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

被引：68
|
作者：
Kim, D. H. [1 ]
Lee, H. J. [1 ]
Kim, G. [1 ]
Koo, Y. S. [2 ]
Jung, J. H. [2 ]
Shin, H. J. [3 ]
Kim, J. -Y. [3 ]
Kang, J. -S. [1 ]
机构：
[1] Catholic Univ Korea, Dept Phys, Puchon 420743, South Korea
[2] Inha Univ, Dept Phys, Inchon 402751, South Korea
[3] POSTECH, PAL, Pohang 790784, South Korea
来源：
PHYSICAL REVIEW B | 2009年 / 79卷 / 03期
关键词：
barium compounds; electronic structure; iron compounds; magnetic circular dichroism; nanoparticles; spin polarised transport; X-ray absorption spectra; X-RAY-ABSORPTION; TRANSITION-METAL COMPOUNDS; OCTAHEDRAL SYMMETRY; CIRCULAR-DICHROISM; SPECTROSCOPY; OXIDES; IRON;
D O I：
10.1103/PhysRevB.79.033402
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
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页数：4
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