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

Zhang, Chi; Pu, Yong; Manuilov, Sergei A.; White, Shane P.; Page, Michael R.; Blomberg, Erick C.; Pelekhov, Denis V.; Hammel, P. Chris

doi:10.1103/physrevapplied.7.054019

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

Journal Article · Thu May 25 00:00:00 EDT 2017 · Physical Review Applied

DOI:https://doi.org/10.1103/physrevapplied.7.054019· OSTI ID:1535763

Zhang, Chi ^[1]; Pu, Yong ^[2]; Manuilov, Sergei A. ^[2]; White, Shane P. ^[2]; Page, Michael R. ^[2]; Blomberg, Erick C. ^[2]; Pelekhov, Denis V. ^[2]; Hammel, P. Chris ^[2]

The Ohio State Univ., Columbus, OH (United States); DOE/OSTI
The Ohio State Univ., Columbus, OH (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: The Ohio State Univ., Columbus, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: FG02-03ER46054

OSTI ID:: 1535763

Alternate ID(s):: OSTI ID: 1358642

Journal Information:: Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 5 Vol. 7; ISSN 2331-7019

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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