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0747896_Takamura

Multifunctional Heterostructures of Perovskite Structured Materials Yayoi Takamura, University of California, Davis, DMR 0747896.

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0747896_Takamura

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  1. Multifunctional Heterostructures of Perovskite Structured MaterialsYayoi Takamura, University of California, Davis, DMR 0747896 The interfaces of perovskite oxides materials have been shown to display unexpected functional properties not found in the constituent materials. We have grown perovskite oxide superlattices consisting of alternating sublayers with different chemical and functional properties. Soft x-ray magnetic spectroscopy and microscopy reveal a robust spin-flop coupling which occurs at the interface between the antiferromagnetic (AF) insulator, La0.7Sr0.3FeO3, (LSFO) and the ferromagnetic (FM) metal, La0.7Sr0.3MnO3, (LSMO). This spin-flop coupling is maximized when each sublayer has a thickness of six unit cells (denoted as [6LSMO][6LSFO]5) and it is characterized by the perpendicular orientation of the AF and FM spins in adjacent sublayers. This perpendicular orientation is preserved upon applied magnetic fields and changes in temperature. This interfacial phenomenon provides a means to locally control the direction of the AF spin axis, which is typically defined by structural parameters. Photoemission electron microscopy images of a [6LSMO][6LSFO]5 superlattice showing the correlation between the AF and FM domains in each sublayer. Within each AF domain, two types of FM domains exist such that the AF and FM spins are perpendicular to one another. Submitted to Phys. Rev. B.

  2. Multifunctional Heterostructures of Perovskite Structured MaterialsYayoi Takamura, University of California, Davis, DMR 0747896 The PI is a major sponsor of the UC Davis Science, Technology, Engineering, Mathematics (STEM) Transfer Day. This one-day event brings together prospective transfer students from community colleges with Mathematics Engineering Science Achievement (MESA) programs from around California for a series of workshops and panels to learn about the academic and research opportunities available at UC Davis. The MESA programs are designed to aid educationally disadvantaged students to prepare for and graduate from a four-year college. Furthermore, they have a proportionally higher percentage of students who are under-represented minorities, women, and first generation college attendees. Undergraduate students play an active role in the PI’s research group. This opportunity gives them hands-on experience in applying their lecture material in an advanced laboratory setting. This year, two students gave poster presentations of their work at the UC Davis Undergraduate Research Conference. (top) Hands-on imaging activities and (bottom) Career Discovery Workshop (PI standing at center) at the 2009 UC Davis STEM Transfer Day. (right) Undergraduate students, David Song and Andy Chang at the UC Davis Undergraduate Research Conference

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