Unusual magnetic anisotropy in the ferromagnetic shape-memory alloy Ni50Fe23Ga27

Unusual magnetic anisotropy in the ferromagnetic shape-memory alloy Ni50Fe23Ga27
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铁磁形状记忆合金 Ni50Fe23Ga27 中异常的磁各向异性

DOI:
10.1063/1.3671666
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发表时间:
2011-12
期刊:
Appl. Phys. Lett.
影响因子:
--
通讯作者:
X. Fu
X. Fu
中科院分区:
其他
文献类型:
--
作者:
J. F. Qian;E. K. Liu;L. Feng;W. Zhu;G. J. Li;W. H. Wang;G. H. Wu;Z. W. Du;X. Fu

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观察到铁磁形状记忆合金Ni 50 Fe 23 Ga 27的异常磁各向异性。奥氏体的各向异性变得很大,甚至大于带状试样中马氏体的各向异性。当温度从300 K降低到80 K时,奥氏体的饱和磁场从200 Oe急剧增加到6 kOe。这种高各向异性行为清楚地突出了马氏体相变的退磁效应。物理机制是由于集体效应来自原子无序,预马氏体相变,和非化学计量的Ga丰富的合金组合物。(C)2011年美国物理学会。[doi:10.1063/1.3671666]
Unusual magnetic anisotropy of the ferromagnetic shape-memory alloy Ni50Fe23Ga27 has been observed. The anisotropy of the austenite becomes very large, even larger than that of the martensite in ribbon samples. Lowering the temperature from 300K to 80K, the saturation field of the austenite is dramatically increased from 200 Oe up to 6 kOe. This high-anisotropy behavior clearly highlights the demagnetization effect of the martensitic transformation. The physical mechanism is attributed to a collective effect coming from the atomic disorder, the premartensitic transformation, and the off-stoichiometric Ga-rich composition of the alloys. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3671666]
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发表时间: 2011-02
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