Relation of Coercive Force to Structural Properties of Electroplated Films

Abstract

Coercive forces (He) of Fe–Ni films were observed to depend on thickness, Fe/Ni ratio, and preferred crystal orientation in accordance with predictions based on the Behringer–Smith model. Annealing induces marked crystal growth and orientation of [111] axis normal to the plane in the Ni-rich films (> 80% Ni), but only moderate growth in the Fe-rich (< 80% Ni) films. He for Ni-rich films increases markedly while He for iron-rich films decreases slightly due to annealing. Variations of the anisotropy field, Hk, due to applied stress, indicate that reduction of He for the Fe-rich films results from moderate crystal growth while the increase of He for the Ni-rich films is due to the preferred orientation.

Magnetomechanical damping in stress-relieved Ni: the effect of the dc magnetic field

“…The magnetic field was generated by a 30 cm long coil with a field uniformity better than 98% within ±10.5 cm from the midpoint. In figure 1 the magnetic behaviour of the sample in the as-deposited state and subsequent to annealing are shown: the drastic reduction in coercivity (from 11.4 kA m −1 to 127 A m −1 ) confirms structural relaxation (via dislocation recovery and grain growth [35]) to a considerable extent.…”