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HAXPES study of spin Seebeck system Pt/Y$$_{3}$$Fe$$_{5}$$O$$_{12}$$

Kobata, Masaaki  ; Yoshii, Kenji  ; Fukuda, Tatsuo  ; Kawasaki, Ikuto  ; Okane, Tetsuo  ; Yamagami, Hiroshi; Yaita, Tsuyoshi; Harii, Kazuya; Ieda, Junichi   ; Okayasu, Satoru  ; Hioki, Tomosato*; Kikkawa, Takashi*; Saito, Eiji

We have conducted high energy X-ray photoelectron spectroscopy (HAXPES) measurements on spin Seebeck system Pt/Y$$_{3}$$Fe$$_{5}$$O$$_{12}$$(YIG) using synchrotron radiation at BL22XU of SPring-8. It was found that the Fe$$^{3+}$$ ions are partially converted to a metallic Fe$$^{0}$$ state, a finding being consistent with the proposed mechanism of characteristic behavior such as anomalous Hall effect. We have also observed that two or more valence states of Fe ions in samples with low electric power generations, showing an inhomogeneous nature of the system. The other spectra such as O 1s and Pt 4f will be presented at the conference,

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