A 20 nm spin Hall nano-oscillator
2017 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 9, no 3, 1285-1291 p.Article in journal (Refereed) Published
Spin Hall nano-oscillators (SHNOs) are an emerging class of pure spin current driven microwave signal generators. Through the fabrication of 20 nm nano-constrictions in Pt/NiFe bilayers, we demonstrate that SHNOs can be scaled down to truly nanoscopic dimensions, with the added benefit of ultra-low operating currents and improved power conversion efficiency. The lateral confinement leads to a strong shape anisotropy field as well as an additional demagnetizing field whose reduction with increasing auto-oscillation amplitude can yield a positive current tunability contrary to the negative tunability commonly observed for localized excitations in extended magnetic layers. Micromagnetic simulations corroborate the experimental findings and suggest that the active magnetodynamic area resides up to 100 nm outside of the nano-constriction.
Place, publisher, year, edition, pages
RSC Publishing, 2017. Vol. 9, no 3, 1285-1291 p.
Materials properties, Nanostructured materials, Auto-oscillations, Demagnetizing field, Lateral confinement, Localized excitations, Low operating current, Micromagnetic simulations, Microwave signals, nocv1, Power conversion efficiencies, Microwave oscillators
IdentifiersURN: urn:nbn:se:kth:diva-202213DOI: 10.1039/c6nr07903bScopusID: 2-s2.0-85010417228OAI: oai:DiVA.org:kth-202213DiVA: diva2:1083017
Correspondence Address: Dürrenfeld, P.; School of Electronic Science and Engineering, Nanjing UniversityChina; email: firstname.lastname@example.org. QC 201703202017-03-202017-03-202017-03-20Bibliographically approved