Seminar by Yayoi Takamura

Control of Magnetic Domain Patterns In Complex Oxide Nanostructures

Yayoi Takamura, Ph.D.

UC Davis
The interfaces of perovskite oxides have been shown to exhibit unexpected functional properties not found in the
constituent materials. These properties arise due to various structural and chemical changes as well as electronic
and/or magnetic interactions occurring over nanometer length scales at the interfaces. Exchange interactions which
occur at the interface between ferromagnetic (FM) and antiferromagnetic (AFM) layers play a key role in devices
such as magnetic hard drives and magnetic random access memory, however, a fundamental understanding of the
phenomena remains elusive. In this work, we investigate exchange interactions in the FM/AFM system consisting
of FM half metal, La0.7Sr0.3MnO3 (LSMO) and the G-type AFM insulator La1-xSrxFeO3 using soft x-ray magnetic
spectroscopy and microscopy. These results demonstrate the complex interactions between shape-induced
anisotropy in the FM/AFM layers and interface exchange interactions on the magnetic domain patterns of complex
oxide nanostructures.
Yayoi Takamura received her B.S. from Cornell University in 1998 and her M.S. and Ph.D. degrees from Stanford
University in 2000 and 2004, respectively, all in the field of Materials Science and Engineering. She was a
postdoctoral researcher at UC Berkeley with Prof. Yuri Suzuki in the Dept. of Materials Science and Engineering
before joining the Dept. of Chemical Engineering and Materials Science at UC Davis in July 2006, where she is
currently an associate professor. Her research focuses on the growth of complex oxide thin films, heterostructures,
and nanostructures and the characterization of the novel functional properties associated with their interfaces. Prof.
Takamura is a recipient of the NSF CAREER Award and the DARPA Young Faculty Award.

Seminar Date