Engineered spin-valve type magnetoresistance in Fe3O4-CoFe2O4 core-shell nanoparticles

Kumar, Anil P and Ray, Sugata and Chakraverty, S and Sarma, DD (2013) Engineered spin-valve type magnetoresistance in Fe3O4-CoFe2O4 core-shell nanoparticles. In: APPLIED PHYSICS LETTERS, 103 (10).

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Abstract

Naturally occurring spin-valve-type magnetoresistance (SVMR), recently observed in Sr2FeMoO6 samples, suggests the possibility of decoupling the maximal resistance from the coercivity of the sample. Here we present the evidence that SVMR can be engineered in specifically designed and fabricated core-shell nanoparticle systems, realized here in terms of soft magnetic Fe3O4 as the core and hard magnetic insulator CoFe2O4 as the shell materials. We show that this provides a magnetically switchable tunnel barrier that controls the magnetoresistance of the system, instead of the magnetic properties of the magnetic grain material, Fe3O4, and thus establishing the feasibility of engineered SVMR structures. (C) 2013 AIP Publishing LLC.

Item Type:	Journal Article
Publication:	APPLIED PHYSICS LETTERS
Publisher:	AMER INST PHYSICS
Additional Information:	Copyright for this article belongs to the American Institute of Physics
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	16 Dec 2013 06:46
Last Modified:	16 Dec 2013 06:46
URI:	http://eprints.iisc.ac.in/id/eprint/47900

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