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Quasistatic remanence in Dzyaloshinskii-Moriya interaction driven weak ferromagnets and piezomagnets
Physical Review B ( IF 3.7 ) Pub Date : 2017-09-18 00:00:00 , DOI: 10.1103/physrevb.96.104422
Namrata Pattanayak , Arpan Bhattacharyya , A. K. Nigam , Sang-Wook Cheong , Ashna Bajpai

We explore remanent magnetization (μ) as a function of time and temperature, in a variety of rhombohedral antiferromagnets (AFMs) which are also weak ferromagnets (WFMs) and piezomagnets (PzMs). These measurements, across samples with length scales ranging from nano to bulk, firmly establish the presence of a remanence that is quasistatic in nature and exhibits a counterintuitive magnetic field dependence. These observations unravel an ultraslow magnetization relaxation phenomenon related to this quasistatic remanence. This feature is also observed in a defect-free single crystal of αFe2O3, which is a canonical WFM and PzM. Notably, αFe2O3 is not a typical geometrically frustrated AFM, and in single crystal form it is also devoid of any size or interface effects, which are the usual suspects for a slow magnetization relaxation phenomenon. The underlying pinning mechanism appears exclusive to those AFMs which either are symmetry allowed WFMs, driven by Dzyaloshinskii-Moriya interaction, or can generate this trait by tuning of size and interface. The qualitative features of the quasistatic remanence indicate that such WFMs are potential piezomagnets, in which magnetization can be tuned by stress alone.

中文翻译:

Dzyaloshinskii-Moriya相互作用中的准静态剩磁驱动弱铁磁体和压电磁体

我们探索剩磁 μ作为时间和温度的函数,在各种菱形反铁磁体(AFM)中,它们也是弱铁磁体(WFM)和压电磁体(PzM)。这些测量在长度范围从纳米到大块不等的样品上,牢固地确定了残留物的性质,该残留物本质上是准静态的,并表现出与直觉磁场相关的特性。这些观察结果揭示了与这种准静态剩磁有关的超慢磁化弛豫现象。在无缺陷的单晶硅中也观察到了此功能。α-2个Ø3,这是规范的WFM和PzM。尤其,α-2个Ø3它不是典型的几何受挫的原子力显微镜,而且在单晶形式下也没有任何尺寸或界面效应,这通常是缓慢磁化弛豫现象的怀疑。潜在的固定机制对于那些由Dzyaloshinskii-Moriya交互作用驱动的,允许对称WFM的AFM似乎是唯一的,或者可以通过调整大小和界面来生成此特征。准剩磁的定性特征表明,这种WFM是潜在的压电磁铁,其中的磁化强度可以仅通过应力来调节。
更新日期:2017-09-19
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