Speaker
Dr
Rajesh Vilas Chopdekar
(Paul Scherrer Institut)
Description
In this work, we have used element-specific soft X-ray photoemission electron microscopy (X-PEEM) and polarized neutron reflectivity (PNR) to determine the influence of piezoelectric-ferroelectric BaTiO3 (BTO) on the magnetic properties of magnetostrictive ferromagnetic spinel CoFe2O4 and NiFe2O4 thin films. By using a combination of circular and linear dichroism spectro-microscopy as well as neutron reflectivity, we have spatially mapped magneto-electric interactions in a model system of a ferroelectric substrate with an epitaxial ferromagnetic film as cap layer. By performing temperature, angular, and polarization dependent studies, we have found that this strain-induced effect strongly influences the magnetic anisotropy of individual 250 nm wide magnetic domains of the spinel films. The observation of magneto-electric interactions in individual domains has provided valuable insight into strain-driven domain nucleation and reorientation, important for implementation of artificial multiferroic materials in devices utilizing electric-field control of the magnetization.
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poster
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Multiple Order Parameter Systems
Primary author
Dr
Rajesh Vilas Chopdekar
(Paul Scherrer Institut)
Co-authors
Prof.
Frithjof Nolting
(Paul Scherrer Institut)
Dr
Jochen Stahn
(Paul Scherrer Institut)
Dr
Laura Heyderman
(Paul Scherrer Institut)
Prof.
Stephen Lee
(School of Physics and Astronomy, University of St. Andrews)
Prof.
Yayoi Takamura
(Department of Chemical Engineering and Materials Science, University of California, Davis)
