Magnetoresistance and Exchange Bias Effect of (Co₂MnSi)_1-X-(NiO)_X Nanocomposites

Abstract:

The (Co₂MnSi)_1-x-(NiO)_x (x = 0.0, 0.1, 0.2, 0.3) nanocomposites were fabricated by mechanical alloying using Co₂MnSi Heusler alloy and NiO nanoparticles. It is revealed that antiferromagnetic NiO nanocrystallines dramatically enhances the magnetoresistance of the nanocomposites more than 20 times larger than that of the NiO-free Co₂MnSi alloys at 300 K. The Exchange bias effect of the nanocomposites suggests that the spin-dependent tunneling and scattering at the interfaces of ferromagnetic/antiferromagnetic are responsible for the enhancement of the magnetoresistance.

• Periodical: Advanced Materials Research (Volumes 399-401)
• Pages: 620-624
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.399-401.620
• Online since: November 2011
• Authors: Xin Le Cai, Shan Dong Li, Mei Mei Liu, Jian Peng Wu, Yi Hu, Jie Qiu, Jian Hua Lin
• Keywords: Exchange Bias, Half-Metallic Ferromagnets, Interface Coupling, Magnetoresistance

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