2D patterned ferromagnetic semiconductors for planar spintronics

ORAL

Abstract

Fabrication of III-Mn-V ferromagnetic semiconductors by way of Mn ion implantation followed by pulsed laser melting (II-PLM) allows for the unique possibility of lateral patterning using optical and e-beam lithography. We have performed II-PLM on resist patterned substrates to create isolated ferromagnetically active Ga$_{1-x}$Mn$_{x}$As regions embedded in a GaAs substrate. We have prepared a uniform Ga$_{1-x}$Mn$_{x}$As film as well as a sample patterned with an array of Mn$^{+}$-implanted 100$\mu $m x 100$\mu $m squares that covers the equivalent of one-quarter the sample. The saturation magnetization of the patterned sample reflects this one-quarter implant area, and both samples display a T$_{C}$ of $\sim $100 K suggesting a similar maximum Mn concentration. The electrical and magnetic properties of this and other lateral structures consisting of sub-micron spaced active regions will be presented. This work was supported by the U.S. Department of Energy under contract No. DE-AC02-05CH11231.

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Authors

  • Rouin Farshchi

  • I.D. Sharp

    • Materials Science and Engineering, University of California, Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory, CA 94720

  • Mike Scarpulla

  • E.E. Haller

    • Materials Sciences Div., Lawrence Berkeley National Laboratory, and Dept. of Materials Science and Engineering, University of California, Berkeley, CA
    • Materials Science and Engineering, University of California, Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory, CA 94720

  • Oscar Dubon

    • Dept. of Materials Science and Engineering, University of California and Lawrence Berkeley National Laboratory, Berkeley CA 94720
    • Univ. of California, Berkeley, CA 94720, Berkeley Lab, Berkeley, CA 94720

  • Jeffrey Beeman

    • Berkeley Lab, Berkeley, CA 94720

  • Soonjoo Seo

  • Paul Evans

    • University of Wisconsin-Madison
    • Univ. of Wisconsin, Madison, WI 53706