Origin of the unconventional magnetoresistance in Sr(2)FeMoO6(6)

Ray, S and Middey, S and Jana, S and Banerjee, A and Sanyal, P and Rawat, R and Gregoratti, L and Sarma, DD (2011) Origin of the unconventional magnetoresistance in Sr(2)FeMoO6(6). In: EPL: Europhysics Letters, 94 (4).

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Abstract

The unusual magnetoresistance (MR) behavior in Sr2FeMoO6, recently termed as spin-valve-type MR (SVMR), presents several anomalies that are little understood so far. The difficulty in probing the origin of this phenomenon, arising from the magnetic property of only a small volume fraction of the ferromagnetic bulk, is circumvented in the present study by the use of ac susceptibility measurements that are sensitive to the slope rather than the magnitude of the magnetization. The present study unravels a spin-glass (SG) like surface layer around each soft ferromagnetic (FM) grain of Sr2FeMoO6. It is also observed that there is a very strong exchange coupling between the two, generating ``exchange bias'' effect, which consequently creates the ``valve'', responsible for the unusual MR effects. Copyright (C) EPLA, 2011

Item Type:	Journal Article
Publication:	EPL: Europhysics Letters
Publisher:	EDP Sciences
Additional Information:	Copyright of this article belongs to EDP Sciences.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	17 Jun 2011 07:54
Last Modified:	17 Jun 2011 07:54
URI:	http://eprints.iisc.ac.in/id/eprint/38228

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