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Proceedings Paper

Antiferromagnetism emerging in a ferromagnet with gain (Conference Presentation)
Author(s): Peng Yan

Paper 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.

Paper Details

Date Published: 10 September 2019
Proc. SPIE 11090, Spintronics XII, 1109005 (10 September 2019); doi: 10.1117/12.2528255
Show Author Affiliations
Peng Yan, Univ. of Electronic Science and Technology of China (China)

Published in SPIE Proceedings Vol. 11090:
Spintronics XII
Henri-Jean M. Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

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