Twisted Magnon as a Magnetic Tweezer

Yuanyuan Jiang; H. Y. Yuan; Z. X. Li; Zhenyu Wang; H. W. Zhang; Yunshan Cao; Peng Yan

doi:10.1103/PhysRevLett.124.217204

Twisted Magnon as a Magnetic Tweezer

Yuanyuan Jiang^*, H. Y. Yuan, Z. X. Li, Zhenyu Wang, H. W. Zhang, Yunshan Cao, Peng Yan

^*Corresponding author for this work

University of Electronic Science and Technology of China

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

Wave fields with spiral phase dislocations carrying orbital angular momentum (OAM) have been realized in many branches of physics, such as for photons, sound waves, electron beams, and neutrons. However, the OAM states of magnons (spin waves)-the building block of modern magnetism-and particularly their implications have yet to be addressed. Here, we theoretically investigate the twisted spin-wave generation and propagation in magnetic nanocylinders. The OAM nature of magnons is uncovered by showing that the spin-wave eigenmode is also the eigenstate of the OAM operator in the confined geometry. Inspired by optical tweezers, we predict an exotic "magnetic tweezer" effect by showing skyrmion gyrations under twisted magnons in the exchange-coupled nanocylinder-nanodisk heterostructure, as a practical demonstration of magnonic OAM transfer to manipulate topological spin defects. Our study paves the way for the emerging magnetic manipulations by harnessing the OAM degree of freedom of magnons.

Original language	English
Article number	217204
Pages (from-to)	1-7
Journal	Physical Review Letters
Volume	124
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevLett.124.217204
Publication status	Published - 29 May 2020

Bibliographical note

Funding Information:
This work was funded by the National Natural Science Foundation of China (Grants No. 11604041, No. 11704060, and No. 11904048) and the National Key Research Development Program under Contract No. 2016YFA0300801. H. Y. Y. acknowledges financial support from the National Natural Science Foundation of China under Grant No. 61704071 and the Shenzhen Fundamental Subject Research Program under Grant No. JCYJ20180302174248595

Publisher Copyright:
© 2020 American Physical Society.

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

Funding

This work was funded by the National Natural Science Foundation of China (Grants No. 11604041, No. 11704060, and No. 11904048) and the National Key Research Development Program under Contract No. 2016YFA0300801. H. Y. Y. acknowledges financial support from the National Natural Science Foundation of China under Grant No. 61704071 and the Shenzhen Fundamental Subject Research Program under Grant No. JCYJ20180302174248595

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Cite this

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title = "Twisted Magnon as a Magnetic Tweezer",

abstract = "Wave fields with spiral phase dislocations carrying orbital angular momentum (OAM) have been realized in many branches of physics, such as for photons, sound waves, electron beams, and neutrons. However, the OAM states of magnons (spin waves)-the building block of modern magnetism-and particularly their implications have yet to be addressed. Here, we theoretically investigate the twisted spin-wave generation and propagation in magnetic nanocylinders. The OAM nature of magnons is uncovered by showing that the spin-wave eigenmode is also the eigenstate of the OAM operator in the confined geometry. Inspired by optical tweezers, we predict an exotic {"}magnetic tweezer{"} effect by showing skyrmion gyrations under twisted magnons in the exchange-coupled nanocylinder-nanodisk heterostructure, as a practical demonstration of magnonic OAM transfer to manipulate topological spin defects. Our study paves the way for the emerging magnetic manipulations by harnessing the OAM degree of freedom of magnons.",

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note = "Funding Information: This work was funded by the National Natural Science Foundation of China (Grants No. 11604041, No. 11704060, and No. 11904048) and the National Key Research Development Program under Contract No. 2016YFA0300801. H. Y. Y. acknowledges financial support from the National Natural Science Foundation of China under Grant No. 61704071 and the Shenzhen Fundamental Subject Research Program under Grant No. JCYJ20180302174248595 Publisher Copyright: {\textcopyright} 2020 American Physical Society. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",

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N1 - Funding Information: This work was funded by the National Natural Science Foundation of China (Grants No. 11604041, No. 11704060, and No. 11904048) and the National Key Research Development Program under Contract No. 2016YFA0300801. H. Y. Y. acknowledges financial support from the National Natural Science Foundation of China under Grant No. 61704071 and the Shenzhen Fundamental Subject Research Program under Grant No. JCYJ20180302174248595 Publisher Copyright: © 2020 American Physical Society. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

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N2 - Wave fields with spiral phase dislocations carrying orbital angular momentum (OAM) have been realized in many branches of physics, such as for photons, sound waves, electron beams, and neutrons. However, the OAM states of magnons (spin waves)-the building block of modern magnetism-and particularly their implications have yet to be addressed. Here, we theoretically investigate the twisted spin-wave generation and propagation in magnetic nanocylinders. The OAM nature of magnons is uncovered by showing that the spin-wave eigenmode is also the eigenstate of the OAM operator in the confined geometry. Inspired by optical tweezers, we predict an exotic "magnetic tweezer" effect by showing skyrmion gyrations under twisted magnons in the exchange-coupled nanocylinder-nanodisk heterostructure, as a practical demonstration of magnonic OAM transfer to manipulate topological spin defects. Our study paves the way for the emerging magnetic manipulations by harnessing the OAM degree of freedom of magnons.

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Twisted Magnon as a Magnetic Tweezer

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