Magnetoresistance and Hall Effects for Fe-Ni-M Alloy Thin Films

The relation between the anisotropic magnetoresistivity ratio ¿¿/¿0 and the ordinary Hall coefficient R0 and extraordinary Hall coefficient Rs were studied for Ni-Fe binary alloy and for (Ni89.5Fe10.5)M (M = Co,Cu,Nb,Gd,Al,Si and Bi) ternary alloy thin films, to obtain guidelines in searching for new materials with large values of ¿¿/¿0. The value of ¿¿/¿0 increases with increases in the absolute value of R0, and also shows a maximum (¿¿/¿0 ¿ 4%) at Rs = 0. For ferromagnetic metals, a large value of ¿¿/¿0 can be obtained under the following conditions: (1) the sign of R0 is negative and the absolute value of R0 is large (carriers are electron-like and the effective carrier density ¿eff is small), and (2) Rs is zero.