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Applied Physics Letters / Volume 97 / Issue 6 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 97, 062505 (2010); http://dx.doi.org/10.1063/1.3467460 (3 pages)

Large inverse magnetic entropy changes and magnetoresistance in the vicinity of a field-induced martensitic transformation in Ni50−xCoxMn32−yFeyGa18

Arjun K. Pathak1, Igor Dubenko1, Haluk E. Karaca2, Shane Stadler3, and Naushad Ali1

1Department of Physics, Southern Illinois University, Carbondale, Illinois 62901, USA
2Department of Mechanical Engineering, University of Kentucky, Lexington, Kentucky 40506, USA
3Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA

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(Received 23 May 2010; accepted 1 July 2010; published online 12 August 2010)

Significantly large inverse magnetic entropy changes (ΔSM) and magnetoresistance (MR) were observed at the inverse martensitic phase transitions of the Ga-based magnetic shape memory Heusler alloys: Ni50−xCoxMn32−yFeyGa18. The crystal structures of alloys were tetragonal at 300 K and the phase transition temperatures and magnetic properties were found to be correlated with the degree of tetragonal distortion. The maximum peak values of the ΔSM and MR at H = 5 T were determined as ≈ (+)31 J Kg−1 K−1 and ≈−21%, respectively, for x = 8 and y = 2. The relatively small hysteretic loss and large refrigeration capacity observed in this system make these compounds promising materials for applications.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

cobalt alloys, crystal structure, entropy, ferromagnetic materials, gallium alloys, iron alloys, magnetic hysteresis, magnetoresistance, manganese alloys, martensitic transformations, nickel alloys, shape memory effects

PACS

  • 81.30.Kf

    Martensitic transformations

  • 64.70.kd

    Metals and alloys

  • 61.66.Fn

    Inorganic compounds

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

  • 75.50.Bb

    Fe and its alloys

  • 72.15.Gd

    Galvanomagnetic and other magnetotransport effects

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3467460

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.
    A. K. Pathak, M. Khan, I. Dubenko, S. Stadler, and N. Ali, Appl. Phys. Lett. 90, 262504 (2007)APPLAB000090000026262504000001.

    A. K. Pathak, M. Khan, B. R. Gautam, S. Stadler, I. Dubenko, and N. Ali, J. Appl. Phys. 103, 07F315 (2008)JAPIAU00010300000707F315000001.

    A. N. Vasil'ev, A. D. Bozhko, V. V. Khovailo, I. E. Dikshtein, V. G. Shavrov, V. D. Buchelnikov, M. Matsumoto, S. Suzuki, T. Takagi, and J. Tani, Phys. Rev. B 59, 1113 (1999).

    S. Fabbrici, F. Albertini, A. Paoluzi, F. Bolzoni, R. Cabassi, M. Solzi, L. Righi, and G. Calestani, Appl. Phys. Lett. 95, 022508 (2009)APPLAB000095000002022508000001.

    C. Jiang, J. Wang, P. Li, A. Jia, and H. Xu, Appl. Phys. Lett. 95, 012501 (2009)APPLAB000095000001012501000001.

    S. Y. Yu, Z. X. Cao, L. Ma, G. D. Liu, J. L. Chen, G. H. Wu, B. Zhang, and X. X. Zhang, Appl. Phys. Lett. 91, 102507 (2007)APPLAB000091000010102507000001.

    S. Aksoy, M. Acet, P. P. Deen, L. Mañosa, and A. Planes, Phys. Rev. B 79, 212401 (2009).


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