Abstract: In a magnetic recording and reproducing apparatus of a type wherein a magnetic disk having a magnetic recording layer formed on a rigid substrate is rotated at a high speed and magnetic recording and reproduction are conducted by the magnetic head disposed on the surface of the disk, the magnetic recording and reproducing apparatus being characterized in that the magnetic recording and reproducing are conducted by the magnetic head which is caused to fly from the magnetic disk at at least an area of the outermost cylinder of the magnetic disk and is caused to be substantially in contact with the surface of magnetic disk at at least an innermost cylinder of the magnetic disk.

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: A magnetic recording disk comprising a rigid substrate and a magnetic layer of the continuous thin film type is durable and exhibits good electromagnetic properties when the magnetic layer predominantly composed of .gamma.-Fe.sub.2 O.sub.3 has specific peak area ratios in an X-ray diffraction chart thereof. Inclusion of .alpha.-Fe.sub.2 O.sub.3 in the magnetic layer is also effective. Reliable recording/reproduction can be conducted on the magnetic recording disk using a flying magnetic head.

Abstract: A magnetic recording disk comprising a rigid substrate and a magnetic layer of the continuous thin film type is durable and exhibits good electromagnetic properties and frequency response when the magnetic layer is predominantly composed of .gamma.-Fe.sub.2 O.sub.3 and has a resistivity of 0.03 to 3 .OMEGA.-cm. Reliable recording/reproduction can be conducted on the magnetic recording disk using a flying magnetic head.

Abstract: In a magnetic recording and reproducing apparatus of a type wherein a magnetic disk having a magnetic recording layer formed on a rigid substrate is rotated at a high speed and magnetic recording and reproduction are conducted by the magnetic head disposed on the surface of the disk, the magnetic recording and reproducing apparatus being characterized in that the magnetic recording layer constitutes an oxide layer, a nitride layer or an oxidized coating film at at least its surface layer, and the magnetic recording and reproducing are conducted by the magnetic head which is caused to be substantially in contact with the surface of magnetic disk at at least the innermost cylinder of the magnetic disk.

Abstract: A magnetic head comprises a slider which holds recording/writing elements at its medium opposing surface constituting a lifting force generating part and the surface area of the medium opposing surface is at most 2 mm.sup.2.A magnetic recording and reproducing apparatus has such magnetic head which is disposed on a magnetic disk having a magnetic recording layer formed on a rigid substrate while the disk is rotated at a high speed so that magnetic recording and reproducing are conducted between the magnetic head and the magnetic disk, wherein the surface roughness R.sub.max of the magnetic disk is at most 100 .ANG..

Abstract: A magnetic recording and reproducing apparatus of a type wherein a magnetic disk having a magnetic recording layer formed on a rigid substrate is rotatable at a high speed and a magnetic head is disposed on the surface of the disk so that magnetic recording and reproduction are conducted by the head while rotating the disk at a high speed, wherein the surface roughness R.sub.max of the magnetic disk is adjusted at a level of at most 100 .ANG., and the flying height of the magnetic head at the initiation of flying is adjusted at a level within a range of from 0.01 to 0.04 .mu.m.

Abstract: A vertical recording system using a rigid disk medium with high recording density has a substrate made of alumina silicate resin glass and a vertical magnetic anisotropic film located on said substrate. Said anisotropic film has an easy axis of magnetization in the thickness direction of the film, and the hard axis of magnetization in the film plane. The maximum surface roughness R.sub.max of said disk is less than 50 .ANG., and a magnetic recording head which moves relative to the medium operates with said head contacted with the medium. A recording density higher than 200 KFRPI (kilo flux reversal per inch) is obtained by the present invention.

Abstract: A vertical recording system using a rigid disk medium with high recording density has a substrate made of alumina silicate resin glass and a vertical magnetic anisotropic film located on said substrate. The anisotropic film has an easy axis of magnetization in the thickness direction of the film, and the hard axis of magnetization in the film plane. The maximum surface roughness R.sub.max of said disk is less than 50 .ANG., and a magnetic recording head which moves relative to the medium operates with said head contacted with the medium. A recording density higher than 200 KFRPI (kilo flux reversal per inch) is obtained by the present invention.

Abstract: In a magnetic recording medium comprising a non-magnetic substrate and a magnetic thin film formed on the surface thereof and including at least two layers, the upper layer in the form of a crystalline cobalt-chromium alloy layer suitable for perpendicular magnetization is placed on the lower layer in the form of an amorphous layer of permalloy having high permeability and low coercive force.

Abstract: In a magnetic recording medium particularly for perpendicular magnetization comprising a non-magnetic substrate and a magnetic thin film formed on the surface thereof and including at least two layers, a lower layer with low coercive force and high permeability, for example, of permalloy is sputtered on the substrate and an upper layer for perpendicular recording, for example, of cobalt-chromium alloy is sputtered on the lower layer, and the average grain diameter of the lower layer is less than one half of that of the upper layer.

Abstract: A magnetic recording medium is coated, over its magnetic layer, with a thin film of a siloxane-linkage-containing polymer. The magnetic layer consists of a thin film formed by vacuum evaporation or sputtering or by dispersion of a ferromagnetic metal powder in a binder. The polymer having the siloxane linkage is prepared by polymerizing an organo-silicon compound which either inherently possesses the linkage or is capable of producing it. The polymerization is preferably effected by the plasma polymerization technique.

Abstract: A magnetic recording medium having a subbing metal layer formed by sputtering under a thin magnetic layer formed by vapor deposition possesses excellent magnetic properties and high surface hardness. The presence of the subbing layer improves the adhesion of the thin magnetic layer to the support.

Abstract: A magnetic recording medium having a Mn-Al recording layer containing at least one of Fe, Co, and Ni and having an easy magnetization axis in the perpendicular direction to the layer. The magnetic recording layer can be formed at a high speed by employing magnetron sputtering.

Abstract: A magnetic recording medium comprises a substrate and a thin magnetic metal layer formed on the substrate by a sputtering method and composed essentially of Mn, Al and Cu.

Abstract: A magnetic recording medium has a magnetic recording layer comprising from 75 to 90% by weight of Co and up to 5% by weight of Cr, the rest being V. The magnetic recording layer has an easy magnetization axis in the perpendicular direction to the layer surface. The magnetic recording medium is prepared by sputtering a composition of Co-V-Cr onto a substrate at an industrially feasible deposition speed of at least 3000 .ANG./min to form the above mentioned recording layer on the substrate.

Abstract: A magnetic recording medium comprises a substrate and a magnetic recording layer formed on the substrate and having an easy magnetization axis in the perpendicular direction to the surface of the medium, characterized in that said magnetic recording layer is composed of from 75 to 90% by weight of Co, at most 15% by weight of Mo and the rest being V and unavoidable impurities.

Abstract: A magnetic recording medium comprising a non-magnetic substrate having fine holes in a direction of thickness and a magnetic material filled in said fine holes. The fine holes have a diameter ranging from 200 A to 5000 A and a depth ranging from 2000 A to 5 .mu.m at a ratio of depth to diameter of 1 or more.

Abstract: A magnetic erasing head including a rear part on which an exciting coil is wound, side parts extended from the rear part, a front part on which two or more gaps are formed with each spacer made of a non-magnetic substance. An angle of one of the gaps is different from an angle of the other gap.

Abstract: Ferromagnetic metal or alloy particles are prepared by reducing ferromagnetic metal ions in the solution with a reducing agent under a magnetic field to obtain a slurry of ferromagnetic metal or alloy particles and adding an oxidizing agent to an aqueous slurry containing the ferromagnetic metal or alloy particles to prevent deterioration of magnetic characteristics.