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Effect of "dipolar-biasing" on the tunability of tunneling magnetoresistance in transition metal oxide systems
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2012 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 100, no 26, 262407- p.Article in journal (Refereed) Published
Abstract [en]

We observe an unusual tunneling magnetoresistance (TMR) phenomenon in a composite of La2/3Sr1/3MnO3 with CoFe2O4 where the TMR versus applied magnetic field loop suggests a "negative coercive field." Tracing its origin back to a "dipolar-biasing" of La2/3Sr1/3MnO3 by CoFe2O4, we show that the TMR of even a single composite can be tuned continuously so that the resistance peak or the highest sensitivity of the TMR can be positioned anywhere on the magnetic field axis with a suitable magnetic history of the sample. This phenomenon of an unprecedented tunability of the TMR should be present in general in all such composites. 

Place, publisher, year, edition, pages
2012. Vol. 100, no 26, 262407- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-178111DOI: 10.1063/1.4731206ISI: 000305831500048OAI: oai:DiVA.org:uu-178111DiVA: diva2:542020
Available from: 2012-07-27 Created: 2012-07-27 Last updated: 2012-09-18Bibliographically approved

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Sarma, Dipankar Das
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