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Regensburg 2016 – scientific programme

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MA: Fachverband Magnetismus

MA 38: Multiferroics I (DF with MA)

MA 38.4: Talk

Thursday, March 10, 2016, 10:30–10:50, H25

Imaging of electric-field-induced magnetization reversal in Dy0.7Tb0.3FeO3 — •Ehsan Hassanpour Yesaghi1, Yusuke Tokunaga2, Thomas Lottermoser1, Yasujiro Taguchi3, Yoshinori Tokura3, 4, and Manfred Fiebig11Department of Materials, ETH Zürich, Zürich, Switzerland — 2Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan — 3RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan — 4Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan

Full control of the magnetic state via electric field was recently reported in Dy0.7Tb0.3FeO3. This material undergoes several magnetic phase transitions, including a multiferroic phase in which the polarization is induced by the symmetric exchange interaction of the rare earth moments and Fe spins. It was shown that the magnetization reversal in this material depends on both the magnitude and the time-derivative of the electric field, such that the switching occurs only if the E-field is applied sufficiently fast. Such behavior, however, was never investigated at the level of domains, which is crucial for its understanding and application in devices. Here we investigate the underlying physics of the time-dependent switching process using Faraday imaging technique in order to spatially resolve magnetic domains and domain walls. The observation of two distinct types of domains and their relation to the magnetic Fe/Dy sub-lattices will be discussed. The electric field dependence on the magnetic ordering will be presented.

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