A Nuclear Magnetic Resonance Study on Rubrene-cobalt Nano-composites
Masashi Shiraishi, Haruka Kusai, Ryo Nouchi, Takayuki Nozaki, Teruya, Shinjo, Yoshishige Suzuki, Makoto Yoshida, Masashi Takigawa
TL;DR
This study uses NMR to investigate the interface in rubrene-Co nano-composites, revealing an enhanced hyperfine field that correlates with increased magnetoresistance, advancing understanding of molecular spintronics interfaces.
Contribution
It provides the first microscopic NMR analysis of the Co interface in molecular spintronic devices, linking hyperfine field enhancement to magnetoresistance improvements.
Findings
Enhanced hyperfine field of Co observed in nano-composites
Correlation between hyperfine field and magnetoresistance ratio
Microscopic interface investigation crucial for spin transport understanding
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.
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