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Engineered spin-valve type magnetoresistance in Fe3O4-CoFe2O4 core-shell nanoparticles
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
2013 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 103, no 10, 102406- p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2013. Vol. 103, no 10, 102406- p.
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
URN: urn:nbn:se:uu:diva-211903DOI: 10.1063/1.4819956ISI: 000324389700033OAI: oai:DiVA.org:uu-211903DiVA: diva2:669329
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2014-01-31Bibliographically approved

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Puri, Anil KumarSarma, Dipankar Das
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