Influence of grain refinement and induced crystal defects on the magnetic properties of Ni50Mn36Sn14 Heusler alloy

被引：26
作者：
Alves, A. L. [1 ]
Passamani, E. C. [1 ]
Nascimento, V. P. [1 ]
Takeuchi, A. Y. [1 ]
Larica, C. [1 ]
机构：
[1] Univ Fed Espirito Santo, Dept Fis, BR-29075910 Vitoria, ES, Brazil
来源：
JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2010年 / 43卷 / 34期
关键词：
MEMORY; DIFFRACTION; NI2MNGA; SEARCH; SN;
D O I：
10.1088/0022-3727/43/34/345001
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The effect of high energy ball milling on the structural, magnetic and magnetocaloric properties of Ni50Mn36Sn14 Heusler-type alloy has been studied. X-ray diffraction results have revealed a reduction in the crystalline grain size concomitantly with defect inclusions in the crystalline lattice, favouring a chemical disorder effect that transforms the L2(1)-B2-type disordered structure to a simple cubic B2-type structure for increasing milling time. From magnetometry and Mossbauer spectroscopy results, a decrease in the ferromagnetic exchange interaction contribution, an enhancement of the effective exchange bias field and a significant reduction in the magnetic entropy change of the milled alloy are observed.
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页数：9
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