Journal
JOURNAL OF APPLIED PHYSICS
Volume 111, Issue 7, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3676228
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Funding
- Natural Sciences and Engineering Research Council of Canada
- Canada Foundation for Innovation
- U. S. DOE [DE-AC02-06CH11357]
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Evidence of elemental copper magnetism in Cu-coated gamma-Fe2O3 nanoparticles was revealed by element specific x-ray absorption spectroscopy and magnetic circular dichroism (XMCD). An interfacial layer of magnetic CuO was discovered that interacted with the Fe3+ surface magnetic moments. This unexpected exchange interaction canted the moments of the CuO, so that a non-zero net magnetic moment was measured. XMCD measurements as a function of field on the copper coated gamma-Fe2O3 nanoparticles indicated that the CuO magnetic moment was aligned with the octahedral Fe3+ and its magnetization was modified by the changing applied field. With increasing copper thickness, a stronger field dependence of the Fe3+ and Cu2+ magnetization was observed. (C) 2012 American Institute of Physics. [doi:10.1063/1.3676228]
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