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Parametric oscillator based on nonlinear vortex dynamics in low-resistance magnetic tunnel junctions.
- Source :
-
Physical Review B: Condensed Matter & Materials Physics . Oct2011, Vol. 84 Issue 14, p144434-1-144434-5. 5p. - Publication Year :
- 2011
-
Abstract
- Radiofrequency vortex spin-transfer oscillators based on magnetic tunnel junctions with very low-resistance area product were investigated. A high power of excitations has been obtained characterized by a power spectral density containing a very sharp peak at the fundamental frequency and a series of harmonics. The observed behavior is ascribed to the combined effect of spin-transfer torque and Oersted-Ampère field generated by the large applied dc current. We furthermore show that the synchronization of a vortex oscillation by applying an ac bias current is mostly efficient when the external frequency is twice the oscillator fundamental frequency. This result is interpreted in terms of a parametric oscillator. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10980121
- Volume :
- 84
- Issue :
- 14
- Database :
- Academic Search Index
- Journal :
- Physical Review B: Condensed Matter & Materials Physics
- Publication Type :
- Academic Journal
- Accession number :
- 70091474
- Full Text :
- https://doi.org/10.1103/physrevb.84.144434