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Abstract

In this paper, phase transformations, magnetic properties and exchange bias of Mn _50–xCr _xNi ₄₂Sn 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 ₅₀Ni ₄₂Sn ₈alloy 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 _49.2Cr _0.8Ni ₄₂Sn ₈. This is mainly attributed to the change of the interface exchange coupling between the spin glass state and antiferromagnetic region.

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Corresponding author:Liu Zhu-Hong,zhliu@ustb.edu.cn

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x	a=b/Å	c/Å	c/a	晶胞体积/Å³
0	5.4881	6.9681	1.269	209.87
0.4	5.4966	6.9601	1.266	210.30
0.6	5.5136	6.9463	1.259	210.70
0.8	5.5221	6.9342	1.255	211.50

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Cr含量x	Mn_D-Ni_A/Å ($ \sqrt 3 $a/4)	Mn_B-Mn_A/Å ($ \sqrt 3 $a/4)	Mn_B-Mn_D/Å (a/2)
0	2.376	2.376	2.744
0.4	2.38	2.38	2.748
0.6	2.387	2.387	2.757
0.8	2.391	2.391	2.761

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Vol. 69, Issue 5 - 2020-03-05

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