Effect of "dipolar-biasing" on the tunability of tunneling magnetoresistance in transition metal oxide systems
Kumar, P. Anil · Sarma, D. D.
Original · 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.
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