a variation of the pitch angle due to a pressure change is small, thereby preventing damage to a magnetic element within the magnetic head slider while achieving a stable levitation attitude of the magnetic head slider.

Abstract: A magnetic head apparatus including a magnetic head slider having an overall front half region area (S) and a step surface area (S1) and a positive-pressure generating surface area (S2) both in the front half region, such that the area ratio S1/S is about 0.180 to about 0.232 and the area ratio S1/S2 is about 0.30 to about 0.47. With this arrangement a difference in pitch angles of the magnetic head slider at the moment when it is just levitated and during levitation is large, and a variation of the pitch angle due to a pressure change is small, thereby preventing damage to a magnetic element within the magnetic head slider while achieving a stable levitation attitude of the magnetic head slider.

Abstract: For the purpose of obtaining better flexibility in a case where a flexible cable is used for the wiring of a head main body of a floating type magnetic head than the flexibility obtained in a case where a copper wire is used for the same to maintain satisfactory degree of freedom of the head main body, the equation shown below shall be satisfied:W/L.ltoreq.-15(A.times.Dc+Dp)+0.5whereW=width of a band-shaped portion to be a bending portion of a flexible cable to be used for the wiring of the head main body,L=length of the band-shaped portion,Dp=thickness of the cable base material of the above portion,Dc=thickness of the conductor layer of the above portion,A=area ratio of the conductor layer to the cable base material.

Abstract: An object of the present invention is to provide a thin-film magnetic head device capable of magnetically writing magnetic signals into a magnetic recording medium having a high coercive force and reading the same therefrom. At least one of upper and lower magnetic layers is composed of a main magnetic layer and a sub magnetic layer. The sub magnetic layer has a saturation magnetic flux density of 1.5T or greater, a magnetic permeability of 1000 or less and an anisotropic magnetic field of 10 Oe or greater. The thickness of the sub magnetic layer should preferably be 0.5 .mu.m or less. According to the present invention, the sub magnetic layer can obtain a high saturation magnetic flux density and the main magnetic layer can attain a high magnetic permeability. With a thickness of 0.5 .mu.m or less, the sub magnetic layer can obtain a high saturation magnetic flux density without reducing the magnetic permeability.

Abstract: According to the invention, there is provided a laminar magnetic head having bonding pads formed in so many layers and laminated with laminar component devices and circuits so that the surface areas of the bonding pads can be significantly enlarged without altering the arrangement of the lower layers of devices and circuits. Such a design ensures miniaturization and realization of a complex structure of a magnetic head as well as an enhancement of the workability and strength of the lead wires of the head for connection with by simply altering the patter of arrangement of the bonding pads and without significantly altering the production process that can involve a rise of manufacturing cost.

Abstract: A main pole exciting type magnetic head for vertical magnetic recording, including a lower slider formed of a magnetic material, a winding core formed of a magnetic material, a substrate formed of a non-magnetic material and disposed so that one end face thereof is positioned on an upper surface of the winding core, a main pole film formed on one end face of the substrate, and an upper slider formed of a magnetic material, the upper slider being opposed to the lower slider through a vertical magnetic recording medium; as well as a method of producing such magnetic head.

Abstract: A thin film magnetic head for use in the vertical magnetic recording having a main magnetic pole for carrying out recording and reproduction on and from a recording medium, and an auxiliary magnetic pole for cooperating with the main magnetic pole to form a closed magnetic circuit wherein the dimension of the auxiliary magnetic pole is made larger than that of the main magnetic pole at its end facing the recording medium and in their tracking direction to enhance reproduction efficiency.

Abstract: A magnetic head for perpendicular magnetic recording is disclosed which is composed of a substrate made of a non-magnetic material, a main pole film formed on the side surface of the substrate, a protective film for covering the main pole film, a winding core on which the substrate is pasted such that the main pole film is situated above the winding core, and a slider to which the winding core is secured through an adhesive.

Abstract: A method of manufacturing a thin film magnetic head is disclosed. This method is characterized such that a protection film is formed on a substrate; only corresponding portions of the protection film to bonding pads are ground in a groove-like configuration before cutting out the thin film magnetic heads therefrom so that the bonding pads are exposed; and the substrate is cut to a predetermined size per thin film magnetic head. With this arrangement, it is feasible to prevent an upper magnetic layer from being damaged during the grinding operation.

Abstract: A magnetic head for vertical magnetic recording having a leg portion formed on a core on the recording and reproducing side, which leg portion is put in connection with the recording and reproducing magnetic thin film and a leg portion formed on a core on the erasing side, which leg portion is put in connection with the erasing magnetic thin film. A recording and reproducing coil is provided on the leg, or pillar, portion formed on the core on the recording and reproducing side and an erasing winding, or coil, is provided in a groove, or on a pillar portion, formed on the core on the erasing side.

Abstract: A magnetic head for perpendicular magnetic recording includes a pair of substrates consituted by a non-magnetic material and having their opposing surfaces respectively formed with heat-resistant polymer films. A thin magnetic film is retained between these substrates. Further, a non-magnetic intermediate film is interposed between the thin magnetic film and each of the polymer films. The intermediate film has a coefficient of thermal expansion which is close to that of the thin magnetic film. Accordingly, no internal stress is generated in the thin magnetic film which would otherwise be caused by thermal expansion and shrinkage in manufacture. Thus, it is possible for the magnetic head to possess sufficiently high wear resistance and excellent magnetic properties.

Abstract: A magnetic recording medium for perpendicular magnetization includes a base of a nonmagnetic material, and a magnetic layer having perpendicular magnetic anisotropy on at least a face side of the base, the magnetic layer being composed of cobalt as a main component with carbon added thereto.

Abstract: A cobalt-base ternary alloy containing small amounts of hafnium and tantalum formed by sputtering, vapor deposition, etc., is used as the principal magnetic pole of a magnetic head for perpendicular magnetic recording, the core thin layers of a thin layer magnetic recording head, or the magnetic shield thin layers of a thin layer magnetic reproducing head. The ternary amorphous alloy has a high permeability and a high saturation magnetic flux density and hence the thickness of the foregoing layers composed of the alloy can be reduced as thin as possible.

Abstract: A vertical recording magnetic head of a main pole magnetizing type is made of a magnetic core having a central leg and two side legs, while an electromagnetic coil is supported around the central leg for exciting the same. A non-magnetic member is secured to the magnetic core so as to cover the central leg and the two side legs, and a magnetic thin layer, which is operable as the main pole, is provided in the non-magnetic member at a position overlying the central leg of the magnetic core such that the thin layer extends vertically to a recording medium moved in contact with the non-magnetic member.

Abstract: A recording/reproducing apparatus is disclosed, characterized in that a sliding contact part coming into sliding contact with a magnetic recording medium is provided at the upstream side, as determined by the running direction of the magnetic recording medium, of a magnetic head core, and at least a portion of the sliding contact part coming into sliding contact with the magnetic recording medium is made of a composite material comprising a carbonaceous material and a mechanical strength-increasing material. This is applicable to a magnetic head, an erasing head, a pad for a magnetic head, and a running guide member.

Abstract: A magnetic recording medium for perpendicular magnetization includes a base of a nonmagnetic material, a first magnetic layer of a soft magnetic material on a surface of the base, a second magnetic layer having perpendicular anisotropy on a surface of the first magnetic layer, the second magnetic layer being magnetized in a transverse direction thereof. The second magnetic layer is composed of a three-element alloy of cobalt, chromium, and hafnium, cobalt being a main component with chromium and hafnium added thereto.

Abstract: A perpendicular magnetic recording medium composed of a base material, a 1st magnetic thin layer formed on the base material, and a perpendicularly magnetizable 2nd magnetic thin layer formed on the 1st magnetic thin layer, wherein the 1st magnetic thin layer is composed of a Co-base ternary amorphous alloy containing small amounts of Hf and Ta.

Abstract: A magnetic recording medium for perpendicular magnetization includes a base of a nonmagnetic material, a first magnetic layer of a soft magnetic material on a surface of the base, a second magnetic layer having perpendicular anisotropy on a surface of the first magnetic layer, the second magnetic layer being magnetized in a transverse direction thereof. The second magnetic layer is composed of a three-element alloy of cobalt, chromium, and tantalum, cobalt being a main component with chromium and tantalum added thereto.

Abstract: A composite material for use in the preparation of substrates for thin film magnetic heads is provided which comprises a carbonaceous or graphitic material strengthened with a resin or metallic binder and optionally impregnated with a resin, metallic or non-metallic impregnant.

Abstract: A soft magnetic material having a low coercive force and a high permeability without reduction in saturation magnetic flux density is composed of a Co-base Co-Hf-Ta amorphous alloy containing 1 to 5 atoms % Hf and 4 to 10 atoms % Ta. The amorphous alloy is prepared by sputtering, etc.