Long-term relaxation of magnetoresistance in a granular ferromagnet View Full Text


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Article Info

DATE

2002-04

AUTHORS

V. V. Rylkov, B. A. Aronzon, A. B. Davydov, D. Yu. Kovalev, E. Z. Meilikhov

ABSTRACT

Long-term relaxations (of the logarithmic type) are revealed in the tunnel magnetoresistance of Fe/SiO2 nanocomposites, which are due to variation of the magnetization of the nanocomposites. Good qualitative agreement between experimental results and the recently developed concepts of the behavior of magnetization of granular ferromagnets [7] proves that the revealed relaxations are associated with the spin-glass nature of the magnetic state of such systems. It is further demonstrated that it is, in principle, impossible to observe such relaxations using the anomalous Hall effect (proportional to magnetization) because of physical reasons, i.e., mesoscopic fluctuations of the Hall voltage as a result of the magnetic field effect and variation of magnetization. More... »

PAGES

779-784

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/1.1477903

DOI

http://dx.doi.org/10.1134/1.1477903

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1027749121


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