Effect of hydrostatic pressure on magneto-crystalline anisotropy of Heusler Ni2MnSn-based alloy

IF 1.2 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
J. Kamarád, J. Kaštil, M. Friák, M. Mazalová, O. Schneeweiss, Z. Arnold
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引用次数: 2

Abstract

ABSTRACT Single crystal of the stoichiometric Ni2MnSn alloy (cubic L21 crystal structure) was prepared by the Czochralski method. The values of the magneto-crystalline anisotropy constant K 1 have been determined at temperature 10 K under ambient and high hydrostatic pressures, K 1 = + 0.17 × 104 and +1.96 × 104 J/m3 (0.7 GPa), respectively. The pressure-induced decrease of magnetization was confirmed and hence the significant non-trivial increase of uniaxial anisotropy with increasing pressure points to a possible distortion of the cubic structure of the single crystal under hydrostatic pressure. Simultaneously, the more pronounced and pressure almost insensitive magneto-crystalline anisotropy, K 1 = + 9.1 × 104 J/m3, has been observed in the martensite phase (orthorhombic structure) of the off-stoichiometric Ni2Mn1.43Sn0.57 alloy. The effect of a directional dependence of the Young modulus that was theoretically derived in the case of the Ni2MnSn-based alloys is discussed.
静水压力对Heusler ni2mnsn基合金磁晶各向异性的影响
采用提拉法制备了化学计量比为Ni2MnSn合金的单晶(立方L21晶体结构)。磁晶各向异性常数K1的值已经在温度10下确定 K在环境和高静水压力下,K 1 = + 0.17 × 104和+1.96 × 104 J/m3(0.7 GPa)。压力引起的磁化强度下降得到了证实,因此单轴各向异性随着压力的增加而显著增加,这表明在静水压力下单晶的立方结构可能发生畸变。同时,更明显和压力几乎不敏感的磁晶各向异性,K1 = + 9.1 × 104 在非化学计量的Ni2Mn1.43Sn0.57合金的马氏体相(正交结构)中已经观察到J/m3。讨论了在Ni2MnSn基合金的情况下从理论上导出的杨氏模量的方向依赖性的影响。
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来源期刊
High Pressure Research
High Pressure Research 物理-物理:综合
CiteScore
3.80
自引率
5.00%
发文量
15
审稿时长
2 months
期刊介绍: High Pressure Research is the leading journal for research in high pressure science and technology. The journal publishes original full-length papers and short research reports of new developments, as well as timely review articles. It provides an important forum for the presentation of experimental and theoretical advances in high pressure science in subjects such as: condensed matter physics and chemistry geophysics and planetary physics synthesis of new materials chemical kinetics under high pressure industrial applications shockwaves in condensed matter instrumentation and techniques the application of pressure to food / biomaterials Theoretical papers of exceptionally high quality are also accepted.
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