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arXiv 1804.08780cond-mat.str-el
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二维反铁磁体的巨磁响应

Giant magnetic response of a two-dimensional antiferromagnet

Lin Hao, D. Meyers, Hidemaro Suwa, Junyi Yang, Clayton Frederick, Tamene R. Dasa, Gilberto Fabbris, Lukas Horak, Dominik Kriegner, Yongseong Choi, Jong-Woo Kim,… 展开作者

Lin Hao, D. Meyers, Hidemaro Suwa, Junyi Yang, Clayton Frederick, Tamene R. Dasa, Gilberto Fabbris, Lukas Horak, Dominik Kriegner, Yongseong Choi, Jong-Woo Kim, Daniel Haskel, Philip J. Ryan, Haixuan Xu, Cristian D. Batista, M. P. M. Dean, Jian Liu

摘要:

反铁磁体和铁磁体之间的根本区别在于由于交错的序参量而缺乏与均匀磁场的线性耦合。这种耦合是可能的,通过Dzyaloshinskiii-Moriya(DM)的相互作用,但由于倾斜诱导的自旋各向异性的反铁磁(AFM)的磁化率降低为代价。我们解决了这个长期存在的问题与自上而下的方法,利用自旋轨道耦合在一个隐藏的SU(2)对称性的存在。我们展示了巨大的原子力显微镜响应子特斯拉外场利用下的一个恒定的交换各向异性,这是内置到一个正方形晶格人工合成的SrIrO 3和SrTiO 3的超晶格下保存的非常强大的二维临界波动。所观察到的场诱导的对数增加的有序温度,使高效控制的AFM顺序。由于反铁磁体承诺提供远远超过铁磁体的开关速度和存储安全性,我们的不变性方法释放了功能反铁磁体的巨大潜力。

英文摘要:

A fundamental difference between antiferromagnets and ferromagnets is the lack of linear coupling to a uniform magnetic field due to the staggered order parameter. Such coupling is possible via the Dzyaloshinskii-Moriya (DM) interaction but at the expense of reduced antiferromagnetic (AFM) susceptibility due to the canting-induced spin anisotropy. We solve this long-standing problem with a top-down approach that utilizes spin-orbit coupling in the presence of a hidden SU(2) symmetry. We demonstrate giant AFM responses to sub-Tesla external fields by exploiting the extremely strong two-dimensional critical fluctuations preserved under a symmetry-invariant exchange anisotropy, which is built into a square-lattice artificially synthesized as a superlattice of SrIrO3 and SrTiO3. The observed field-induced logarithmic increase of the ordering temperature enables highly efficient control of the AFM order. As antiferromagnets promise to afford switching speed and storage security far beyond ferromagnets, our symmetry-invariant approach unleashes the great potential of functional antiferromagnets.

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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