Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 577, Issue -, Pages S291-S295Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.10.084
Keywords
Magnetostriction; Ferromagnetic shape memory effect; Antiperovskite; Martensite
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Tetragonally distorted antiperovskite Mn3CuN1-delta exhibits huge magnetostriction of up to 2000 ppm, which is reasonably ascribed to ferromagnetic shape memory effects. The uniqueness of Mn3CuN1-delta as a ferromagnetic shape memory alloy is exemplified by its nitrogen deficiency. The easy axis for magnetization rotates from the longer a axis in Mn3CuN0.97 to the shorter c axis in Mn3CuN0.78. The operating magnetic field for magnetostriction is much lower for Mn3CuN0.28 than for Mn3CuN0.92, suggesting supermagnetostriction. These characteristic behaviors can be explained consistently in terms of low magnetocrystalline anisotropy, which is a striking difference from other ferromagnetic shape memory alloys such as Heusler Ni2MnGa. (C) 2011 Elsevier B.V. All rights reserved.
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