Abstract: A soft magnetic thin film according to the invention has an atomic ratio composition represented by the formula:Fe.sub.(100-a-b) M.sub.a O.sub.bwherein M is at least one element selected from Group 3A elements and Group 4A elements, 2.ltoreq.a.ltoreq.15 and 4.ltoreq.b.ltoreq.35. It has a high saturation magnetic flux density Bs, high magnetic permeability .mu., low coercive force Hc, improved frequency response, high electric resistivity .rho., and good corrosion resistance.

Abstract: According to the invention, a magnetic recording medium is formed by using magnetic powder having a composition of the following formula:MeO.multidot.n[Fe.sub.2-x-y-z Ga.sub.x Cr.sub.y Al.sub.z O.sub.3 ]wherein Me is at least on element selected from the group consisting of Ba, Sr, Pb, and Ca,4.5.ltoreq.n.ltoreq.6, x.gtoreq.0, y.gtoreq.0, z.gtoreq.0,x/3+y/4+z/6.gtoreq.1/6, andx/6+y/10+z/11.ltoreq.1/6,preferably the number of those particles having a particle size of from 0.5d to 1.5d being at least 65% of the entire particles wherein is an average particle size, and the Fe content on the particle surface being substantially equal to the Fe content in the particle interior, and blending the powder with a binder. Thermomagnetic recording and thermomagnetic duplication are carried out using the medium. There results a magnetic layer which has high Hc, is not easily erased once recorded, has high squareness ratio, and enables thermomagnetic recording and thermomagnetic duplication at 100.degree. to 180.degree. C.

Abstract: A permanent magnet having high coercivity and energy product contains rare earth elements, boron, at least one element of Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W, and a blance of Fe or Fe and Co, and consists of a primary phase of substantially tetragonal grain structure, or a mixture of such a primary phase and an amorphous or crystalline rare earth element-poor auxiliary phase wherein the volume ratio of auxiliary phase to primary phase is smaller than a specific value.

Abstract: A permanent magnet material having high coercivity and energy product is provided which contains rare earth elements, boron, at least one element of Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W, optional nickel, and a balance of Fe or Fe and Co, and consists of a primary phase of substantially tetragonal grain structure, or a mixture of such a primary phase and an amorphous or crystalline rare earth element-poor auxiliary phase wherein the volume ratio of auxiliary phase to primary phase has a specific relationship to other parameters.

Abstract: In an R-Fe-B permanent magnet produced by a process including a rapid cooling, a composition of{R.sub.a (Ce.sub.b La.sub.1-b).sub.1-a }x(Fe.sub.1-z Co.sub.z).sub.100-x-y-w B.sub.y M.sub.w(R is at least one rare earth element except for La and Ce but including Y, 5.5.ltoreq.x<12, 2.ltoreq.y<15, 0.ltoreq.z.ltoreq.0.7, 0<w.ltoreq.10, 0.80.ltoreq.a.ltoreq.1.00, 0.ltoreq.b.ltoreq.1, M is Zr, Nb, Mo, Hf, Ta, W, Ti, and/or V) is proposed. The presence of the M element increases a ((BH)max) to a value higher than that of a composition wherein x is higher than 12 and makes the magnet more easily magnetizable.

Abstract: A magnetic recording medium for use in video and other applications is presented which comprises a substrate, a continuous thin magnetic layer of cobalt and at least one selected from nickel, chromium, and oxygen, preferably obliquely evaporated on the substrate, and a topcoat formed over the magnetic layer and made of a phosphate compound having the formula: ##STR1## where R is selected from the group consisting of substituted or unsubstituted alkyl radicals having 10 to 22 carbon atoms which may be saturated or have an unsaturated double bond in their backbone, and substituted or unsubstituted aryl, alkaryl, aralkyl and alkylarylalkyl radicals having 6 to 20 carbon atoms, andY.sup.1 and Y.sup.2 may be the same or different and selected from the group consisting of hydrogen atom, cations, and substituted or unsubstituted alkyl and aryl radicals, the alkyl radicals being saturated or having an unsaturated double bond in their backbone, and Y.sup.1 and Y.sup.2 may together represent a divalent cation.

Abstract: A magnetic recording medium for use in video and other applications is presented which comprises a substrate, a continuous thin magnetic layer of cobalt and at least one selected from nickel, chromium, and oxygen, preferably obliquely evaporated on the substrate, and a topcoat formed over the magnetic layer and consisting of a monoalkylamine in which the alkyl contains 10 to 22 carbon atoms.

Abstract: A magnetic recording medium for use in video and other applications is presented which comprises a substrate, a continuous thin magnetic layer of cobalt and at least one selected from nickel, chromium, and oxygen, preferably obliquely evaporated on the substrate, and a topcoat formed over the magnetic layer and made of a phosphate compound having the formula: ##STR1## where R is selected from alkyl radicals having 10 to 22 carbon atoms, and Y and Y' are independently selected from the group consisting of hydrogen atom, alkyl radicals and monovalent cations, and Y and Y' may together represent a divalent cation.

Abstract: A magnetic recording medium is prepared by forming a thin magnetic layer having the formulation(Co.sub.100-x Ni.sub.x).sub.100-y P.sub.ywherein x is in a range of 0 to 35 wt. % and y is in a range of more than 0 wt. % to 6 wt. % on a non-magnetic substrate by a sputtering method.

Abstract: During investigation of thermal stability of the amorphous magnetic alloys by the Inventors, it was discovered that, due to the application of heat to the alloys, the hysteresis loop of the conventional, amorphous magnetic alloys was shifted in such a manner that the initial permeability of the alloys was decreased. It was also discovered that the initial permeability of the conventional amorphous magnetic alloys was irreversibly changed due to the application of heat to and the withdrawal of heat from the alloys.The present invention is characterized by the discovery of an unexpected relationship between the content of metallic elements and a metalloid element(s) of the amorphous alloy composition, thereby providing novel alloy compositions with thermally stable magnetic properties.The present invention is also characterized by incorporating an additional element or elements into an amorphous magnetic alloy, thereby providing the alloy with thermal stability.