Multiple magnetic droplet soliton modes

Statuto, Nahuel; Hahn, Christian; Hernàndez, Joan Manel; Kent, Andrew D.; Macià, Ferran

doi:10.1103/physrevb.99.174436

Title: Multiple magnetic droplet soliton modes

Journal Article · Tue May 28 00:00:00 EDT 2019 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.99.174436· OSTI ID:1613162

Statuto, Nahuel ^[1]; Hahn, Christian ^[2]; Hernàndez, Joan Manel ^[3]; Kent, Andrew D. ^[4]; Macià, Ferran ^[1]

Inst. de Ciencia de Materials de Barcelona (ICMAB-CSIC), Bellaterra (Spain); Univ. of Barcelona (Spain)
New York Univ. (NYU), NY (United States); Physikalisch-Technische Bundesanstalt, Braunschweig (Germany)
Univ. of Barcelona (Spain)
New York Univ. (NYU), NY (United States)

Droplet solitons are large amplitude localized spin-wave excitations that can be created in magnetic thin films with uniaxial anisotropy by a spin-polarized current flowing through an electrical nanocontact. Here, we report a low-temperature (4 K) experimental study that shows there are multiple and, under certain conditions, combinations of droplet modes, each mode with a distinct high-frequency spin precession (tens of gigahertz). Low-frequency (≲1GHz) voltage noise is used to assess the stability of droplet modes. It is found that droplets are stable only in a limited range of applied field and current, typically near the current and field at which they nucleate, in agreement with recent predictions. Applied fields in the film plane favor multiple droplet modes, whereas fields perpendicular to the film plane tend to stabilize a single droplet mode. Furthermore, micromagnetic simulations are used to show that spatial variation in the energy landscape in the nanocontact region (e.g., spatial variation of magnetic anisotropy or magnetic field) can lead to quantized droplet modes and low-frequency mode modulation, characteristics observed in our experiments.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Quantum Materials for Energy Efficient Neuromorphic Computing (Q-MEEN-C); Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019273

OSTI ID:: 1613162

Alternate ID(s):: OSTI ID: 1518504

Journal Information:: Physical Review. B, Vol. 99, Issue 17; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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Thermal Activation Barriers for Creation and Annihilation of Magnetic Droplet Solitons in the Presence of Spin Transfer Torque Chaves-O'Flynn, Gabriel D.; Stein, Daniel L. arXiv https://doi.org/10.48550/arxiv.2005.03416	text	January 2020

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