MAGNETIC-ANISOTROPY OF NI CR MULTILAYERS

The magnetic anisotropy of Ni/Cr multilayers has been investigated by using vibrating sample magnetometer (VSM) and ferromagnetic resonance techniques (FMR). The FMR spectra are obtained as a function of the or ientation of the applied magnetic field from in-plane to out-of-plane. The results are fitted theoretically to determine the magnetic anisot ropy. From VSM and FMR, a positive value for Ni/Cr interface anisotrop y is obtained, which favours a perpendicular easy axis. The possible m echanism for the perpendicular anisotropy has been discussed and it ma y be attributed to the magnetostriction, caused by intrinsic stress du e to lattice mismatch.