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.

引用

页数：4

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