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Auto-oscillating Spin-Wave Modes of Constriction-Based Spin Hall Nano-oscillators in Weak In-Plane Fields
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics. NanOsc AB, SE-16440 Kista, Sweden.ORCID iD: 0000-0003-3605-8872
Univ Gothenburg, Dept Phys, SE-41296 Gothenburg, Sweden..
KTH, School of Engineering Sciences (SCI), Applied Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics.
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2018 (English)In: Physical Review Applied, E-ISSN 2331-7019, Vol. 10, no 5, article id 054017Article in journal (Refereed) Published
Abstract [en]

We experimentally study the auto-oscillating spin-wave modes in Ni(80)Fc(20)/beta-W constriction-based spin Hall nano-oscillators as a function of bias current, strength of the in-plane applied field, and azimuthal field angle in the low-field range of 40-80 mT. We observe two different spin-wave modes: (i) a linearlike mode confined to the internal field minima near the edges of the nanoconstriction, and only weakly dependent on the bias current and the applied-field angle, and (ii) a second, lower-frequency mode with significantly higher threshold current and stronger dependence on both the bias current and the externalfield angle. Micromagnetic modeling qualitatively reproduces the experimental data and reveals that the second mode is a spin-wave bullet and that the spin Hall nano-oscillator mode hops between the two modes, resulting in a substantial increase in linewidths. In contrast to the linearlike mode, the bullet is localized in the middle of the constriction and shrinks with increasing bias current. Using intrinsic frequency doubling at zero field angle, we can reach frequencies above 9 GHz in fields as low as 40 mT, which is important for the development of low-field spintronic oscillators with applications in microwave-signal generation and neuromorphic computing.

Place, publisher, year, edition, pages
American Physical Society, 2018. Vol. 10, no 5, article id 054017
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-239478DOI: 10.1103/PhysRevApplied.10.054017ISI: 000449412100003Scopus ID: 2-s2.0-85056389030OAI: oai:DiVA.org:kth-239478DiVA, id: diva2:1265647
Funder
EU, Horizon 2020, 687676
Note

QC 20181126

Available from: 2018-11-26 Created: 2018-11-26 Last updated: 2018-11-26Bibliographically approved

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Mazraati, HamidChung, SunjaeÅkerman, Johan

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