Interface electronic structures of BaTiO3@X nanoparticles (X=gamma-Fe2O3, Fe3O4, alpha-Fe2O3, and Fe) investigated by XAS and XMCD

Title
Interface electronic structures of BaTiO3@X nanoparticles (X=gamma-Fe2O3, Fe3O4, alpha-Fe2O3, and Fe) investigated by XAS and XMCD
Authors
Kim, D.H.; Lee, H.J.; Kim, G.; Koo, Y.S.; Jung, J.H.; Shin, H.J.; Kim, J.Y.; Kang, J.S.
Keywords
electronic structure, magnetic circular dichroism, barium compounds
Issue Date
2009-01
Publisher
AMER PHYSICAL SOC
Abstract
The electronic structures of BaTiO3@X (core@shell) nanoparticles (X=gamma-Fe2O3, Fe3O4, and Fe) have been investigated by employing soft x-ray-absorption spectroscopy and x-ray magnetic circular dichroism (XMCD). It is found that the valence states of Ti ions near interfaces are formally tetravalent (Ti4+:3d(0)) and that the valence states of Fe ions in shells are essentially the same as those of the corresponding bulk materials, with some disorder in the site occupations for X=gamma-Fe2O3 and Fe3O4. The negligible Ti 2p XMCD signals were observed, indicating that the induced spin polarization of the interface Ti 3d electrons is negligible in BaTiO3@X nanoparticles.
URI
http://dspace.inha.ac.kr/handle/10505/1977
ISSN
1098-0121
Appears in Collections:
College of Natural Science(자연과학대학) > Physics (물리학) > Journal Papers, Peports(물리학 학술논문, 보고서)
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