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Mutual Synchronization of Constriction-Based Spin Hall Nano-Oscillators in Weak In-Plane Magnetic Fields
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.ORCID iD: 0000-0003-3605-8872
Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden..
Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden..
Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden..
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2022 (English)In: Physical Review Applied, E-ISSN 2331-7019, Vol. 18, no 1, article id 014026Article in journal (Refereed) Published
Abstract [en]

We study mutual synchronization in double nanoconstriction-based spin Hall nano-oscillators (SHNOs) under weak in-plane magnetic fields (mu H-0(IP) = 30-40 mT) and also investigate its angular dependence. We compare SHNOs with different nanoconstriction spacings of 300 and 900 nm. In all devices, mutual synchronization occurs below a certain critical angle, which is higher for the 300 nm spacing than for the 900 nm spacing, reflecting the stronger coupling at shorter distances. Alongside the synchronization, we observe a strong second harmonic consistent with predictions that the synchronization may be mediated by the propagation of second-harmonic spin waves. However, although Brillouin light scattering microscopy confirms the synchronization, it fails to detect any related increase of the second harmonic. Micromagnetic simulations instead explain the angular-dependent synchronization as predominantly due to magnetodipolar coupling between neighboring SHNOs.

Place, publisher, year, edition, pages
American Physical Society, 2022. Vol. 18, no 1, article id 014026
National Category
Fusion, Plasma and Space Physics
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URN: urn:nbn:se:kth:diva-316030DOI: 10.1103/PhysRevApplied.18.014026ISI: 000829950100003Scopus ID: 2-s2.0-85134674078OAI: oai:DiVA.org:kth-316030DiVA, id: diva2:1686316
Note

QC 20220809

Available from: 2022-08-09 Created: 2022-08-09 Last updated: 2022-08-09Bibliographically approved

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Mazraati, HamidBanuazizi, Seyed Amir HosseinÅkerman, Johan

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