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10 September 2019 Antiferromagnetism emerging in a ferromagnet with gain (Conference Presentation)
Peng Yan
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Proceedings Volume 11090, Spintronics XII; 1109005 (2019) https://doi.org/10.1117/12.2528255
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States
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. We predict a spectral region in the first Brillouin zone, in which the parity-time symmetry is never broken in the framework of linear spin wave theory. Our results pave the way for investigating the emerging antiferromagnetic spintronics and parity-time symmetric magnonics in ferromagnets.
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Peng Yan "Antiferromagnetism emerging in a ferromagnet with gain (Conference Presentation)", Proc. SPIE 11090, Spintronics XII, 1109005 (10 September 2019); https://doi.org/10.1117/12.2528255
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KEYWORDS
Ferromagnetics
Quasiparticles
Spintronics
Thin films
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