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Applied Physics Letters / Volume 96 / Issue 22 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 96, 222507 (2010); http://dx.doi.org/10.1063/1.3427431 (3 pages)

Magnetic properties and phase stability of L21 phase in Co2Mn(Ga1−xZx)(Z = Si, Ge, and Sn) Heusler alloys

A. Okubo1, R. Y. Umetsu2, K. Kobayashi1, R. Kainuma2, and K. Ishida1

1Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-02 Aoba, Sendai, Miyagi 980-8579, Japan
2Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Sendai, Miyagi 980-8577, Japan

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(Received 11 March 2010; accepted 17 April 2010; published online 3 June 2010)

For the Co2Mn(Ga1−xZx) (Z = Si, Ge, and Sn) Heusler alloys, the L21/B2 order-disorder transition temperature TtL21/B2, the Curie temperature TC, and the saturation magnetization Ms were determined. The TtL21/B2 for all the systems linearly increases with increasing x. Although the TtL21/B2 was not determined in the high x region because of melting of alloys, those of Co2MnGe and Co2MnSn could be estimated by extrapolation from the quaternary data. The Ms at 4.2 K and the TC increase with x, and the Ms for all the systems is in good agreement with the Slater Pauling rule.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

cobalt alloys, Curie temperature, gallium alloys, germanium alloys, manganese, order-disorder transformations, silicon alloys, tin alloys

PACS

  • 75.30.Kz

    Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

  • 64.70.K-

    Solid-solid transitions

  • 64.60.Cn

    Order-disorder transformations

  • 75.40.-s

    Critical-point effects, specific heats, short-range order

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3427431

PUBLICATION DATA

ISSN

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

Publisher

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

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