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arXiv 1006.0071cond-mat.str-el
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NiCoMnSb Heusler合金交换偏置增强行为的观察

Observation of enhanced exchange bias behavior in NiCoMnSb Heusler alloys

Ajaya K. Nayak, K. G. Suresh, A. K. Nigam

摘要:

本文报道了在Ni_(50-x)Co_xMn_(38)Sb_(12)Heusler合金(x=0,2,3,4,5)中观察到的大的交换偏置,这是由于马氏体相中铁磁相和反铁磁相共存所致。高温铁磁相和马氏体相中占优势的反铁磁相的过冷可能是相共存的原因。交换偏差的存在得到了训练效应的观察的支持。交换偏置场随Co浓度的增加而增大。在50 kOe的场冷条件下,x=5时,T= 3 K时的最大值为480 Oe,几乎是Heusler合金系统中迄今为止所报道的最高值的两倍。Co取代后反铁磁耦合的增加被认为是负责的交换偏置的增加。

英文摘要:

We report the observation of large exchange bias in Ni50-xCoxMn38Sb12 Heusler alloys with x=0, 2, 3, 4, 5, which is attributed to the coexistence of ferromagnetic and antiferromagnetic phases in the martensitic phase. The phase coexistence is possibly due to the supercooling of the high temperature ferromagnetic phase and the predominant antiferromagnetic component in the martensitic phase. The presence of exchange bias is well supported by the observation of training effect. The exchange bias field increases with Co concentration. The maximum value of 480 Oe at T=3K is observed in x=5 after field cooling in 50 kOe, which is almost double the highest value reported so far in any Heusler alloy system. Increase in the antiferromagnetic coupling after Co substitution is found to be responsible for the increase in the exchange bias.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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