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Are half-metallic ferromagnets half metals? (invited)

J. Appl. Phys. 95, 7453 (2004); doi:10.1063/1.1682911

Issue Date: 1 June 2004

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P. A. Dowben and R. Skomski
Department of Physics and Astronomy and the Center for Materials Research and Analysis (CMRA), Behlen Laboratory of Physics, University of Nebraska, P.O. Box 880111, Lincoln, Nebraska 68588-0111
Several classes of materials are currently under investigation as potential high-spin-polarization materials. Unfortunately, the proposed half-metallic materials, including the semi-Heusler alloys, the manganese perovskites, and the "simpler" oxides such as chromium dioxide and magnetite, suffer from fundamental limitations. First, the postulated half-metallic systems lose their full (T = 0) spin polarization at finite temperatures and, second, surfaces, interfaces, and structural inhomogenities destroy the complete spin polarization of half-metallic systems even at zero temperature. In a strict sense, half-metallic ferromagnetism is limited to zero temperature since magnon and phonon effects lead to reductions in polarization at finite temperatures. ©2004 American Institute of Physics.
History: Presented 9 January 2004
Permalink: http://link.aip.org/link/?JAPIAU/95/7453/1
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KEYWORDS and PACS

Keywords
PACS
  • 75.50.Dd
    Nonmetallic ferromagnetic materials
  • 75.30.Ds
    Spin waves in magnetically ordered materials
  • 72.20.My
    Galvanomagnetic and other magnetotransport effects (semiconductors/insulators)
  • 75.47.-m
    Magnetotransport phenomena; materials for magnetotransport
  • YEAR: 2004

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0021-8979 (print)   1089-7550 (online)
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