Engineering Magnetic Interactions in Complex Oxide Heterostructures
Complex oxides possess a wide range of intriguing and technologically relevant functional properties including ferromagnetism, ferroelectricity, and superconductivity. Furthermore, the interfaces of complex oxides have been shown to exhibit unexpected functional properties not found in the constituent materials. These functional properties arise due to various structural and chemical changes as well as electronic and/or magnetic interactions occurring over nanometer length scales at interfaces, and they have the potential to be harnessed to enable new, more versatile, and energy efficient devices. In this talk, I will present some of our recent work investigating the interfacial interactions which occur at ferromagnetic/antiferromagnetic (FM/AF) and FM/FM interfaces. While these interfacial interactions have been widely studied in metallic systems, fundamental differences are observed in complex oxides systems. In this talk, I will report on a unique spin-flop coupling observed at FM La0.7Sr0.3MnO3 /AFM La0.7Sr0.3FeO3 interfaces and contrast these interfaces to FM/FM interfaces consisting of hard FM La0.7Sr0.3CoO3 and soft FM La0.7Sr0.3MnO3 where exchange-spring behavior has been observed. These studies involved detailed structural and magnetic characterization of the individual layers using a combination of resonant x-ray reflectometry and element-specific soft x-ray magnetic spectroscopy, which provide key insight into interfacial effects over conventional characterization techniques such as bulk magnetometry. These results demonstrate how the many competing interactions in complex oxide heterostructures opens up new intriguing opportunities to tailor their functional properties for future spintronic device applications.
Date and Time
Location
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Registration
- Date: 19 Apr 2019
- Time: 11:00 AM to 12:15 PM
- All times are (GMT-07:00) US/Mountain
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- 1420 Austin Bluffs Park
- Colorado Springs, Colorado
- United States 80918
- Building: Osborne
- Room Number: A204
- Contact Event Host
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Zbigniew Celinski
Department of Physics
UCCS
- Co-sponsored by UCCS
Speakers
Yayoi Takamura of University of California, Davis
Engineering Magnetic Interactions in Complex Oxide Heterostructures
Complex oxides possess a wide range of intriguing and technologically relevant functional properties including ferromagnetism, ferroelectricity, and superconductivity. Furthermore, the interfaces of complex oxides have been shown to exhibit unexpected functional properties not found in the constituent materials. These functional properties arise due to various structural and chemical changes as well as electronic and/or magnetic interactions occurring over nanometer length scales at interfaces, and they have the potential to be harnessed to enable new, more versatile, and energy efficient devices. In this talk, I will present some of our recent work investigating the interfacial interactions which occur at ferromagnetic/antiferromagnetic (FM/AF) and FM/FM interfaces. While these interfacial interactions have been widely studied in metallic systems, fundamental differences are observed in complex oxides systems. In this talk, I will report on a unique spin-flop coupling observed at FM La0.7Sr0.3MnO3 /AFM La0.7Sr0.3FeO3 interfaces and contrast these interfaces to FM/FM interfaces consisting of hard FM La0.7Sr0.3CoO3 and soft FM La0.7Sr0.3MnO3 where exchange-spring behavior has been observed. These studies involved detailed structural and magnetic characterization of the individual layers using a combination of resonant x-ray reflectometry and element-specific soft x-ray magnetic spectroscopy, which provide key insight into interfacial effects over conventional characterization techniques such as bulk magnetometry. These results demonstrate how the many competing interactions in complex oxide heterostructures opens up new intriguing opportunities to tailor their functional properties for future spintronic device applications.
Biography:
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 Materials Science and Engineering at UC Davis in July 2006. 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.
Email:
Address:Department of Materials Science and Engineering, 2009 Kemper Hall, Davis, California, United States, 95616