arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1502.00810cond-mat.str-el
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单手Helimagnet MnSi在零场极限下的磁单畴态:磁性研究

Magnetic Single Domain State of the Monochiral Helimagnet MnSi in Zero Field Limit: Magnetic Properties Study

V. N. Narozhnyi, V. N. Krasnorussky

摘要:

注意的可能性,以获得在零磁场限制的磁性单畴状态(SDS)的单手性helimagnet锰硅。结果表明,这种亚稳零场磁性SDS可以实现由磁场逐渐下降到零后,MnSi的初始转换到自旋极化状态在高场$H$。这仅适用于$\bf{H}\parallel$ [111]。通过对磁性SDS中MnSi的研究,我们有可能确定该化合物低场磁化率的两个组分$χ_{\perp}(T)$和$χ_{\parallel}(T)$ [ $χ_{\perp}$和$χ_{\parallel}$对应于$\bf{H}\perp$,而$\bf{H}\parallel$(111)-平面含有螺旋有序态的磁矩]。这些结果进行了比较,宏观磁化率MnSi早先确定该化合物仅在磁性多畴状态(MDS)。此外,我们的结果与一些非单手性helimagnets报道的数据进行了比较。阐述了单手性螺旋磁体的特性。

英文摘要:

Attention is drawn to a possibility to obtain the monochiral helimagnet MnSi in a magnetic single domain state (SDS) in zero magnetic field limit. It is shown that this metastable zero field magnetic SDS can be achieved by gradual decrease of the field down to zero after initial transformation of MnSi to a spin-polarized state in high fields $H$. This can be achieved only for $\bf{H}\parallel$ [111]. Investigations of MnSi in magnetic SDS give us a possibility to determine the two components of low field magnetic susceptibility of this compound, $χ_{\perp}(T)$ and $χ_{\parallel}(T)$ [$χ_{\perp}$ and $χ_{\parallel}$ correspond to $\bf{H}\perp$, and $\bf{H}\parallel$ (111)-plane containing magnetic moments in helically ordered state]. These results are compared with macroscopic magnetic susceptibility of MnSi earlier determined for this compound only in magnetic multi domain state (MDS). In addition our results are compared with the data reported for some non-monochiral helimagnets. Characteristic features of monochiral helimagnets are elucidated.

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