Structural and magnetic properties of Ni2MnGa
- 1. Trinity Coll., Dublin (Ireland). Dept. of Phys.
- 2. Institut fuer Physikalische Chemie, Universitaet Wien, Waehringerstr. 42, A-1090, Wien (Austria)
- 3. Low Temperature Physics Department, Moscow State University, 119899 Moscow (Russian Federation)
Description
The martensitic phase transition from a cubic to a tetragonal structure on cooling in the shape-memory ferromagnetic Heusler alloy Ni2MnGa is investigated. The martensitic-transition temperature TM, known to be 205 K for the nominal composition, was expected to increase with increasing Ni content of the alloy. For the samples Ni2(1+δ)Mn1-δGa1-δ with δ=0, 0.046 and 0.10, respectively, the Curie temperature has been determined as 380 K independent of composition. TM for the sample with δ=0.046 is also near 205 K, but the sample with δ=0.10 is single phase and remains tetragonal up to the Curie temperature. The spontaneous polarization of this magnetically uniaxial phase has been determined to be Js=0.16 T and an estimate of the magnetocrystalline anisotropy constant is K1∼80 kJm-3. (orig.)
Additional details
Publishing Information
- Journal Title
- Journal of Magnetism and Magnetic Materials
- Journal Volume
- 167
- Journal Issue
- 1-2
- Journal Page Range
- p. L7-L11.
- ISSN
- 0304-8853
- CODEN
- JMMMDC
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- Netherlands
- INIS RN
- 28033193
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- CRYSTAL STRUCTURE; FERROMAGNETIC MATERIALS; GALLIUM ALLOYS; MAGNETIC PROPERTIES; MAGNETIC SUSCEPTIBILITY; MAGNETIZATION; MANGANESE ALLOYS; NICKEL ALLOYS; SCANNING ELECTRON MICROSCOPY; X-RAY DIFFRACTION
- Descriptors DEC
- ALLOYS; COHERENT SCATTERING; DIFFRACTION; ELECTRON MICROSCOPY; MAGNETIC MATERIALS; MAGNETIC MOMENTS; MATERIALS; MICROSCOPY; PHYSICAL PROPERTIES; SCATTERING; TRANSITION ELEMENT ALLOYS