A Nuclear Magnetic Resonance Study on Rubrene-cobalt Nano-composites

Authors :: Shiraishi, Masashi
Kusai, Haruka
Nouchi, Ryo
Nozaki, Takayuki
Shinjo, Teruya
Suzuki, Yoshishige
Yoshida, Makoto
Takigawa, Masashi
Source :: Applied Physics Letters 93, 53103 (2008).
Publication Year :: 2008
Abstract: We implemented a nuclear magnetic resonance (NMR) study on rubrene(C42H28)-Co nano-composites that exhibit an enhanced magnetoresistance (MR) ratio of 80%. The 59Co NMR spin echo experiment enabled clarification of the hyperfine field of Co at the interface between the ferromagnet and the molecules, which has not been investigated for molecular spintronics. An enhanced hyperfine field of the Co was observed in the rubrene-Co nano-composites, which may be related to the enhancement of the MR ratio. This study demonstrates the importance of microscopic investigation of the interface between molecules and ferromagnets that governs spin-dependent transport in molecular spin devices.<br />Comment: 12pages, 3 figures, 1 table