Phase transitions, magnetotransport and magnetocaloric effects in a new family of quaternary Ni-Mn-In-Z heusler alloys
The magnetic, magnetotransport, and magnetocaloric properties near compound phase transitions in Ni 50Mn 35In 14Z (Z=In, Ge, Al), and Ni 48Co 2Mn 35In 15 Heusler alloys have been studied using VSM and SQUID magnetometers (at magnetic fields (H) up to 5 T), four-probe method (at H = 0.005-1.5 T), and an adiabatic magnetocalorimeter (for H changes up to δH = 1.8 T), respectively. The martensitic transformation (MT) is accompanied by large magnetoresistance (up to 70%), a significant change in resistivity (up to 200%), and a sign reversal of the ordinary Hall effect coefficient, all related to a strong change in the electronic spectrum at the MT. The field dependences of the Hall resistance are complex in the vicinity of the MT, indicating a change in the relative concentrations of the austenite and martensite phases at strong fields. Negative and positive changes in adiabatic temperatures of about -2 K and +2 K have been observed in the vicinity of MT and Curie temperatures, respectively, for δH = 1.8 T. Copyright © 2012 American Scientific Publishers All rights reserved.
Publication Source (Journal or Book title)
Journal of Nanoscience and Nanotechnology
Kazakov, A., Prudnikov, V., Granovsky, A., Perov, N., Dubenko, I., Pathak, A., Samanta, T., Stadler, S., Ali, N., Zhukov, A., Ilyin, M., & Gonzalez, J. (2012). Phase transitions, magnetotransport and magnetocaloric effects in a new family of quaternary Ni-Mn-In-Z heusler alloys. Journal of Nanoscience and Nanotechnology, 12 (9), 7426-7431. https://doi.org/10.1166/jnn.2012.6542