Patent ID: 7480122
Filing Date: 2009-01-20
Classification: B82Y,G01R,G11B,H01F

Abstract:
1. A magnetic detecting device comprising: fixed magnetic layers whose magnetization direction is fixed; and a free magnetic layer which is formed between the fixed magnetic layers via non-magnetic material layers and whose magnetization direction varies by an external magnetic field, wherein at least one of the fixed magnetic layers and the free magnetic layer have a magnetic alloy layer whose composition formula is represented as X a composition ratio d of the element α is within a range which is greater than 0 at. % and not more than 17.5 at. %, the element X is at least one element selected from a group consisting of Co, Rh, Pt, Au, Pd, Ir, Ru, Ag, Zn, Cd, and Fe, the element Y is at least one element selected from a group consisting of Mn, Fe, Ti, V, Zr, Nb, Hf, Ta, Cr, and Co, the element Z is at least one element selected from a group consisting of Al, Sn, In, Sb, Ga, Si, Ge, Pb, and Zn, the element α is at least one of Cu or Ni, and a, b, c, and d indicate average composition ratios (at. %) in the magnetic alloy layer and satisfy a relationship of a+b+c+d=100 at. %.