Anisotropic Magnetoresistance and Weak Localization in Granular System Ni-MgO

Anton Grebennikov; Oleg Stognei

doi:10.4028/www.scientific.net/SSP.233-234.501

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Anisotropic Magnetoresistance and Weak Localization in Granular System Ni-MgO

Abstract:

Magnetoresistive effect and electrotransport properties of Ni_х(MgO)_100-_х (x: 21-48 at.%) granular composites have been investigated. It is found that prepercolated composites (x < 24 at.%) do not exhibit magnetoresistive properties. After percolation threshold (x: 27-29 at.%) the composites exhibit isotropic negative magnetoresistance (-0,2 %) which has not tunneling nature. Also weak localization is realized in these samples at temperatures below 100 K. At high metal concentration (32 at.% < x) the composites exhibit anisotropic magnetoresistance.

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Solid State Phenomena (Volumes 233-234)

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501-504

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https://doi.org/10.4028/www.scientific.net/SSP.233-234.501

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Online since:

July 2015

Authors:

Anton Grebennikov*, Oleg Stognei

Keywords:

Anisotropic Magnetoresistance, Nanocomposite, Percolation, Thin Film, Tunnel Magnetoresistance, Weak Localization

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