X-ray absorption spectroscopy and magnetic circular dichroism in codeposited C $_{60}$ -Co films with giant tunnel magnetoresistance

Matsumoto, Yoshihiro; Sakai, Seiji; Takagi, Yasumasa*; Nakagawa, Takeshi*; Yokoyama, Toshihiko*; Shimada, Toshihiro*; Mitani, Seiji*; Naramoto, Hiroshi*; 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 generated in the C $_{60}$ -Co films shows the clear MCD signal attributed to the spin-polarized Co 3d states hybridized with C $_{60}$ orbitals. The magnetic response of these Co 3d-derived states agrees well with temperature dependence of the observed MR ratios of the granular C $_{60}$ -Co films. This suggests the incorporation of the spin-polarized Co 3d-derived states of the C $_{60}$ -Co compound into the observed TMR effect.

Language	:	English
Journal	:	Chemical Physics Letters
Volume	:	470
Number	:	4-6
Pages	:	p.244 - 248
Publication Year/Month	:	2009/03
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Paper URL	:	https://doi.org/10.1016/j.cplett.2009.01.032
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Press Release	:	フラーレン-コバルト薄膜の巨大な磁気抵抗効果の起源を解明; 有機分子のスピンが流れる電子のスピンを偏らせる
Article of JAEA R&D Review	:	Electronic Origin of Giant Magnetoresistance Effect in C $_{60}$ -Co Films; Spectroscopic Examination of Spin States in Organic-Transition Metal Materials[/]
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Registration No. : AA20080992
JAEA Abstracts No. : 38000025
Paper Submission No. : 6607

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

X-ray absorption spectroscopy and magnetic circular dichroism in codeposited C $_{60}$ -Co films with giant tunnel magnetoresistance