arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1302.2845cond-mat.mtrl-scicond-mat.mes-hallcond-mat.str-el
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双层锰氧化物中的反铁磁畴结构

Antiferromagnetic Domain Structure in Bilayer Manganite

M. García-Fernández, S. B. Wilkins, Ming Lu, Qing'an Li, K. E. Gray, H. Zheng, J. F. Mitchell, Daniel Khomskii

摘要:

本文报道了一种新的软X射线纳米衍射研究强关联层状锰氧化物La $_{0.96}$ Sr $_{2.04}$ Mn $_{2}$ O $_{7}$中的反铁磁畴。我们发现,反铁磁畴淬火,形成一个独特的域模式,每个域具有其自旋方向的固有记忆,并与相关的畴壁沿结晶方向运行。这可以通过在晶体生长过程中锁定的晶体或磁性缺陷的存在来解释,这些缺陷钉扎反铁磁畴。反铁磁畴图案显示两种不同类型的域。我们观察到,在一种类型中,在锰自旋方向上的周期性波纹,周期约为4 \micro \meter。我们建议,双层内的反转对称性的损失是负责通过Dzyaloshinskiii-Moriya型相互作用的这种波纹结构。

英文摘要:

We report a novel soft x-ray nanodiffraction study of antiferromagnetic domains in the strongly correlated bylayer manganite La$_{0.96}$Sr$_{2.04}$Mn$_{2}$O$_{7}$. We find that the antiferromagnetic domains are quenched, forming a unique domain pattern with each domain having an intrinsic memory of its spin direction, and with associated domain walls running along crystallographic directions. This can be explained by the presence of crystallographic or magnetic imperfections locked in during the crystal growth process which pin the antiferromagnetic domains. The antiferromagnetic domain pattern shows two distinct types of domain. We observe, in one type only, a periodic ripple in the manganese spin direction with a period of approximately 4 \micro\meter. We propose that the loss of inversion symmetry within a bilayer is responsible for this ripple structure through a Dzyaloshinskii-Moriya-type interaction.

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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