Magnetic noises emitted during martensitic transformation in Ni49Fe18Ga27Co6 single crystalline shape memory alloys

被引：2

作者：

Bolgar, M. K. ^{[1
]}

Daroczi, L. ^{[1
]}

Toth, L. Z. ^{[1
]}

Timofeeva, E. E. ^{[2
]}

Panchenko, E. Y. ^{[2
]}

Chumlyakov, Y. I. ^{[2
]}

Beke, D. L. ^{[1
]}

机构：

[1] Univ Debrecen, Dept Solid State Phys, POB 400, H-4002 Debrecen, Hungary

[2] Tomsk State Univ, Siberian Phys Tech Inst, Novosonornaya Sq 1, Tomsk 634050, Russia

来源：

INTERMETALLICS | 2019年 / 107卷

基金：

俄罗斯科学基金会;

关键词：

Shape-memory alloys; Martensitic transformation; Magnetic properties; NI-FE-GA; AUSTENITE/MARTENSITE TRANSFORMATION;

D O I：

10.1016/j.intermet.2019.01.017

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Magnetic noises during martensitic transformations in single crystalline Ni49Fe15Ga27Co6 (at. %) alloys were measured. The critical exponents of the acoustic and magnetic noises were slightly different from each other in contrast to those obtained in Ni2MnGa single crystals, measured so far. The presence of nano-sized gamma-particles increased the noise activity and resulted in bipolar magnetic noise, in contrast to mostly unipolar signals observed in the homogeneous sample or in Ni2MnGa. Application of a moderate external magnetic field (20.9 mT) decreased the bipolar nature of the noise, which was qualitatively explained by the magnetoelastic coupling and by the more ordered magnetic domain structure. Nano-sized precipitates resulted in more fine steps of the jerky motion of the interface and caused barriers against of the easy development of the magnetic structure.

引用

页码：103 / 107

页数：5

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