Magnetic phases in thin films of Ni-Fe(Co)-Ga ferromagnetic shape memory alloy

被引：3

作者：

Chernenko, V. A. ^{[1
,2
,3
]}

Aseguinolaza, I. R. ^{[1
,2
]}

Golub, V. ^{[4
,5
]}

Salyuk, O. Y. ^{[4
,5
]}

Barandiaran, J. M. ^{[1
,2
]}

机构：

[1] BCMat, Bilbao 48080, Spain

[2] Univ Basque Country, UPV EHU, Bilbao 48080, Spain

[3] Basque Fdn Sci, Ikerbasque, Bilbao 48013, Spain

[4] NASU, Inst Magnetism, UA-03142 Kiev, Ukraine

[5] MESYSU, UA-03142 Kiev, Ukraine

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2017年 / 50卷 / 45期

关键词：

Ni49.7Fe17.4Co4.2Ga28.7 ferromagnetic shape memory film; martensitic transformation; ferromagnetic resonance; MARTENSITIC-TRANSFORMATION; GA; MICROACTUATORS;

D O I：

10.1088/1361-6463/aa8aea

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

1 mu m-thick polycrystalline thin films of the ferromagnetic shape memory alloy, Ni49.7Fe17.4Co4.2Ga28.7 (at.%), were sputter-deposited on MgO(001) substrates heated at 773 K. The films' structure, magnetic properties and transformation behavior have been characterized. They exhibit both forward and reverse martensitic transformations at 218 K and 232 K, respectively. Ferromagnetic resonance and x-ray diffraction measurements discerned three ferromagnetic phases: cubic L2(1)-ordered austenite, tetragonal martensite and disordered cubic gamma-phase. The latter phase showed a unique spin- waves resonance spectrum, enabling estimation of the value of the exchange stiffness constant equal to A = 0.7 x 10(-6) erg cm(-1).

引用

页数：5

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