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arXiv · 1804.08780

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·Daniel Haskel·Philip J. Ryan·Haixuan Xu·Cristian D. Batista·M. P. M. Dean·Jian Liu
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Abstract

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.

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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. 2018-04-23. Giant magnetic response of a two-dimensional antiferromagnet. https://doi.org/10.1038/s41567-018-0152-6

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