Ferromagnetic Crystalline Anisotropy of Pd_1-<i>x</i>Fe_<i>x</i>Alloys. III. \(0.38\lesssim{x}\lesssim0.5\), L1₀-Type Ordered Phase

Abstract

The uniaxial magnetic crystalline anisotropy of Pd 1- x Fe x in tetragonal L1 0 -type ordered phase (\(0.38\lesssim{x}\lesssim0.50\)) was obtained from magnetization curves of quasi-single crystal samples in a magnetic field up to 100 kOe. The first anisotropy constant K u1 at 4.2 K of stoichiometric composition ( x =0.5) was estimated to be 2.1×10 7 erg/cm 3 . The constants of x =0.42 and 0.38 were 1.5×10 7 and 0.8×10 7 erg/cm 3 , respectively. From the present result the most evident magnetic field dependence of torque curve found in x =0.42 (reported in Part II) was attributable to the difficulty to suppress the ordered atomic arrangement due to the highest order-disorder transition temperature of this sample. K u2 was much smaller than K u1 for all compositions.