Magnetic droplet soliton pairs

Jiang, S.; Chung, S.; Ahlberg, M.; Frisk, A.; Khymyn, R.; Le, Q. Tuan; Mazraati, H.; Houshang, A.; Heinonen, O.; Åkerman, J.

doi:10.1038/s41467-024-46404-7

Title: Magnetic droplet soliton pairs

Journal Article · 08 March 2024 · Nature Communications

DOI: https://doi.org/10.1038/s41467-024-46404-7 · OSTI ID:2470015

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^[3]; Le, Q. Tuan ^[4]; Mazraati, H. ^[5]; Houshang, A. ^[3]; Heinonen, O. ^[6];

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South China Univ. of Technology (SCUT), Guangzhou (China); Univ. of Gothenburg (Sweden)
Univ. of Gothenburg (Sweden); Korea National University of Education (Korea, Republic of)
Univ. of Gothenburg (Sweden)
Univ. of Gothenburg (Sweden); KTH Royal Inst. of Technology, Stockholm (Sweden)
KTH Royal Inst. of Technology, Stockholm (Sweden)
Argonne National Laboratory (ANL), Argonne, IL (United States)
Univ. of Gothenburg (Sweden); KTH Royal Inst. of Technology, Stockholm (Sweden); Tohoku Univ., Sendai (Japan)

We demonstrate magnetic droplet soliton pairs in all-perpendicular spin-torque nano-oscillators (STNOs), where one droplet resides in the STNO free layer (FL) and the other in the reference layer (RL). Typically, theoretical, numerical, and experimental droplet studies have focused on the FL, with any additional dynamics in the RL entirely ignored. Here we show that there is not only significant magnetodynamics in the RL, but the RL itself can host a droplet driven by, and coexisting with, the FL droplet. Both single droplets and pairs are observed experimentally as stepwise changes and sharp peaks in the dc and differential resistance, respectively. While the single FL droplet is highly stable, the coexistence state exhibits high-power broadband microwave noise. Furthermore, micromagnetic simulations reveal that the pair dynamics display periodic, quasi-periodic, and chaotic signatures controlled by applied field and current. The strongly interacting and closely spaced droplet pair offers a unique platform for fundamental studies of highly non-linear soliton pair dynamics.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2470015

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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