Nanogranular thin film and magnetic recording media
AssigneeThe Foundation: the Research Institute for Electric and Magnetic Materials
InventorsMasato Watanabe, Tadayoshi Iwasa, Tsuyoshi Masumoto
Life of this patent
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Abstract
A nanogranular thin film consisting of nonmagnetic matrix and ferromagnetic fine particles in nano scale is improved to enhance the thermal stability and the S/N ratio. The ferromagnetic fine particles consist of (FeaCo1-a)1-xPtx, (0.3≦x≦0.7, 0.1≦x≦1), (FeaCo1-a)1-xPdx, (0.3≦x≦0.7, 0.1≦x≦1) or (FeaCo1-a)1-x(PtbPd1-b)x, (0.3≦x≦0.7, 0.1≦x≦1, and 0<b<1).
Claims6
A nanogranular thin film having 160 kA/m of coercive force and consisting of from 40 to 70 atomic % of a nonmagnetic matrix and from 60 to 30 atomic % of ferromagnetic fine particles having 20 nm or less of average particle size, being distributed in the nonmagnetic matrix, and being expressed by a general formula (FeaCo1-a)1-xPtx, with the atomic composition ratio of 0.3≦x≦0.7, 0.1≦x≦1.
A nanogranular thin film having 160 kA/m of coercive force and consisting of from 40 to 70 atomic % of a nonmagnetic matrix and from 60 to 30 atomic % of ferromagnetic fine particles having 20 nm or less of average particle size, being distributed in the nonmagnetic matrix, and being expressed by a general formula (FeaCo1-a)1-xPdx, with the atomic composition ratio of 0.3≦x≦0.7, 0.1≦x≦1.
A nanogranular thin film having 160 kA/m of coercive force and consisting of from 40 to 60 atomic % of a nonmagnetic matrix and from 60 to 30 atomic % of ferromagnetic fine particles having 20 nm or less of average particle size, being distributed in the nonmagnetic matrix, and being expressed by a general formula (FeaCo1-a)1-x(PtbPd1-b)x, with the atomic composition ratio of 0.3≦x≦0.7, 0.1≦x≦1, and 0<b<1.
A magnetic recording media comprising a nanogranular thin film having 160 kA/m of coercive force and consisting of from 40 to 70 atomic % of a nonmagnetic matrix and from 60 to 30 atomic % of ferromagnetic fine particles having 20 nm or less of average particle size, being distributed in the nonmagnetic matrix, and being expressed by a general formula (FeaCo1-a)1-xPtx, with the atomic composition ratio of 0.3≦x≦0.7, 0.1≦x≦1.
A magnetic recording media comprising a nanogranular thin film having 160 kA/m of coercive force and consisting of from 40 to 70 atomic % of a nonmagnetic matrix and from 60 to 30 atomic % of ferromagnetic particles having 20 nm or less of average particle size, being distributed in the nonmagnetic matrix, and being expressed by a general formula (FeaCo1-a)1-xPdx, with the atomic composition ratio of 0.3≦x≦0.7, 0.1≦x≦1.
A magnetic recording media consisting of a nanogranular thin film having 160 kA/m of coercive force and consisting of from 40 to 70 atomic % of a nonmagnetic matrix and from 60 to 30 atomic % of ferromagnetic particles having 20 nm or less of average particle size, being distributed in the nonmagnetic matrix, and being expressed by a general formula (FeaCo1-a)1-x(PtbPd1-b)x, with the atomic composition ratio of 0.3≦x≦0.7, 0.1≦x≦1, and 0<b<1.
Dependencies are inferred from the claim text.