Abstract
We report a systematic investigation of the magnetic behaviour of a series of Ni50−xCoxMn40Sn10 alloys (x = 3, 5, 7, and 9 at.%) fabricated by spark plasma sintering of ball-milled powder mixtures. The presence of superspin-glass martensite was unambiguously confirmed using ageing and memory effect experiments in x = 3, which exhibits a metamagnetic transition at 125 K. Moreover, the Ni2MnSn austenite → martensite transformation (MT) temperature decreased with an increasing Co content and was absent in x = 9. Nevertheless, both the lattice parameter and the Curie temperature (\({T}_{C}^{A})\) of the austenite have increased monotonically with an increase of x. A bifurcation between the zero-field cooled and field cooled magnetization curve was observed in x = 3 and x = 5 at 220 K and 290 K, respectively. The isothermal magnetization study at 260 K confirmed the ferromagnetic nature of Ni2MnSn austenite.
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The authors would like to thank Mr. S. Maity and Mr. R. Bosu at the Central Research Facility, IIT Kharagpur, for technical assistance.
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The authors would like to acknowledge the financial support by Sponsored Research and Industrial Consultancy (SRIC), IIT Kharagpur, through SGBSI.
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Anand, K.S., Goswami, D. & Das, J. Observation of superspin-glass behaviour and metamagnetic transition in spark plasma-sintered Ni50−xCoxMn40Sn10 (x = 3, 5, 7, and 9 at.%). Journal of Materials Research 37, 1513–1519 (2022). https://doi.org/10.1557/s43578-022-00559-5
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DOI: https://doi.org/10.1557/s43578-022-00559-5