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Contributed by Jill Ackerman on 02/09/2014
Physics Spring Seminar Series:
Join us as Amlan Biswas of Florida University gives a talk entitled:
Dielectrophoretic Behavior in Electronically Phase Separated Manganite Thin Films
Competing ferromagnetic metallic (FMM) and insulating phases in the manganite (La1-yPry)1-xCaxMnO3 (LPCMO) leads to a phase separated state in which micrometer scale FMM regions behave in a fluid-like manner over a narrow temperature range (Fig. 1). I will discuss our experimental results which show that an electric field can realign the fluid-like FMM phases embedded in an insulating matrix resulting in anisotropic in-plane resistance in microstructures of LPCMO thin films. Time and voltage dependent resistance measurements show that the dynamic percolation of the FMM regions leads to an insulator to metal transition due to electric field induced realignment of the FMM regions which is analogous to the dielectrophoresis of metallic particles suspended in fluid media. In-plane strain anisotropy plays an important role in determining the speed of dynamic percolation of the FMM regions by modifying the local electric fields in the phase separated state. I will also show that small magnetic fields (~100 Oe) can significantly modify the dielectrophoretic behavior. These observations suggest an unconventional form of magnetoelectric coupling.
Tuesday, February 11th, *CNS 204* @ 12:10 p.m.
Pizza and refreshments provided for $1. Please bring your own cup. Remember to reuse, reduce, recycle.
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