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Spatial mapping of torques within a spin Hall nano-oscillator
Univ Exeter, Dept Phys & Astron, Exeter EX4 4QL, Devon, England..
Univ Exeter, Dept Phys & Astron, Exeter EX4 4QL, Devon, England..
Univ Exeter, Dept Phys & Astron, Exeter EX4 4QL, Devon, England..
Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden..
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2018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 98, no 21, article id 214438Article in journal (Refereed) Published
Abstract [en]

Time-resolved scanning Kerr microscopy (TRSKM) was used to study precessional magnetization dynamics induced by a radio frequency (RF) current within a Al2O3/Py(5 nm)/Pt(6 nm)/Au(150 nm) spin Hall nano-oscillator structure. The Au layer was formed into two needle-shaped electrical contacts that concentrated the current in the center of a Py/Pt mesa of 4 mu m diameter. Due to the spin Hall effect, current within the Pt layer drives a spin current into the Py layer, exerting a spin transfer torque (STT). By injecting RF current and exploiting the phase sensitivity of TRSKM and the symmetry of the device structure, the STT and Oersted field torques have been separated and spatially mapped. The STT and torque due to the in-plane Oersted field are observed to exhibit minima at the device center that is ascribed to spreading of RF current that is not observed for DC current. Torques associated with the RF current may destabilize the position of the self-localized bullet mode excited by the DC current and inhibit injection locking. The present study demonstrates the need to characterize both DC and RF current distributions carefully.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2018. Vol. 98, no 21, article id 214438
National Category
Nano Technology
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URN: urn:nbn:se:kth:diva-241197DOI: 10.1103/PhysRevB.98.214438ISI: 000454420800006Scopus ID: 2-s2.0-85059507300OAI: oai:DiVA.org:kth-241197DiVA, id: diva2:1280878
Note

QC 20190121

Available from: 2019-01-21 Created: 2019-01-21 Last updated: 2019-01-21Bibliographically approved

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Åkerman, Johan

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