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Excitation of unidirectional exchange spin waves by a nanoscale magnetic grating

Jilei Chen, Tao Yu, Chuanpu Liu, Tao Liu, Marco Madami, Ka Shen, Jianyu Zhang, Sa Tu, Md Shah Alam, Ke Xia, Mingzhong Wu, Gianluca Gubbiotti, Yaroslav M. Blanter, Gerrit E. W. Bauer, and Haiming Yu
Phys. Rev. B 100, 104427 – Published 20 September 2019
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Abstract

Magnon spintronics is a prosperous field that promises beyond-CMOS technology based on elementary excitations of the magnetic order that act as information carriers for future computational architectures. Unidirectional propagation of spin waves is key to the realization of magnonic logic devices. However, previous efforts to enhance the magnetostatic surface spin wave nonreciprocity did not realize (let alone control) purely unidirectional propagation. Here we experimentally demonstrate excitation of unidirectional exchange spin waves by a nanoscale magnetic grating consisting of Co nanowires fabricated on an ultrathin yttrium iron garnet film. We explain and model the nearly perfect unidirectional excitation by the chirality of the magneto-dipolar interactions between the Kittel mode of the nanowires and the exchange spin waves of the film. Reversal of the magnetic configurations of film and nanowire array from parallel to antiparallel changes the direction of the excited spin waves. Our results raise the prospect of a chiral magnonic logic without the need to involve fragile surface states.

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  • Received 11 March 2019
  • Revised 18 June 2019

DOI:https://doi.org/10.1103/PhysRevB.100.104427

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jilei Chen1,*, Tao Yu2,*, Chuanpu Liu1,*, Tao Liu3,*, Marco Madami4,*, Ka Shen5,*, Jianyu Zhang1, Sa Tu1, Md Shah Alam1, Ke Xia6, Mingzhong Wu3, Gianluca Gubbiotti7, Yaroslav M. Blanter2, Gerrit E. W. Bauer2,8,9,†, and Haiming Yu1,‡

  • 1Fert Beijing Institute, BDBC, School of Microelectronics, Beihang University, Beijing 100191, China
  • 2Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands
  • 3Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
  • 4Dipartimento di Fisica e Geologia, Università di Perugia, Via A. Pascoli, I-06123 Perugia, Italy
  • 5Department of Physics, Beijing Normal University, Beijing 100875, China
  • 6Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
  • 7Istituto Officina dei Materiali del Consiglio Nazionale delle Ricerche (IOM-CNR), Sede di Perugia, c/o Dipartimento di Fisica e Geologia, Via A. Pascoli, I-06123 Perugia, Italy
  • 8Institute for Materials Research, WPI-AIMR and CSNR, Tohoku University, Sendai 980-8577, Japan
  • 9Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands

  • *These authors contributed equally to this work.
  • g.e.w.bauer@imr.tohoku.ac.jp
  • haiming.yu@buaa.edu.cn

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Issue

Vol. 100, Iss. 10 — 1 September 2019

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