Theory of magnetodynamics induced by spin torque in perpendicularly magnetized thin films
A nonlinear model of spin-wave excitation using a point contact in a thin ferromagnetic film is introduced. Large-amplitude magnetic solitary waves are computed, which help explain recent spin-torque experiments. Numerical simulations of the fully nonlinear model predict excitation frequencies in ex...
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| Published in | Physical review letters Vol. 95; no. 26; p. 267206 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
31.12.2005
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| Online Access | Get more information |
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| Abstract | A nonlinear model of spin-wave excitation using a point contact in a thin ferromagnetic film is introduced. Large-amplitude magnetic solitary waves are computed, which help explain recent spin-torque experiments. Numerical simulations of the fully nonlinear model predict excitation frequencies in excess of 0.2 THz for contact diameters smaller than 6 nm. Simulations also predict a saturation and redshift of the frequency at currents large enough to invert the magnetization under the point contact. The theory is approximated by a cubic complex Ginzburg-Landau type equation. The mode's nonlinear frequency shift is found by use of perturbation techniques, whose results agree with those of direct numerical simulations. |
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| AbstractList | A nonlinear model of spin-wave excitation using a point contact in a thin ferromagnetic film is introduced. Large-amplitude magnetic solitary waves are computed, which help explain recent spin-torque experiments. Numerical simulations of the fully nonlinear model predict excitation frequencies in excess of 0.2 THz for contact diameters smaller than 6 nm. Simulations also predict a saturation and redshift of the frequency at currents large enough to invert the magnetization under the point contact. The theory is approximated by a cubic complex Ginzburg-Landau type equation. The mode's nonlinear frequency shift is found by use of perturbation techniques, whose results agree with those of direct numerical simulations. |
| Author | Silva, T J Ablowitz, M J Ilan, B Pufall, M R Hoefer, M A |
| Author_xml | – sequence: 1 givenname: M A surname: Hoefer fullname: Hoefer, M A email: hoefer@colorado.edu organization: Department of Applied Mathematics, University of Colorado, Boulder, 80309-0526, USA. hoefer@colorado.edu – sequence: 2 givenname: M J surname: Ablowitz fullname: Ablowitz, M J – sequence: 3 givenname: B surname: Ilan fullname: Ilan, B – sequence: 4 givenname: M R surname: Pufall fullname: Pufall, M R – sequence: 5 givenname: T J surname: Silva fullname: Silva, T J |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/16486396$$D View this record in MEDLINE/PubMed |
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| Title | Theory of magnetodynamics induced by spin torque in perpendicularly magnetized thin films |
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