Temperature Dependent Magnetic and Structural Properties of Ni-Mn-Ga Heusler Alloy Glass-Coated Microwires
S. Shevyrtalova, K. Chichay a, P. Ershov a, V. Khovaylob,c, A. Zhukovd,e, V. Zhukova d and V. Rodionovaa,b
aInnovation Park and Institute of Physics and Technology, Immanuel Kant Baltic Federal University, Kaliningrad 236041, Russia
bNational University of Science and Technology MISiS, Moscow 119049, Russia
cITMO University, St. Petersburg 197101, Russia
dDpto. Fisica de Materiales, Fac. Quimicas, sUPV/EHU, 20009 San Sebastian, Spain
eIKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain
Full Text PDF
We report on structural and magnetic properties of glass-coated microwires of Ni-Mn-Ga-based Heusler alloys. Structural characterization of the as-prepared microwires revealed that they have a cubic structure at room temperature. It is shown that magnetic properties of microwires can be tailored by heat treatment as well as by removing the glass coating. Specifically, annealing of the microwires has a marked influence of the Curie temperature TC which increases significatly in the heat-treated samples. Release of internal stresses in the microwires by removing the glass coating causes magnetization and the Curie temperature to decrease. This allowed us to conclude that in the studied microwires the magnetostriction constant is positive and estimate the value of internal stresses as being roughly equal to 1.5 GPa.

DOI: 10.12693/APhysPolA.127.603
PACS numbers: 75.47.Np, 75.60.Ej, 75.60.Nt