Paper Title:
Magneto-Transport and Magnetic Properties of Ni-Mn-Ga
  Abstract

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.

  Info
Periodical
Edited by
Lluis Mañosa, P.K. Mukhopadhyay and S.R. Barman
Pages
207-213
DOI
10.4028/www.scientific.net/AMR.52.207
Citation
S. Banik, R. Rawat, P.K. Mukhopadhyay, B.L. Ahuja, A. Chakrabarti, S.R. Barman, "Magneto-Transport and Magnetic Properties of Ni-Mn-Ga", Advanced Materials Research, Vol. 52, pp. 207-213, 2008
Online since
June 2008
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