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Spatial mapping of ...
Spatial mapping of torques within a spin Hall nano-oscillator
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- Spicer, T. M. (author)
- Univ Exeter, Dept Phys & Astron, Exeter EX4 4QL, Devon, England.
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- Keatley, P. S. (author)
- Univ Exeter, Dept Phys & Astron, Exeter EX4 4QL, Devon, England.
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- Loughran, T. H. J. (author)
- Univ Exeter, Dept Phys & Astron, Exeter EX4 4QL, Devon, England.
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- Dvornik, M. (author)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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- Awad, Ahmad (author)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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- Durrenfeld, P. (author)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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- Houshang, Afshin (author)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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- Ranjbar, M. (author)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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- Åkerman, Johan (author)
- Gothenburg University,Göteborgs universitet,KTH,Material- och nanofysik,Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden.,Institutionen för fysik (GU),Department of Physics (GU)
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- Kruglyak, V. V. (author)
- Univ Exeter, Dept Phys & Astron, Exeter EX4 4QL, Devon, England.
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- Hicken, R. J. (author)
- Univ Exeter, Dept Phys & Astron, Exeter EX4 4QL, Devon, England.
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Univ Exeter, Dept Phys & Astron, Exeter EX4 4QL, Devon, England Institutionen för fysik (GU) (creator_code:org_t)
- AMER PHYSICAL SOC, 2018
- 2018
- English.
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In: Physical Review B. - : AMER PHYSICAL SOC. - 2469-9950 .- 2469-9969. ; 98:21
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://gup.ub.gu.se...
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Abstract
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- 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.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Nanoteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Nano-technology (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Spicer, T. M.
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Keatley, P. S.
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Loughran, T. H. ...
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Dvornik, M.
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Awad, Ahmad
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Durrenfeld, P.
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show more...
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Houshang, Afshin
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Ranjbar, M.
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Åkerman, Johan
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Kruglyak, V. V.
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Hicken, R. J.
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show less...
- About the subject
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Nano technology
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
- Articles in the publication
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Physical Review ...
- By the university
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Royal Institute of Technology
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University of Gothenburg