Abstract: A first and a second magnetic layer are deposited on a substrate. The first magnetic layer has high magneto-optical effect at short wavelengths, but low perpendicular anisotropy. The second magnetic layer has low magneto-optical effect at short wavelengths, but high perpendicular anisotropy. The magnetic exchange coupling between the two magnetic layers results in a recording medium which has strong perpendicular anisotropy and high magneto-optical effect, even at short wavelengths.

Abstract: An amorphous magnetic alloy of Co-Nb-Zr system contains Co, Nb and Zr and has a composition which falls, in terms of atomic percent, within the region defined by straight lines connecting, in a ternary composition diagram assuming the total of contents of these three elements to be 100, a point (81% Co, 14% Nb, 5 Zr), a point (88% Co, 9% Nb, 3% Zr), a point (86.5% Co, 12.5% Nb, 1% Zr) and a point (81% Co, 18% Nb, 1% Zr). Disclosed also is a magnetic head having a core at least a part of which is constituted by this amorphous magnetic alloy. This magnetic head, when used in combination with a metal powder tape having a high coercive force, provides a remarkably increased recording-reproducing output.

Abstract: A process for fabricating a superconducting oxide thin film is disclosed which comprises the steps of separately evaporating metal elements, of which the superconducting oxide thin film with a desired stoichiometry is to be composed, to a substrate and simultaneously irradiating the substrate with oxygen plasma generated by RF wave or ECR microwave to form a crystalline oxide film without further annealing.

Abstract: A magneto-optical recording medium made of a rare-earth-transition metal amorphous film provides a compensation temperature Tcomp of 50.degree.-200.degree. C. or 0.degree. C. or less. This compensation temperature decreases a saturation magnetization Ms during recording, thereby preventing the provision of inverted magnetic domains at the centers of recording domains resulting from the demagnetizing field generated by the strength distribution of laser light, and so improving a carrier-to-noise ratio during reading. In the case of using a Tb-Fe-Co system amorphous film, Tcomp of 50.degree.-200.degree. C. may be give by the composition comprising Tb of 24-30 atomic %, Co of 7-20 atomic % and Fe of the rest, and Tcomp of 0.degree. C. or less may be given by the composition comprising Tb of 18-21.5 atomic %, Co of 8-10 atomic % and Fe of the rest.

Abstract: Disclosed is a magneto-optical recording material whose composition formula is indicated by (Co.sub.1-a M.sub.a).sub.100-y R.sub.y where M denotes at least one element selected from the group consisting of elements of the platinum group and Fe, Ni, Nb, Cu, Ag, Al, B, Si and Ge; R denotes either at least two elements selected from the group consisting of Tb, Sm, Gd, Dy, Ho and Y or a single element selected from the group consisting of Tb, Gd, Dy and Ho; the value a satisfies 0<a.ltoreq.0.5, while the value y satisfies 14.ltoreq.y.ltoreq.36 in terms of atomic percent; the material being substantially amorphous. A perpendicularly magnetized amorphous film made of this material is excellent in thermal stability, corrosion resistance etc., and affords a greater read output-to-noise ratio (C/N).

Abstract: A magneto-optical recording medium comprising a perpendicularly magnetized amorphous film made of an alloy of the formula: (R.sub.1-x M.sub.x).sub.a (Fe.sub.1-y Co.sub.y).sub.100-a, wherein R is at least one of La, Ce, Pr, Nd, Sm, Ho, Er and Yb; M is at least one of Tb, Gd and Dy; 0.ltoreq.x<0.5; 0<y<1; and 10.ltoreq.a.ltoreq.40, is large in the Kerr rotation angle, excellent in coercivity and affords a larger read output-to-noise ratio (C/N).

Abstract: Amorphous alloys having high strength, high hardness, high crystallization temperature, high saturation magnetic induction, low coercive force, high magnetic permeability and particularly low deterioration of magnetic properties with lapse of time, have a composition formula ofT.sub.a X.sub.b Z.sub.c or T.sub.a' X.sub.b' Z.sub.c' M.sub.d,whereinT is at least one of Fe, Co and Ni,X is at least one of Zr, Ti, Hf and Y,Z is at least one of B, C, Si, Al, Ge, Bi, S and P,a is 70-98 atomic %,b is not more than 30 atomic %,c is not more than 15 atomic %,sum of a, b and c is 100 atomic %,M is at least one Mo, Cr, W, V, Nb, Ta, Cu, Mn, Zn, Sb, Sn, Be, Mg, Pd, Pt, Ru, Os, Rh, Ir, Ce, La, Pr, Nd, Sm, Eu, Gd, Tb and Dy,a' is 70-98 atomic %,b' is not more than 30 atomic %,c' is not more than 15 atomic %,d is not more than 20 atomic %, andsum of a', b', c' and d is 100 atomic %.

Abstract: There is provided a structure of a composite type magnetic head and its manufacturing method. The composite type magnetic head comprises: two high permeability ferrite blocks with projections having nearly edged sections formed thereon; magnetic films having a high saturation flux density deposited on the side faces of the projections, the magnetic films confronting each other via a functional gap near front ends of said projections; guard films deposited over the magnetic films comprising a non-magnetic material; and non-magnetic materials filled on the guard films up to side face of the coil. This magnetic head exhibits excellent recording and reproducing characteristics. The contour effect is negligibly small. The reaction between the magnetic film and the non-magnetic material is prevented by the guard film.

Abstract: A magnetic head core and a method of fabricating same, wherein a magnetic circuit is constituted by a pair of magnetic films having a V-shaped cross section which face each other at each protrudent section through the gap material. The cross-sectional portion of the V-shaped film is exposed to the surface facing the magnetic recording medium. The protrusions of the magnetic film pair have tip planes parallel to each other and substantially perpendicular to the moving direction of the magnetic recording medium. The tip plane has a width defined by the line of intersection between the plane and the surface facing the magnetic recording medium in correspondence to the recording track width. At least one of the magnetic films has a window for winding an excitation coil. The magnetic film is formed on the non-magnetic protection member having a V-shaped protrusion.

Abstract: A ferromagnetic amorphous alloy having a composition represented by (Co.sub.x Ni.sub.y Fe.sub.z).sub.a M.sub.b G.sub.c, wherein M is Cr, Mo and/or W, G is Zr, Hf and/or Ti and x, y, z and a, b, c are selected to meet the conditions of x=1-y-z, 0.ltoreq.y.ltoreq.0.2, 0.ltoreq.z.ltoreq.0.7, a=1-b-c, 0.ltoreq.b.ltoreq.0.05 and 0.05.ltoreq.c.ltoreq.0.2 This amorphous alloy has a superior magnetic characteristic and a high thermal stability.

Abstract: A ferromagnetic amorphous alloy having a composition represented by (Co.sub.x Ni.sub.y Fe.sub.z).sub.a M.sub.b G.sub.c, wherein M is Cr, Mo and/or W, G is Zr, Hf and/or Ti and x,y,z and a, b, c are selected to meet the conditions of x=1-y-z, 0.ltoreq.y.ltoreq.0.2, 0.ltoreq.z.ltoreq.0.7, a=1-b-c, 0.ltoreq.b.ltoreq.0.05 and 0.05.ltoreq.c.ltoreq.0.2 This amorphous alloy has a superior magnetic characteristic and a high thermal stability.