Antiferromagnetism Emerging in a Ferromagnet with Gain

作者：Yang, Huanhuan; Wang, C.; Yu, Tianlin; Cao, Yunshan^*; Yan, Peng

来源：Physical Review Letters, 2018, 121(19): 197201.

DOI：10.1103/PhysRevLett.121.197201

• PARITY-TIME SYMMETRY
• WEAK FERROMAGNETISM
• FERH ALLOYS
• FIELD
• MAGNETIZATION
• TRANSITIONS
• MOTION
• STATES
• MODEL

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.

• 出版日期2018-11-5
• 单位电子科技大学