Magneto-Transport and Magnetic Properties of Ni-Mn-Ga
| Periodical | Advanced Materials Research (Volume 52) |
|---|---|
| Main Theme | Ferromagnetic Shape Memory Alloys |
| Edited by | Lluis Mañosa, P.K. Mukhopadhyay and S.R. Barman |
| Pages | 207-213 |
| DOI | 10.4028/www.scientific.net/AMR.52.207 |
| Citation | Soma Banik et al., 2008, Advanced Materials Research, 52, 207 |
| Online since | June, 2008 |
| Authors | Soma Banik, R. Rawat, P.K. Mukhopadhyay, B.L. Ahuja, Aparna Chakrabarti, S.R. Barman |
| Keywords | Magnetic Shape Memory Alloy (MSMA), Magnetoresistivity MR, Martensitic Transition |
| Price | US$ 28,- |
We report a detailed investigation of the magneto-transport and magnetic properties of Mn excess Ni-Mn-Ga using the resistivity and magnetization measurements. Magnetoresistance (MR) has been measured in the ferromagnetic state for different compositions in the austenitic, premartensitic and martensitic phases. With Mn doping in Ni2-yMn1+yGa, a decrease in magnetization and MR has been found, since the doped Mn atoms in Ni position are in the antiferromagnetic configuration with the Mn atoms in Mn position. MR for the parent stoichiometric composition Ni2MnGa varies almost linearly with field in the austenitic and pre-martensitic phases, and shows a cusp-like shape in the martensitic phase. This has been explained by the changes in twin and domain structures in the martensitic phase. Hysteresis in the heating and cooling cycles is a characteristic of the first order nature of the martensitic phase transition.
