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Electronic and spin states of C$$_{60}$$-Co thin films studied by XPS and X-ray magnetic circular dichroism

X線光電子分光及びX線磁気円偏光二色性によるC$$_{60}$$-Co薄膜の電子・磁気状態研究

松本 吉弘; 境 誠司; 楢本 洋*; 高木 康多*; 中川 剛志*; 横山 利彦*; 島田 敏宏*; 平尾 法恵; 馬場 祐治 ; 前田 佳均

Matsumoto, Yoshihiro; Sakai, Seiji; Naramoto, Hiroshi*; Takagi, Yasumasa*; Nakagawa, Takeshi*; Yokoyama, Toshihiko*; Shimada, Toshihiro*; Hirao, Norie; Baba, Yuji; Maeda, Yoshihito

Electronic and spin states of the codeposited C$$_{60}$$-Co films with large tunnel magnetoresistance (TMR) effect were investigated with the X-ray absorption and magnetic circular dichroism (MCD) spectroscopies. It is revealed that a C$$_{60}$$-Co compound formed in the C$$_{60}$$-Co granular films shows the clear MCD signal attributed to the spin-polarized Co 3d states hybridized with the C$$_{60}$$ pai orbitals. The magnetic response of these Co 3d-derived states agrees well with the temperature dependence of the observed MR ratio. This suggests the incorporation of the spinpolarized Co 3d-derived states of the C$$_{60}$$-Co compound into the observed TMR effect.

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