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Applied Physics Letters / Volume 81 / Issue 9 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 81, 1651 (2002); http://dx.doi.org/10.1063/1.1503405 (3 pages)

Magnetic and electrical properties of Co2MnGa grown on GaAs (001)

S. N. Holmes1 and M. Pepper1,2

1Cambridge Research Laboratory, Toshiba Research Europe Limited, 260. Cambridge Science Park, Cambridge CB4 0WE, United Kingdom
2Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, United Kingdom

(Received 28 May 2002; accepted 8 July 2002)

The Heusler alloys are a group of magnetic materials that will form essential components in hybrid, ferromagnet–semiconductor devices that utilize spin injection. We demonstrate that such an alloy, Co2MnGa:GaAs(001) is ferromagnetic at 300 K and has controllable magnetic properties. A weak in-plane uniaxial anisotropy is observed with the easy axis along the [0,−1,1] direction. Metallic rather than semiconducting behavior is observed over a range of wafer thicknesses. The extrapolated bulk resistivity is 20 μΩ cm at 300 K and the residual resistivity ratios range from 1.15 to 1.7 depending on the wafer thickness. An anisotropic magnetoresistance of 6% at 300 K (and 8% at 1.6 K) demonstrates the importance of spin–orbit scattering in these disordered alloys. Several issues are addressed in this letter as to whether the manifestation of the predicted spin-polarized band structure and minority spin band gap can be observed. © 2002 American Institute of Physics.

© 2002 American Institute of Physics

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KEYWORDS and PACS

Keywords

cobalt alloys, manganese alloys, gallium alloys, ferromagnetic materials, electron spin polarisation, semiconductor-metal boundaries, magnetic anisotropy, electrical resistivity, magnetoresistance, spin-orbit interactions, energy gap, band structure, magnetic thin films, interface magnetism, metallic thin films

PACS

  • 72.25.Mk

    Spin transport through interfaces

  • 73.40.Ns

    Metal-nonmetal contacts

  • 75.50.Cc

    Other ferromagnetic metals and alloys

  • 73.50.Jt

    Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)

  • 75.70.Cn

    Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

  • 73.61.At

    Metal and metallic alloys

  • 71.70.Ej

    Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect

  • 75.30.Gw

    Magnetic anisotropy

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1503405

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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