Anisotropic magnetoresistance in transition metal-boron amorphous alloys

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Abstract
Anisotropic magnetoresistance ratio (AMR) was measured for binary and ternary (Fe,Co,Ni)‐B amorphous alloys over the temperature range from 77K to room temperature varying the composition systematically. The largest AMR at room temperature was 0.45% for (Fe0.95Co0.05)84B16 alloy, which is smaller by about one order in magnitude than those in crystalline binary transition metal alloys. It was found that AMR in Co‐Ni‐B alloys exhibits a maximum similar to crystalline Co‐Ni alloys. The maximum values were obtained for the alloys having magnetic moment of 0.56μB regardless of composition, meaning that the rigid band model is applicable to the anisotropic magnetoresistance in Co‐Ni‐B amorphous alloys.