Nonreciprocal coherent coupling of nanomagnets by exchange spin waves

Hanchen Wang, Jilei Chen, Tao Yu, Chuanpu Liu, Chenyang Guo, Song Liu, Ka Shen, Hao Jia, Gerrit E.W. Bauer

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Nanomagnets are widely used to store information in non-volatile spintronic devices. Spin waves can transfer information with low-power consumption as their propagations are independent of charge transport. However, to dynamically couple two distant nanomagnets via spin waves remains a major challenge for magnonics. Here we experimentally demonstrate coherent coupling of two distant Co nanowires by fast propagating spin waves in an yttrium iron garnet thin film with sub-50 nm wavelengths. Magnons in two nanomagnets are unidirectionally phase-locked with phase shifts controlled by magnon spin torque and spin-wave propagation. The coupled system is finally formulated by an analytical theory in terms of an effective non-Hermitian Hamiltonian. Our results are attractive for analog neuromorphic computing that requires unidirectional information transmission. [Figure not available: see fulltext.]

Original languageEnglish
Number of pages6
JournalNano Research
DOIs
Publication statusPublished - 2020

Keywords

  • coherent coupling
  • nanomagnets
  • nonreciprocity
  • spin waves
  • spintronics

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