NJ Mellors
Magnetic anisotropy and the shape memory phase transition in Ni52Mn26Ga22
Mellors, NJ; Lord, JS; Robertson, S; Faunce, CA; Grundy, PJ; Lord, DG; Donnier-Valentin, G; Cugat, O
Authors
JS Lord
S Robertson
CA Faunce
PJ Grundy
DG Lord
G Donnier-Valentin
O Cugat
Abstract
Torque measurements of magnetocrystalline anisotropy energies, made on (1 0 0) and (1 1 0) oriented planar disc samples of the shape memory alloy Ni52Mn26Ga22 as a function of temperature and applied directional field cooling are reported. The results confirm small values for the anisotropy constants in the austenite phase (Phys. Rev. B 65 (2002) 134422). Optical observations reveal the influence of applied stresses and magnetic fields on the mobility of the phase transition and twin boundaries. Lorentz mode TEM observations from a (1 1 0) planar foil reveal the interactions between magnetic and anti-phase domain boundaries as the specimen is thermally cycled through the transition temperature.
| Journal Article Type | Article |
|---|---|
| Publication Date | May 1, 2004 |
| Deposit Date | Aug 22, 2007 |
| Journal | Journal of Magnetism and Magnetic Materials |
| Print ISSN | 0304-8853 |
| Publisher | Elsevier |
| Peer Reviewed | Peer Reviewed |
| Volume | 272-27 |
| Issue | 3 |
| Pages | 2108-2110 |
| DOI | https://doi.org/10.1016/j.jmmm.2003.12.1376 |
| Keywords | Magnetic shape memory; Ni2MnGa |
| Publisher URL | http://dx.doi.org/10.1016/j.jmmm.2003.12.1376 |