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SYNF: Symposium Ferroic materials and novel functionalities

SYNF 1: Ferroic materials and novel functionalities I

SYNF 1.2: Vortrag

Dienstag, 26. Februar 2008, 10:45–11:00, A 151

Exchange bias coupling in La0.7Sr0.3MnO3/BiFeO3 heterostructures — •Mark Huijben, Ying-Hao Chu, Lane W. Martin, Jan Seidel, Nina Balke, Martin Gajek, Chan-Ho Yang, Pu Yu, Micky Holcomb, and Ramamoorthy Ramesh — Department of Physics & Department of Materials Science and Engineering, University of California, Berkeley, USA

Heterostructures based on perovskite transition-metal oxides have attracted much attention because of the possibility of tuning the magnetic and electronic properties of thin films through interface effects such as exchange interactions, charge transfer, and epitaxial strain. The development and understanding of multiferroic materials such as BiFeO3, have piqued the interest with the promise of coupling between order parameters such as ferroelectricity and antiferromagnetism. In this study we investigate the magnetic properties in ferromagnetic-antiferromagnetic multiferroic heterostructures by using atomic scale controlled growth through laser-MBE in combination with real-time RHEED monitoring. We will show the controlled coupling at the interfaces in La0.7Sr0.3MnO3/BiFeO3 heterostructures. This coupling behavior is investigated by structural measurements, such as x-ray reciprocal space mapping to clarify strained states, and magnetic measurements to gain a deeper fundamental understanding of the interactions at these interfaces. The interface coupling displays a strong enhancement in the coercivity of the La0.7Sr0.3MnO3 layer and a large shift in the magnetization hysteresis loops, indicating the existence of exchange bias coupling.