I. Morgenstern, K.A. Müller, et al.
Physica B: Physics of Condensed Matter
We propose a quantum mechanism for surface magnetic anisotropy in a special class of spinel ferrite. One-ion anisotropy arises from the orbitally degenerate state of a 3dε{lunate}-electron bound to an Fe3+ core on a spinerl B-site near a (110)-facet. Dependence of electron energy on the orientation of the B-site trigonal symmetry axis with respect to the facet plane leads to a maximum in surface anisotropy versus surface charge. This explains published experimental dependences of the coercive field on the amount of polymeric (NaPO3)n·Na2O deposited onto chemically reduced acicular particles of γ-Fe2O3. The experimental magnitudes of coercivity change are understood if individual polyphosphate molecules oxidize such anisotropic subsurface sites with considerable quamtum efficiency. © 1992.
I. Morgenstern, K.A. Müller, et al.
Physica B: Physics of Condensed Matter
Thomas E. Karis, C. Mark Seymour, et al.
Rheologica Acta
William Hinsberg, Joy Cheng, et al.
SPIE Advanced Lithography 2010
Michiel Sprik
Journal of Physics Condensed Matter