Photoemission and X-ray absorption studies of valence states in (Ni,Zn,Fe,Ti)O thin films exhibiting photoinduced magnetization

Kobayashi, Masaki*; Oki, Yasuhiro*; Takizawa, Masaru*; Song, G. S.*; Fujimori, Atsushi; Takeda, Yukiharu ; Terai, Kota*; Okane, Tetsuo ; Fujimori, Shinichi ; Saito, Yuji ; Yamagami, Hiroshi; Seki, Munetoshi*; Kawai, Tomoji*; Tabata, Hitoshi*

By means of photoemission and X-ray absorption spectroscopy, we have studied the electronic structure of (Ni,Zn,Fe,Ti) $_{3}$ O $_{4}$ thin films, which exhibits a cluster glass behavior with a spin-freezing temperature of K and photo-induced magnetization (PIM) below . The Ni and Zn ions were found to be in the divalent states. Most of the Fe and Ti ions in the thin films were trivalent (Fe $^{3+}$ ) and tetravalent (Ti $^{4+}$ ), respectively. While Ti doping did not affect the valence states of the Ni and Zn ions, a small amount of Fe $^{2+}$ ions increased with Ti concentration, consistent with the proposed charge-transfer mechanism of PIM.

Language	:	English
Journal	:	Applied Physics Letters
Volume	:	92
Number	:	8
Pages	:	p.082502_1 - 082502_3
Publication Year/Month	:	2008/02
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Paper URL	:	https://doi.org/10.1063/1.2885080
DOI for research data	:
Keywords	:	no keyword
Research Facility	:	SPring-8(大型放射光施設)
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Article of JAEA R&D Review	:
Cooperating Institute	:	東京大学

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Registration No. : AA20080733
JAEA Abstracts No. :
Paper Submission No. : 5975

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