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:
-
- 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:
- 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. Thu .
"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},
journal = {Physical Review Applied},
number = 5,
volume = 7,
place = {United States},
year = {Thu May 25 00:00:00 EDT 2017},
month = {Thu May 25 00:00:00 EDT 2017}
}
Web of Science
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Works referencing / citing this record:
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