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Propagating spin wa...
Propagating spin waves excited by spin-transfer torque: A combined electrical and optical study
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Madami, M. (author)
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- Iacocca, Ezio, 1986 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),University of Gothenburg,Chalmers tekniska högskola,Chalmers University of Technology
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- Redjai Sani, Sohrab (author)
- KTH,Materialfysik, MF
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Gubbiotti, G. (author)
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Tacchi, S. (author)
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- Dumas, Randy K. (author)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),University of Gothenburg
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- Åkerman, Johan, 1970 (author)
- KTH,Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),University of Gothenburg,Materialfysik, MF
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Carlotti, G. (author)
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(creator_code:org_t)
- 2015
- 2015
- English.
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In: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 2469-9950 .- 2469-9969 .- 1550-235X. ; 92:2
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Abstract
Subject headings
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- Nanocontact spin-torque oscillators are devices in which the generation of propagating spin waves can be sustained by spin transfer torque. In the present paper, we perform combined electrical and optical measurements in a single experimental setup to systematically investigate the excitation of spin waves by a nanocontact spin-torque oscillator and their propagation in a Ni80Fe20 extended layer. By using microfocused Brillouin light scattering we observe an anisotropic emission of spin waves, due to the broken symmetry imposed by the inhomogeneous Oersted field generated by the injected current. In particular, spin waves propagate on the side of the nanocontact where the Oersted field and the in-plane component of the applied magnetic field are antiparallel, while propagation is inhibited on the opposite side. Moreover, propagating spin waves are efficiently excited only in a limited frequency range corresponding to wavevectors inversely proportional to the size of the nanocontact. This frequency range obeys the dispersion relation for exchange-dominated spin waves in the far field, as confirmed by micromagnetic simulations of similar devices. The present results have direct consequences for spin wave based applications, such as synchronization, computation, and magnonics.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Nanoteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Nano-technology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
Keyword
- Magnetic Droplet Solitons
- Nano-Oscillators
- Phase-Locking
- Devices
- Excitation
- Excitation
Publication and Content Type
- ref (subject category)
- art (subject category)
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Madami, M.
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Iacocca, Ezio, 1 ...
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Redjai Sani, Soh ...
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Gubbiotti, G.
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Tacchi, S.
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Dumas, Randy K.
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Åkerman, Johan, ...
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Carlotti, G.
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- 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 ...
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and Atom and Molecul ...
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Materials Engine ...
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Physical Review ...
- By the university
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University of Gothenburg
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Chalmers University of Technology
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Royal Institute of Technology