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Microwave Signal Ge...
Microwave Signal Generation in Single-Layer Nano-Contact Spin Torque Oscillators
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Sani, S. R. (författare)
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- Dürrenfeld, Philipp (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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Mohseni, S.M. (författare)
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Chung, Sunjae, 1976 (författare)
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Åkerman, Johan, 1970 (författare)
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(creator_code:org_t)
- Institute of Electrical and Electronics Engineers (IEEE), 2013
- 2013
- Engelska.
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Ingår i: Ieee Transactions on Magnetics. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9464 .- 1941-0069. ; 49:7, s. 4331-4334
- Relaterad länk:
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https://gup.ub.gu.se...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We demonstrate spin transfer torque (STT) driven microwave signal generation, from about 250 MHz to above 3 GHz, in single perm alloy layers underneath a nano-contact with diameter of 100 nm. The threshold current for signal generation is found to be strongly hysteretic, the microwave signal shows a number of harmonics, zero-field operation is straightforward, and the microwave frequency increases quasi-linearly with drive current. All observations are consistent with STT driven motion of a vortex-antivortex pair nucleated by the Oersted field underneath the nano-contact. While the generated power is about 10 dB smaller than the best GMR based nano-contact spin torque oscillators, the linewidth of 6-100 MHz is of the same order.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- Single layer
- spin torque oscillator
- vortex
- POLARIZED CURRENT
- DRIVEN
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- art (ämneskategori)
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