Magnetoresistance in Crystalline and Amorphous Fe-Co-Ni Based Alloys

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Abstract
The ferromagnetic anisotropy of electrical resistivity (FAR) has been measured at 300 and 77 K, together with the saturation magnetizationnB, the Curie temperature and the temperature coefficient of resistivity (TCR), for a large number of (Fe-Co-Ni)-X alloys in fcc, bcc and amorphous phases. Several empirical rules are presented. (1) The FAR is found to be correlated not only withnBbut also with the resistivity. In the low-resistivity regime the FAR reaches a maximum at aboutnB=1.0. The maximum becomes suppressed with increasing resistivity. In the high-resistivity regime, into which the amorphous alloys are grouped, the FAR increases monotonically with increasing magnetization. (2) The FAR value decreases rapidly with increasing resistivity. The value in the amorphous phase is one to two orders of magnitude smaller than that in the low-resistivity alloys. (3) Both FAR and TCR are closely interrelated; an increase in the FAR is always accompanied with an increase in TCR.