Magnetic Properties of CoFe2O4 Nanopillars

ORAL

Abstract

Ferrimagnetic CoFe$_{2}$O$_{4}$ spontaneously forms nanopillars embedded in a BaTiO$_{3}$ or BiFeO$_{3}$ matrix during thin film growth by pulsed laser deposition. Such thin film nanostructures show three dimensional heteroepitaxy. All the films have a large uniaxial magnetic anisotropy with an easy axis normal to the film plane. It is calculated that stress anisotropy is the main contribution to the anisotropy field. We studied the magnetic behavior of the CoFe$_{2}$O$_{4}$ nanopillars formed at different growth temperatures, with different film thickness and on various substrates.

*This work is supported by an ONR MURI program at UC Berkeley

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Authors

  • H. Zheng

    • U C Berkeley

  • Rajesh Chopdekar

    • Cornell Univ.
    • Applied Physics, Cornell University
    • School of Applied Physics, Cornell Univ.

  • Yayoi Takamura

  • T. Zhao

    • Dept of Materials Science and Dept of Physics, University of California, Berkeley CA 94720

  • Yuri Suzuki

    • UC-Berkeley
    • Materials Science, UC Berkeley
    • Dept. of Materials Science and Engineering, UC Berkeley
    • Dept. of Materials Science \& Eng., UC Berkeley

  • Ramamoorthy Ramesh

    • Dept. of Materials Science and Engineering, and Dept. of Physics, Univ. of California, Berkeley CA 94720
    • Dept of Materials Science and Physics, University of California, Berkeley CA 94720
    • Univeristy of California, Berkeley
    • U C Berkeley
    • University of California, Berkeley

  • F. Zavaliche

  • L. Mohaddes-Ardahili

  • S.R. Shinde

  • S.B. Ogale

    • Univeristy of Maryland, College Park
    • University of Maryland

  • D.G. Schlom

    • Dept. of Materials Science and Engineering, Pennsylvania State University
    • Pennsylvania State University
    • Penn State University