Open AccessStructure, magnetism, and electron-transport properties of Mn2CrGa-based nanomaterials
Author(s) -
Wenyong Zhang,
Parashu Kharel,
Ralph Skomski,
Shah Valloppilly,
Xingzhong Li,
D. J. Sellmyer
Publication year - 2016
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/1.4944403
Subject(s) - magnetocrystalline anisotropy , condensed matter physics , ferrimagnetism , tetragonal crystal system , materials science , curie temperature , coercivity , magnetoresistance , annealing (glass) , magnetic moment , magnetism , ferromagnetism , magnetic anisotropy , phase (matter) , magnetization , chemistry , metallurgy , magnetic field , physics , organic chemistry , quantum mechanics
Mn2CrGa in the disordered cubic structure has been synthesized using rapid quenching and subsequent annealing. The cubic phase transforms to a stable tetragonal phase when a fraction of Cr or Ga is replaced by Pt or Al, respectively. All samples are ferrimagnetic with high Curie temperatures (Tc); Mn2CrGa exhibits the highest Tc of about 813 K. The tetragonal samples have appreciable values of magnetocrystalline anisotropy energy, which leads to an increase in coercivity (Hc) that approaches about 10 kOe in the Pt-doped sample. The Hc linearly increases with a decrease of temperature, concomitant with the anisotropy change with temperature. All samples are metallic and show negative magnetoresistance with room-temperature resistivities on the order of 1 mΩcm. The magnetic properties including high Tc and low magnetic moment suggest that these tetragonal materials have potential for spin-transfer-torque-based devices
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