The mechanism for ion-induced uniaxial magnetic anisotropy of ferromagnetic CoPt thin films is investigated using x-ray diffraction and soft x-ray emission spectroscopy. When CoPt multilayers 64 nm thick are irradiated with 80 keV Ar+ ions in an externally applied magnetic field, the magnetization of the ion-irradiated area shows a significant anisotropic angular dispersion in its hysteresis. Analysis of x-ray diffraction patterns and Co L3 emission spectra reveals that the formation of partially ordered (face-centered-tetragonal) CoPt phase and nonequivalent electronic hybridization between easy and hard axes causes the induction of a uniaxial magnetic anisotropy.
Bibliographical noteFunding Information:
This work was supported by the Natural Sciences and Engineering Research Council of Canada and the Canada Research Chair program. Additional support by the Yonsei Center for Nano Technology (YCNT) is gratefully acknowledged.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)