Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 20, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3251777
Keywords
europium compounds; ferromagnetic materials; magnetic circular dichroism; magnetic moments; magnetic semiconductors; magnetometers; nanofabrication; nanostructured materials; wide band gap semiconductors; X-ray absorption spectra
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Funding
- NSF [DMR-0548232]
- NIH [CA126701]
- U. S. Department of Energy
- Office of Science
- Office of Basic Energy Sciences [DE-AC0206CH11357]
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A soft x-ray absorption and x-ray magnetic circular dichroism (XMCD) study of the ferromagnetism in solution-grown EuS nanocrystals (NCs) is reported. The absorption edges of Eu M-5 and M-4, S K, O K, and P K were probed to determine elementally specific contributions to the magnetism of EuS NCs. Differential spin absorption was observed by XMCD at the Eu M-5,M-4 edges confirming the presence of a magnetic moment on the Eu2+ 4f shell. No dichroic signal was observed for S, O, or P. Vibrating sample magnetometry of ensembles of NCs shows ferromagnetic properties consistent with the XMCD studies.
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