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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Deformation induced thermoremanent magnetisation in an FeMnNiCr antiferromagnetic alloy
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Deformation induced thermoremanent magnetisation in an FeMnNiCr antiferromagnetic alloy

机译：FeMnNiCr反铁磁合金中的变形诱导的热剩磁

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摘要

In an austenitic Fe_(61.5)Mn_(23)Ni_7Cr_(8.5) antiferromagnetic (afm) alloy deformation results in a splitting between magnetisation-vs.-temperature curves measured during field cooling (FC) below the Neel temperature and those measured at the same field after zero-field cooling (ZFC). Furthermore, a thermoremanent magnetisation (TRM) appears that corresponds to the splitting between zero-field and field cooled thermomagnetic measurements for a given cooling field and scales with the degree of deformation. This TRM is attributed to the deformation induced defects which act as a source of uncompensated magnetic moments and interact with the bulk afm moments. This interpretation is also supported by the fact that the net magnetic moments vanish above the Neel temperature. The TRM does not saturate in fields of up to 7T, applied during cooling, and cannot be switched by fields up to 7T. Within the investigated field range of -7 T to 7 T the magnetisation-vs.-field curves show a stable shift along the magnetisation axis. Thus, the uncompensated moments appear to be strongly exchange coupled to the afm matrix surrounding them. Within the series of experiments the maximum TRM reached after FC in 7 T corresponds to about 4 x 10~(-4) μ_B/atom (Bohr magneton) of the maximum deformed afm sample. The Neel temperature decreases due to deformation.
机译：在奥氏体Fe_（61.5）Mn_（23）Ni_7Cr_（8.5）中，反铁磁（afm）合金变形导致在Neel温度以下的场冷却（FC）期间测得的磁化-温度曲线与在相同温度下测得的磁化-温度曲线之间存在差异。零场冷却（ZFC）后的磁场。此外，出现了一个热剩磁化（TRM），它对应于给定冷却场的零场和场冷却热磁测量之间的划分，并随变形程度而变化。该TRM归因于由变形引起的缺陷，这些缺陷充当未补偿磁矩的来源，并与整体afm矩相互作用。净磁矩在Neel温度以上消失的事实也支持这种解释。 TRM不会在冷却期间施加的最高7T磁场中饱和，也无法通过最高7T的磁场进行切换。在研究的-7 T至7 T磁场范围内，磁化强度与磁场的关系曲线显示出沿磁化强度轴的稳定位移。因此，未补偿的力矩似乎与周围的afm矩阵强烈交换。在一系列实验中，在7 T下FC之后达到的最大TRM对应于最大变形afm样品的约4 x 10〜（-4）μ_B/原子（玻尔磁子）。尼尔温度由于变形而降低。

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