Large magnetoresistance in Fe3O4/molecule nanoparticles

S. Wang; F. J. Yue; L. Lin; Y. J. Shi; D. Wu

doi:10.1117/12.861452

24 August 2010 Large magnetoresistance in Fe₃O₄/molecule nanoparticles

S. Wang, F. J. Yue, L. Lin, Y. J. Shi, D. Wu

Proceedings Volume 7760, Spintronics III; 77601D (2010) https://doi.org/10.1117/12.861452
Event: SPIE NanoScience + Engineering, 2010, San Diego, California, United States

Abstract

In this work, we successfully fabricate Fe3O4 nanoparticles self-assembled with molecules to explore a new approach of studying the molecular spintronics. Fourier transform infrared spectroscopy measurements indicate that one monolayer molecules chemically bonds to the Fe3O4 nanoparticles and the physically absorbed molecules do not exist in the samples. The magnetoresistance (MR) of molecule fully coated ~10 nm size nanoparticles is up to 7.3% at room temperature and 17.5% at 115 K under a field of 5.8 kOe. And the MR ratio is more than two times larger than that of pure Fe₃O₄ nanoparticles. This enhanced MR is likely arising from weak spin scattering while carriers transport through the molecules. Moreover, a very large low field magnetoresistance is also observed with ~500nm ferromagnetic Fe₃O₄ nanoparticles coated with acetic acid molecules. Those features open a door for the development of future spin-based molecular electronics.

Citation Download Citation

S. Wang, F. J. Yue, L. Lin, Y. J. Shi, and D. Wu "Large magnetoresistance in Fe₃O₄/molecule nanoparticles", Proc. SPIE 7760, Spintronics III, 77601D (24 August 2010); https://doi.org/10.1117/12.861452

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