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Atomic disorder in Heusler Co2MnGe measured by anomalous x-ray diffraction

Appl. Phys. Lett. 81, 2812 (2002); doi:10.1063/1.1513216

Issue Date: 7 October 2002

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B. Ravel
Naval Research Laboratory, Washington, DC 20375

J. O. Cross
University of Washington, Seattle, Washington 98195

M. P. Raphael and V. G. Harris
Naval Research Laboratory, Washington, DC 20375

R. Ramesh and V. Saraf
University of Maryland, College Park, Maryland 20742
Heusler alloys Co2MnX, where X is Ge or Si, are predicted by the band theory to be a half-metallic ferromagnets, i.e., metals with all conduction electrons of the same spin state. To date, Heusler alloys have been measured with spin polarizations of 50%–60%, higher than Fe (~40%), but not a true half metal. Structural defects involving site swapping between the Co and Mn sublattices have been proposed as a mechanism to diminish spin polarization. In this work, we present an anomalous x-ray diffraction measurement on Co2MnGe to determine antisite disorder in thin films with a high precision. ©2002 American Institute of Physics.
History: Received 24 June 2002; accepted 19 August 2002
Permalink: http://link.aip.org/link/?APPLAB/81/2812/1
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KEYWORDS and PACS

Keywords
PACS
  • 68.55.Jk
    Surfaces and interfaces; thin films and low-dimensional systems (structure and nonelectronic properties) Thin film structure and morphology Structure and morphology; thickness; crystalline orientation and texture
  • 68.55.Ln
    Surfaces and interfaces; thin films and low-dimensional systems (structure and nonelectronic properties) Thin film structure and morphology Defects and impurities: doping, implantation, distribution, concentration, etc.
  • 75.50.Cc
    Magnetic properties and materials Studies of specific magnetic materials Other ferromagnetic metals and alloys
  • 61.72.Ji
    Structure of solids and liquids; crystallography Defects and impurities in crystals; microstructure Point defects (vacancies, interstitials, color centers, etc.) and defect clusters
  • 75.70.Ak
    Magnetic properties and materials Magnetic properties of thin films, surfaces, and interfaces Magnetic properties of monolayers and thin films
  • YEAR: 2002

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (13)
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