Journal
PHYSICAL REVIEW B
Volume 79, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.052403
Keywords
annealing; antiferromagnetic materials; chemical analysis; cobalt; exchange interactions (electron); ferromagnetic materials; interface magnetism; magnetic anisotropy; magnetic domains; magnetic moments; nickel compounds; X-ray microscopy; X-ray spectra
Funding
- U. S. Department of Energy [DE-AC02-05CH11231]
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Using soft x-ray spectromicroscopy we show that NiO(001) exhibits a crystallographic and magnetic domain structure near the surface identical to that of the bulk. Upon Co deposition a perpendicular coupling between the Ni and Co moments is observed that persists even after formation of uncompensated Ni spins at the interface through annealing. The chemical composition at the interface alters its crystallographic structure and leads to a reorientation of the Ni moments from the < 112 > to the < 110 > direction. We show that this reorientation is driven by changes in the magnetocrystalline anisotropy rather than exchange coupling mediated by residual uncompensated spins.
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