We have measured x-ray magnetic circular dichroism spectra at the Co and Pt -edges in perpendicular magnetization films, wherein the uniaxial magnetic anisotropy constant, , significantly increases with decreasing film thickness, , and reaches for . The anisotropy of the orbital magnetic moment (AOM) was estimated as a function of , and the relationship between AOM and is discussed. When the thickness was reduced, the AOM for Pt was nearly constant, whereas a weak increase was observed for Co . Both AOMs are small in contrast to the large , and any proportionality between AOM and was hardly recognized. This result indicates that a large AOM is not always a necessary and sufficient condition for the appearance of perpendicular magnetization.
Orbital contribution to perpendicular magnetic anisotropy in thin films
N. Ishimatsu, Y. Tsutsui, H. Maruyama, N. Nakajima, N. Tobita, M. Sawada, H. Namatame, N. Kawamura, H. Osawa, M. Suzuki; Orbital contribution to perpendicular magnetic anisotropy in thin films. J. Appl. Phys. 1 August 2009; 106 (3): 033902. https://doi.org/10.1063/1.3186018
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