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Condensed Matter > Mesoscale and Nanoscale Physics

Title: Tunable Magnonic Chern Bands and Chiral Spin Currents in Magnetic Multilayers

Abstract: Realization of novel topological phases in magnonic band structures represents a new opportunity for the development of spintronics and magnonics with low power consumption. In this work, we show that in antiparallelly aligned magnetic multilayers, the long-range, chiral dipolar interaction generates bulk bands with non-zero Chern integers and magnonic surface states carrying chiral spin currents. The surface states are strictly localized and can be easily toggled between non-trivial and trivial phases through an external magnetic field. The realization of chiral surface spin currents in this dipolarly coupled heterostructure represents a magnonic implementation of the coupled wire model that has been extensively explored in electronic systems. Our work presents an easy-to-implement system for realizing topological magnonic surface states and low-dissipation spin current transport in a tunable manner.
Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Applied Physics (physics.app-ph)
DOI: 10.1103/PhysRevLett.128.217201
Cite as: arXiv:2201.00312 [cond-mat.mes-hall]
  (or arXiv:2201.00312v2 [cond-mat.mes-hall] for this version)

Submission history

From: Zhongqiang Hu [view email]
[v1] Sun, 2 Jan 2022 07:05:20 GMT (2620kb)
[v2] Sat, 8 Jan 2022 18:47:27 GMT (2613kb)

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