Open AccessPhase transformation, magnetic properties, and exchange bias of Heusler alloy Mn<sub>50–x</sub>Cr<sub>x</sub>Ni<sub>42</sub>Sn<sub>8</sub>
Author(s) -
Algethami Obaidallah A,
李歌天,
柳祝红,
马星桥
Publication year - 2020
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.69.20191551
Subject(s) - materials science , magnetization , ferromagnetism , exchange bias , tetragonal crystal system , austenite , analytical chemistry (journal) , crystallography , condensed matter physics , metallurgy , magnetic field , microstructure , chemistry , magnetic anisotropy , physics , crystal structure , chromatography , quantum mechanics
In this paper, phase transformations, magnetic properties and exchange bias of Mn 50– x Cr x Ni 42 Sn 8 ( x = 0, 0.4, 0.6, 0.8) polycrystalline samples are investigated. It is found that each of all the alloys has a tetragonal martensite structure at room temperature. The transformation temperature decreases with the increase of Cr content. The maximum magnetization difference between martensite and austenite phase is ∆ M = 7.61 emu/g. The change of magnetic properties is mainly related to the change of Mn-Mn distance and the hybridization strength between Ni(A)-Mn(D). The ferromagnetism of martensite can be enhanced by Cr doping. The exchange bias field is observed to reach up to as high as 2624 Oe in Mn 50 Ni 42 Sn 8 alloy after cooling from room temperature to 5 K in 500 Oe magnetic field, which decreases gradually with the increase of Cr content. Furthermore, the exchange bias field increases first and then followed by a decrease with the increase of the cooling field in Mn 49.2 Cr 0.8 Ni 42 Sn 8 . This is mainly attributed to the change of the interface exchange coupling between the spin glass state and antiferromagnetic region.