Magnetocrystalline Anisotropy Energy and Its Field Dependence of Ni-Pd Alloys

The magnetocrystalline anisotropy energy difference Δ E a between the <111 > and <100 > directions and its field dependence d Δ E a /d H of Ni-Pd alloys have been studied in the temperature range from 4.2 K to 300 K and the magnetic field up to 20 kOe. At the concentration near 48 at%Pd, Δ E a shows the change in sign and has the extreme values, -5.1 ×10 5 erg/cm 3 and +3.2 ×10 5 erg/cm 3 , at about 20 at%Pd and 60 at%Pd, respectively. Temperature dependence of Δ E a is very steep in Ni rich region and gentle in Pd rich region. At the concentration near 60 at%Pd, d Δ E a /d H shows the change in sign and have the extreme values -0.67 erg/cm 3 Oe and +0.50 erg/cm 3 Oe at about 40 at%Pd and 70 at%Pd, respectively.