ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
We report a detailed investigation of the magneto-transport and magnetic properties ofMn 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, premartensiticand martensitic phases. With Mn doping in Ni2-yMn1+yGa, a decrease in magnetizationand MR has been found, since the doped Mn atoms in Ni position are in the antiferromagneticconfiguration with the Mn atoms in Mn position. MR for the parent stoichiometric compositionNi2MnGa varies almost linearly with field in the austenitic and pre-martensitic phases, and shows acusp-like shape in the martensitic phase. This has been explained by the changes in twin and domainstructures in the martensitic phase. Hysteresis in the heating and cooling cycles is a characteristic ofthe first order nature of the martensitic phase transition
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.52.207.pdf
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