Contribution of the Magnetoelastic Term to the Effective Magnetic Anisotropy ConstantK1for Nickel

The contribution of the magnetoelastic term ( K 1 ) M.E. to the effective magnetic anisotropy constant K 1 has been evaluated for Ni using the published data on elastic constants and the magnetostriction constants redetermined in the present measurement. Measurements were done with the (001) and (011) disks by means of the strain gauge technique. At high temperatures where the sign of K 1 is positive, the sign of ( K 1 ) M.E. is positive and the magnitude is a little larger than that of K 1 . The change in sign of K 1 from negative to positive with a rise in temperature is therefore ascribable to ( K 1 ) M.E. , and the intrinsic magnetic anisotropy constant ( K 1 ) 0 (= K 1 -( K 1 ) M.E. ) decreases monotonically in magnitude without accompanying any change in sign, as temperature rises up to the Curue temperature T c .