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Applied Physics Letters / Volume 96 / Issue 9 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 96, 092511 (2010); http://dx.doi.org/10.1063/1.3330942 (3 pages)

Co-concentration dependence of half-metallic properties in Co–Mn–Si epitaxial films

Y. Sakuraba1, N. Hirose2, M. Oogane2, T. Nakamura3, Y. Ando2, and K. Takanashi1

1Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
2Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aoba-yama 6-6-05, Aramaki, Aoba-ku, Sendai 980-8579, Japan
3Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, Koto 1-1-1, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan

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(Received 27 December 2009; accepted 1 February 2010; published online 3 March 2010)

Co-enriched Co2MnSi epitaxial films, i.e., Co2(1+x)Mn1−xSi1−x (CCMS) were fabricated to investigate the Co-concentration dependence of half-metallicity in a Co–Mn–Si Heusler alloy. The tunnel magnetoresistance ratio in the magnetic tunnel junctions with a CCMS electrode slightly reduces with x from −0.02 to 0.13, then suddenly drops at x = 0.20. The half-metallic gap in the G-V curve also disappears when x becomes 0.20. The multiplet structure in x-ray magnetic circular dichroism spectra around Co L-edges, implying half-metallicity of CCMS, also vanishes at x = 0.20. These results consistently indicate the half-metallic nature of CCMS is destroyed when the Co atomic concentration is over 57 at. %.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

cobalt alloys, electrodes, epitaxial layers, magnetic circular dichroism, magnetic tunnelling, manganese alloys, silicon alloys

PACS

  • 78.20.Ls

    Magneto-optical effects

  • 68.55.-a

    Thin film structure and morphology

  • 75.70.Cn

    Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3330942

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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    S. Tsunegi, Y. Sakuraba, M. Oogane, K. Takanashi, and Y. Ando, Appl. Phys. Lett. 93, 112506 (2008)APPLAB000093000011112506000001.

    T. Ishikawa, T. Marukame, H. Kijima, K. -I. Matsuda, T. Uemura, M. Arita, and M. Yamamoto, Appl. Phys. Lett. 89, 192505 (2006)APPLAB000089000019192505000001.

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