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Title: Engineering the Spectrum of Dipole Field-Localized Spin-Wave Modes to Enable Spin-Torque Antidamping

Abstract

Auto-oscillation of a ferromagnet due to spin-orbit torques in response to a dc current is of wide interest as a flexible mechanism for generating controllable high-frequency magnetic dynamics. However, degeneracies of the spin-wave modes and nonlinear magnon-magnon scattering impede coherent precession. Discretization of the spin-wave modes can reduce this scattering. Furthermore, spatial localization of the spin-wave modes by the strongly inhomogeneous dipole magnetic field of a nearby spherical micromagnet provides variable spatial confinement, thus offering the option of systematic tunability of magnon spectrum for studying multimode interactions. Here we demonstrate that field localization generates a discrete spin-wave spectrum observable as a series of well-resolved localized modes in the presence of imposed spin currents arising from the spin Hall effect in a permalloy-platinum (Py/Pt) microstrip. The observation of linewidth reduction through damping control in this micromagnetically engineered spectrum demonstrates that localized modes can be controlled efficiently, an important step toward continuously tunable spin Hall effect–driven auto-oscillators.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. The Ohio State Univ., Columbus, OH (United States)
Publication Date:
Research Org.:
The Ohio State Univ., Columbus, OH (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1535763
Alternate Identifier(s):
OSTI ID: 1358642
Grant/Contract Number:  
FG02-03ER46054; DMR-1420451
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Applied
Additional Journal Information:
Journal Volume: 7; Journal Issue: 5; Journal ID: ISSN 2331-7019
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; bilayers; spin waves; spintronics; permalloy; ferromagnetic resonance; magnetic force microscopy

Citation Formats

Zhang, Chi, Pu, Yong, Manuilov, Sergei A., White, Shane P., Page, Michael R., Blomberg, Erick C., Pelekhov, Denis V., and Hammel, P. Chris. Engineering the Spectrum of Dipole Field-Localized Spin-Wave Modes to Enable Spin-Torque Antidamping. United States: N. p., 2017. Web. doi:10.1103/physrevapplied.7.054019.
Zhang, Chi, Pu, Yong, Manuilov, Sergei A., White, Shane P., Page, Michael R., Blomberg, Erick C., Pelekhov, Denis V., & Hammel, P. Chris. Engineering the Spectrum of Dipole Field-Localized Spin-Wave Modes to Enable Spin-Torque Antidamping. United States. https://doi.org/10.1103/physrevapplied.7.054019
Zhang, Chi, Pu, Yong, Manuilov, Sergei A., White, Shane P., Page, Michael R., Blomberg, Erick C., Pelekhov, Denis V., and Hammel, P. Chris. 2017. "Engineering the Spectrum of Dipole Field-Localized Spin-Wave Modes to Enable Spin-Torque Antidamping". United States. https://doi.org/10.1103/physrevapplied.7.054019. https://www.osti.gov/servlets/purl/1535763.
@article{osti_1535763,
title = {Engineering the Spectrum of Dipole Field-Localized Spin-Wave Modes to Enable Spin-Torque Antidamping},
author = {Zhang, Chi and Pu, Yong and Manuilov, Sergei A. and White, Shane P. and Page, Michael R. and Blomberg, Erick C. and Pelekhov, Denis V. and Hammel, P. Chris},
abstractNote = {Auto-oscillation of a ferromagnet due to spin-orbit torques in response to a dc current is of wide interest as a flexible mechanism for generating controllable high-frequency magnetic dynamics. However, degeneracies of the spin-wave modes and nonlinear magnon-magnon scattering impede coherent precession. Discretization of the spin-wave modes can reduce this scattering. Furthermore, spatial localization of the spin-wave modes by the strongly inhomogeneous dipole magnetic field of a nearby spherical micromagnet provides variable spatial confinement, thus offering the option of systematic tunability of magnon spectrum for studying multimode interactions. Here we demonstrate that field localization generates a discrete spin-wave spectrum observable as a series of well-resolved localized modes in the presence of imposed spin currents arising from the spin Hall effect in a permalloy-platinum (Py/Pt) microstrip. The observation of linewidth reduction through damping control in this micromagnetically engineered spectrum demonstrates that localized modes can be controlled efficiently, an important step toward continuously tunable spin Hall effect–driven auto-oscillators.},
doi = {10.1103/physrevapplied.7.054019},
url = {https://www.osti.gov/biblio/1535763}, journal = {Physical Review Applied},
issn = {2331-7019},
number = 5,
volume = 7,
place = {United States},
year = {2017},
month = {5}
}

Works referenced in this record:

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Works referencing / citing this record:

Giant nonlinear damping in nanoscale ferromagnets
journal, October 2019