National Synchrotron Light Source Lunch Time Seminar

"Origin of the magnetoelectric coupling in PZT/LSMO multiferroic structures"

Presented by Carlos A. F. Vaz, Department of Applied Physics and CRISP, Yale University, New Haven, CT 06520

Friday, February 12, 2010, 12:00 pm — Seminar Room, Bldg. 725

By using a combination of electric, transport, magnetic and spectroscopic techniques, we shed light on the origin of the magnetoelectric coupling recently observed in LaSrMnO3/PZT heterostructures. A modulation in the Mn valence state as a function of the PZT polarization is found from x-ray absorption near edge spectroscopy measurements, demonstrating the electronic origin of the magnetoelectric coupling effect. By correlating the changes in valency with the changes in magnetic moment, we conclude that a change in the spin configuration of LaSrMnO3 takes place at the interface. This effect is attributed to changes in the electron occupancy of the Mn 3d orbitals and the competing super-exchange and double exchange interactions that are a hallmark of these strongly correlated oxides.

Hosted by: Elaine DiMasi

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