Abstract
We present a theoretical mapping to show that a ferromagnet with gain (loss) is equivalent to an antiferromagnet with an equal amount of loss (gain). Our findings indicate a novel first-order ferromagnet-antiferromagnet phase transition by tuning the gain-loss parameter. As an appealing application, we demonstrate the realization as well as the manipulation of the antiferromagnetic Skyrmion, a stable topological quasiparticle not yet observed experimentally, in a chiral ferromagnetic thin film with gain. We also consider ferromagnetic bilayers with balanced gain and loss and show that the antiferromagnetic Skyrmion can be found only in cases with a broken parity-time symmetry phase. Our results pave the way for investigating the emerging antiferromagnetic spintronics and parity-time symmetric magnonics in ferromagnets.
Highlights
The first-order antiferromagnetic (AFM) to ferromagnetic (FM) phase transition has received a tremendous attention in the community of condensed matter physics [1,2,3,4,5]
We numerically demonstrate the formation of an AFM Skyrmion, a stable topological quasiparticle yet to be observed experimentally, in single-layer chiral ferromagnets with gain, and we study its dynamics driven by spin-polarized electric currents
It is interesting that the emerging antiferromagnetism and the AFM Skyrmion can be found only when the PT symmetry is broken
Summary
The first-order antiferromagnetic (AFM) to ferromagnetic (FM) phase transition (or the other way around) has received a tremendous attention in the community of condensed matter physics [1,2,3,4,5] It involves a transition from a configuration with an antiparallel orientation of the magnetic moments to a parallel configuration, or vice versa. We map the equation of motion of local magnetic moments to a dissipative one in antiferromagnets and argue for their equivalence Based on this finding, we numerically demonstrate the formation of an AFM Skyrmion, a stable topological quasiparticle yet to be observed experimentally, in single-layer chiral ferromagnets with gain, and we study its dynamics driven by spin-polarized electric currents.
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