Controlling orbital moment and spin orientation in CoO layers by strain

Details Controlling orbital moment and spin orientation in CoO layers by strain Controlling orbital moment and spin orientation in CoO layers by strain

2005-04-20

arxiv.org/abs/cond-mat/0504519v1

Phys. Rev. Lett. 95, 187205 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.95.187205

We have observed that CoO films grown on different substrates show dramatic differences in their magnetic properties. Using polarization dependent x-ray absorption spectroscopy at the Co L$_{2,3}$ edges, we revealed that the magnitude and orientation of the magnetic moments strongly depend on the strain in the films induced by the substrate. We presented a quantitative model to explain how strain together with the spin-orbit interaction determine the 3d orbital occupation, the magnetic anisotropy, as well as the spin and orbital contributions to the magnetic moments. Control over the sign and direction of the strain may therefore open new opportunities for applications in the field of exchange bias in multilayered magnetic films.

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