Oscillations and confluence in three-magnon scattering of ferromagnetic resonance

Tao Qu; Alex Hamill; R. H. Victora; P. A. Crowell

doi:10.1103/PhysRevB.107.L060401

Oscillations and confluence in three-magnon scattering of ferromagnetic resonance

Tao Qu
, Alex Hamill
, R. H. Victora
, P. A. Crowell

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

7 Scopus citations

Abstract

We have performed a time-resolved and phase-sensitive investigation of three-magnon scattering of ferromagnetic resonance (FMR) over several orders of magnitude in excitation power. We observe a regime that hosts transient oscillations of the FMR magnon population, despite higher-order magnon interactions at large powers. Also at high powers, the scattering generates 180∘ phase shifts of the FMR magnons. These phase shifts correspond to reversals in the three-magnon scattering direction, between splitting and confluence. These scattering reversals are most directly observed after removing the microwave excitation, generating coherent oscillations of the FMR magnon population much larger than its steady-state value during the excitation. Our model is in strong agreement with these findings. These findings reveal the transient behavior of this three-magnon scattering process, and the nontrivial interplay between three-magnon scattering and the magnons' phases.

Original language	English (US)
Article number	L060401
Journal	Physical Review B
Volume	107
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.107.L060401
State	Published - Feb 1 2023

Bibliographical note

Funding Information:
The authors thank A. Venugopal for fruitful discussion on efficient computation in the micromagnetic simulations and C. D. Schimming for valuable mathematical insight. The Minnesota Supercomputing Institute (MSI) provided resources that contributed to the research results reported within this article. The authors acknowledge support by SMART, a center funded by nCORE, a SRC program sponsored by NIST. The authors also acknowledge support by DARPA under Grant No. W911NF-17-1-0100, the Center for Micromagnetics and Information Technology (MINT) at the University of Minnesota, and the NSF through the Extreme Science and Engineering Discovery Environment (XSEDE) under Grant No. ACI-1548562. T.Q. and A.H. contributed equally to this work.

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© 2023 American Physical Society.

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title = "Oscillations and confluence in three-magnon scattering of ferromagnetic resonance",

abstract = "We have performed a time-resolved and phase-sensitive investigation of three-magnon scattering of ferromagnetic resonance (FMR) over several orders of magnitude in excitation power. We observe a regime that hosts transient oscillations of the FMR magnon population, despite higher-order magnon interactions at large powers. Also at high powers, the scattering generates 180∘ phase shifts of the FMR magnons. These phase shifts correspond to reversals in the three-magnon scattering direction, between splitting and confluence. These scattering reversals are most directly observed after removing the microwave excitation, generating coherent oscillations of the FMR magnon population much larger than its steady-state value during the excitation. Our model is in strong agreement with these findings. These findings reveal the transient behavior of this three-magnon scattering process, and the nontrivial interplay between three-magnon scattering and the magnons' phases.",

author = "Tao Qu and Alex Hamill and Victora, \{R. H.\} and Crowell, \{P. A.\}",

note = "Funding Information: The authors thank A. Venugopal for fruitful discussion on efficient computation in the micromagnetic simulations and C. D. Schimming for valuable mathematical insight. The Minnesota Supercomputing Institute (MSI) provided resources that contributed to the research results reported within this article. The authors acknowledge support by SMART, a center funded by nCORE, a SRC program sponsored by NIST. The authors also acknowledge support by DARPA under Grant No. W911NF-17-1-0100, the Center for Micromagnetics and Information Technology (MINT) at the University of Minnesota, and the NSF through the Extreme Science and Engineering Discovery Environment (XSEDE) under Grant No. ACI-1548562. T.Q. and A.H. contributed equally to this work. Publisher Copyright: {\textcopyright} 2023 American Physical Society.",

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AU - Qu, Tao

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AU - Victora, R. H.

AU - Crowell, P. A.

N1 - Funding Information: The authors thank A. Venugopal for fruitful discussion on efficient computation in the micromagnetic simulations and C. D. Schimming for valuable mathematical insight. The Minnesota Supercomputing Institute (MSI) provided resources that contributed to the research results reported within this article. The authors acknowledge support by SMART, a center funded by nCORE, a SRC program sponsored by NIST. The authors also acknowledge support by DARPA under Grant No. W911NF-17-1-0100, the Center for Micromagnetics and Information Technology (MINT) at the University of Minnesota, and the NSF through the Extreme Science and Engineering Discovery Environment (XSEDE) under Grant No. ACI-1548562. T.Q. and A.H. contributed equally to this work. Publisher Copyright: © 2023 American Physical Society.

PY - 2023/2/1

Y1 - 2023/2/1

N2 - We have performed a time-resolved and phase-sensitive investigation of three-magnon scattering of ferromagnetic resonance (FMR) over several orders of magnitude in excitation power. We observe a regime that hosts transient oscillations of the FMR magnon population, despite higher-order magnon interactions at large powers. Also at high powers, the scattering generates 180∘ phase shifts of the FMR magnons. These phase shifts correspond to reversals in the three-magnon scattering direction, between splitting and confluence. These scattering reversals are most directly observed after removing the microwave excitation, generating coherent oscillations of the FMR magnon population much larger than its steady-state value during the excitation. Our model is in strong agreement with these findings. These findings reveal the transient behavior of this three-magnon scattering process, and the nontrivial interplay between three-magnon scattering and the magnons' phases.

AB - We have performed a time-resolved and phase-sensitive investigation of three-magnon scattering of ferromagnetic resonance (FMR) over several orders of magnitude in excitation power. We observe a regime that hosts transient oscillations of the FMR magnon population, despite higher-order magnon interactions at large powers. Also at high powers, the scattering generates 180∘ phase shifts of the FMR magnons. These phase shifts correspond to reversals in the three-magnon scattering direction, between splitting and confluence. These scattering reversals are most directly observed after removing the microwave excitation, generating coherent oscillations of the FMR magnon population much larger than its steady-state value during the excitation. Our model is in strong agreement with these findings. These findings reveal the transient behavior of this three-magnon scattering process, and the nontrivial interplay between three-magnon scattering and the magnons' phases.

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Oscillations and confluence in three-magnon scattering of ferromagnetic resonance

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