X-ray absorption spectroscopy and magnetic circular dichroism in codeposited C₆₀–Co films with giant tunnel magnetoresistance

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• 作者：Yoshihiro Matsumoto ; Seiji Sakai ; Yasumasa Takagi ; Takeshi Nakagawa ; Toshihiko Yokoyama ; Toshihiro Shimada ; Seiji Mitani ; Hiroshi Naramoto ; Yoshihito Maeda
• 刊名：Chemical Physics Letters
• 出版年：2009
• 出版时间：5 March 2009
• 年：2009
• 卷：470
• 期：4-6
• 页码：244-248
• 全文大小：803 K

文摘

Electronic and spin states of the codeposited C₆₀–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 C₆₀–Co compound generated in the C₆₀–Co films shows the clear MCD signal attributed to the spin-polarized Co 3d states hybridized with C₆₀ π orbitals. The magnetic response of these Co 3d-derived states agrees well with temperature dependence of the observed MR ratios of the granular C₆₀–Co films. This suggests the incorporation of the spin-polarized Co 3d-derived states of the C₆₀–Co compound into the observed TMR effect.