Phase transformation, magnetic properties, and exchange bias of Heusler alloy Mn50–xCrxNi42Sn8

Algethami Obaidallah A; Li Ge-Tian; Liu Zhu-Hong; Ma Xing-Qiao

doi:10.7498/aps.69.20191551

Abstract

In this paper, phase transformations, magnetic properties and exchange bias of Mn_50–xCr_xNi₄₂Sn₈ (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 Mn₅₀Ni₄₂Sn₈ 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_49.2Cr_0.8Ni₄₂Sn₈. This is mainly attributed to the change of the interface exchange coupling between the spin glass state and antiferromagnetic region.

Keywords:

Authors and contacts

Department of Physics, University of Science and Technology Beijing, Beijing 100083, China

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

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References

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图 1 Mn_50–xCr_xNi₄₂Sn₈(x = 0, 0.4, 0.6, 0.8)多晶样品在室温下的XRD图谱

Figure 1. XRD patterns for Mn_50–xCr_xNi₄₂Sn₈(x = 0, 0.4, 0.6, 0.8) polycrystalline samples measured at room temperature.

DownLoad: Full-Size Img PowerPoint

图 2 Mn_50–xCr_xNi₄₂Sn₈ (x = 0, 0.4, 0.6, 0.8)多晶样品在100 Oe下的升温热磁曲线, 插图为阴影部分的局部放大图

Figure 2. Temperature dependence of magnetization upon field heating procedures in the field of 100 Oe for Mn_50–xCr_xNi₄₂Sn₈(x = 0, 0.4, 0.6, 0.8) polycrystalline samples, and inset shows magnification of the shadow part.

DownLoad: Full-Size Img PowerPoint

图 3 (a) Mn_50–xCr_xNi₄₂Sn₈ (x = 0.4, 0.6, 0.8)多晶样品的马氏体逆相变温度T_M及马氏体相的居里温度$ T_{\rm C}^{\rm M} $与Cr含量的关系, 以及(b) T_M与价电子浓度、(c)晶胞体积和(d) Ni-Mn原子间距的关系

Figure 3. (a) Cr content dependence of Curie temperature of martensite phase $ T_{\rm C}^{\rm M} $ and martensitic transformation temperature T_M, (b) T_M as a function of valence electron concentration, (c) cell volume, and (d) the distance between Ni and Mn at D site for Mn_50–xCr_xNi₄₂Sn₈ (x = 0.4, 0.6, 0.8).

DownLoad: Full-Size Img PowerPoint

图 4 Mn_50–xCr_xNi₄₂Sn₈(x = 0.4, 0.6, 0.8)多晶样品在20 kOe下的升温热磁曲线

Figure 4. Temperature dependence of magnetization upon heating procedures in field of 20 kOe for Mn_50–xCr_xNi₄₂Sn₈ (x = 0.4, 0.6, 0.8).

DownLoad: Full-Size Img PowerPoint

图 5 Mn₅₀Ni₄₂Sn₈奥氏体与马氏体原子的占位示意图

Figure 5. The sketched unit cells of the austenite and martensite structures.

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图 6 (a) Mn_50–xCr_xNi₄₂Sn₈(x = 0, 0.6, 0.8)多晶样品在500 Oe磁场中冷却至5 K下的磁滞回线及局部放大图; (b) H_C和H_EB与Cr含量的关系

Figure 6. (a) Magnetization hysteresis loops for Mn_50–xCr_xNi₄₂Sn₈(x = 0, 0.6, 0.8) polycrystalline samples measured at 5 K after 500 Oe field cooling, inset shows the magnification of the shadow part; (b) the values of H_C and H_EB as a function of Cr content.

DownLoad: Full-Size Img PowerPoint

图 7 (a) Mn_49.2Cr_0.8Ni₄₂Sn₈多晶样品在不同场冷至5 K下的磁滞回线及局部放大图; (b) H_C和H_EB与不同场冷之间的关系

Figure 7. (a) Magnetization hysteresis loops for Mn_49.2Cr_0.8Ni₄₂Sn₈ polycrystalline sample measured at 5 K after different field cooling, inset shows the magnification of the shadow part; (b) the values of H_C and H_EB under different cooling field.

DownLoad: Full-Size Img PowerPoint

表 1 Mn_50–xCr_xNi₄₂Sn₈(x = 0, 0.4, 0.6, 0.8) 多晶样品在室温下的晶格参数、晶轴比c/a与晶胞体积

Table 1. Lattice parameters, c/a, and cell volume of Mn_50–x Cr_xNi₄₂Sn₈ (x = 0, 0.4, 0.6, 0.8) polycrystalline samples at room temperature.

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

DownLoad: CSV

表 2 Mn_50–xCr_xNi₄₂Sn₈ (x = 0, 0.4, 0.6, 0.8)多晶样品中Mn_(D)-Ni_(A), Mn_(B)-Mn_(A)和Mn_(B)-Mn_(D)的原子间距

Table 2. The atomic distance of Mn_(D)-Ni_(A), Mn_(B)-Mn_(A),and Mn_(B)-Mn_(D)in Mn_50–xCr_xNi₄₂Sn₈(x = 0, 0.4, 0.6, 0.8) polycrystalline samples.

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

DownLoad: CSV

[1]	Meiklejohn W H, Bean C P 1956 Phys. Rev. 102 1413 Google Scholar
[2]	Sharma J, Suresh K G 2014 IEEE Trans. Magn. 50 4800404
[3]	Ali M, Adie P, Marrows C H, Greig D, Hickey B J, Stamps R L 2007 Nat. Mater. 6 70 Google Scholar
[4]	Ma L, Wang W H, Lu J B, Li J Q, Zhen C M, Hou D L, Wu G H 2011 Appl. Phys. Lett. 99 182507 Google Scholar
[5]	Vasilakaki M, Trohidou K N, Nogués J 2015 Sci. Rep. 5 9609 Google Scholar
[6]	Parkin S, Xin J, Kaiser C, Panchula A, Roche K, Samant M 2003 Proc. IEEE 91 661 Google Scholar
[7]	Park B G, Wunderlich J, Martí X, Holý V, Kurosaki Y, Yamada M, Yamamoto H, Nishide A, Hayakawa J, Takahashi H, Shick A B, Jungwirth T 2011 Nat. Mater. 10 347 Google Scholar
[8]	Gasi T, Nayak A K, Winterlik J, Ksenofontov V, Adler P, Nicklas M, Felser C 2013 Appl. Phys. Lett. 102 202402 Google Scholar
[9]	Nogués J, Schuller I K 1999 J. Magn. Magn. Mater. 192 203 Google Scholar
[10]	Parkin S S 2004 IEEE International Electron Devices Meeting, IEDM Technical Digest San Francisco, CA, December 13–15, 2004 pp903–906
[11]	Khan M, Dubenko I, Stadler S, Ali N 2007 Appl. Phys. Lett. 91 072510 Google Scholar
[12]	Esakki Muthu S, Rama Rao N, Sridhara Rao D, Manivel Raja M, Devarajan U, Arumugam S 2011 J. Appl. Phys. 110 023904 Google Scholar
[13]	Xuan H, Cao Q, Zhang C, Ma S, Chen S, Wang D, Du Y 2010 Appl. Phys. Lett. 96 202502 Google Scholar
[14]	Sharma J, Suresh K G 2015 Appl. Phys. Lett. 106 072405 Google Scholar
[15]	Wang B M, Liu Y, Ren P, Xia B, Ruan K B, Yi J B, Ding J, Li X G, Wang L 2011 Phys. Rev. Lett. 106 077203 Google Scholar
[16]	Wang B M, Liu Y, Xia B, Ren P, Wang L 2012 J. Appl. Phys. 111 043912 Google Scholar
[17]	Nayak AK, Nicklas M, Chadov S, Shekhar C, Skourski Y, Winterlik J, Felser C 2013 Phys. Rev. Lett. 110 127204 Google Scholar
[18]	Wang X, Li M M, Li J, Yang J Y, Ma L, Zhen C M, Hou D L, Liu E K, Wang W H, Wu G H 2018 Appl. Phys. Lett. 113 212402 Google Scholar
[19]	Ray M K, Maji B, Modak M, Banerjee S 2017 J. Magn. Magn. Mater. 429 110 Google Scholar
[20]	Liao X, Wang Y, Wetterskog E, Cheng F, Hao C, Khan M T, Zheng Y Z, Yang S 2019 J. Alloys Compd. 772 988 Google Scholar
[21]	Luo H, Liu G, Feng Z, Li Y, Ma L, Wu G, Zhu X, Jiang C, Xu H 2009 J. Magn. Magn. Mater. 321 4063 Google Scholar
[22]	Khan M, Dubenko I, Stadler S, Jung J, Stoyko S S, Mar A, Quetz A, Samanta T, Ali N, Chow K H 2013 Appl. Phys. Lett. 102 112402 Google Scholar
[23]	Sharma V K, Chattopadhyay M K, Sharath Chandra LS, Roy S B 2011 J. Phys. D: Appl. Phys. 441 45002
[24]	Sánchez-Alarcos V, Recarte V, Pérez-Landazábal J I, Chapelon J R, Rodríguez-Velamazán J A 2011 J. Phys. D: Appl. Phys. 44 395001 Google Scholar
[25]	葛青, 冯国芳, 马胜灿 2017 中国材料进展 36 640 Ge Q, Feng G F, Ma S C 2017 Mater. China 36 640
[26]	Priolkar K R, Lobo D N, Bhobe P A, Emura S, Nigam A K 2011 Europhys. Lett. 94 38006 Google Scholar
[27]	申建雷, 李萌萌, 赵瑞斌, 李国科, 马丽, 甄聪棉, 候登录 2016 物理学报 65 247501 Google Scholar Shen J L, Li M M, Zhao R B, Li G Ke, Ma L, Zhen C M, Hou D L 2016 Acta Phys. Sin. 65 247501 Google Scholar
[28]	Kasper J S, Roberts B W 1956 Phys. Rev. 101 537 Google Scholar
[29]	Tan C L, Huang Y W, Tian X H, Jiang J X, Cai W 2012 Appl. Phys. Lett. 100 132402 Google Scholar
[30]	Singh N, Borgohain B, Srivastava A K, Dhar A, Singh H K 2016 Appl. Phys. A 122 237
[31]	Zhang Y, Li J, Tian F, Cao K, Wang D, Ren S, Zhou C, Yang S, Song X 2019 Intermetallics 107 10 Google Scholar
[32]	Sun J K, Jing C, Liu C Q, Huang Y S, Sun X D, Zhang Y L, Ye M F, Deng D M 2019 J. Supercond. Novel Magn. 32 1973 Google Scholar
[33]	Chen J, Tu R, Fang X, Gu Q, Zhou Y, Cui R, Han Z, Zhang L, Fang Y, Qian B, Zhang C 2017 J. Magn. Magn. Mater. 426 708 Google Scholar

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Phase transformation, magnetic properties, and exchange bias of Heusler alloy Mn_50–xCr_xNi₄₂Sn₈