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Tunable mode coupling in nano-contact spin torque oscillators
- Publication Year :
- 2017
-
Abstract
- Recent experiments on spin torque oscillators have revealed interactions between multiple magnetodynamic modes, including mode-coexistence, mode-hopping, and temperature-driven cross-over between modes. Initial multimode theory has indicated that a linear coupling between several dominant modes, arising from the interaction of the subdynamic system with a magnon bath, plays an essential role in the generation of various multimode behaviors, such as mode hopping and mode coexistence. In this work, we derive a set of rate equations to describe the dynamics of coupled magnetodynamic modes in a nano-contact spin torque oscillator. Expressions for both linear and nonlinear coupling terms are obtained, which allow us to analyze the dependence of the coupled dynamic behaviors of modes on external experimental conditions as well as intrinsic magnetic properties. For a minimal two-mode system, we further map the energy and phase difference of the two modes onto a two-dimensional phase space, and demonstrate in the phase portraits, how the manifolds of periodic orbits and fixed points vary with external magnetic field as well as with temperature.<br />13 pages, 8 figures; 2 figures (Figs.5 & 6) corrected and redrawn; 2 new figures (Figs.7 & 8) added; Accepted by Physical Review Applied
- Subjects :
- Physics
Work (thermodynamics)
Condensed Matter - Materials Science
Phase portrait
Condensed matter physics
Condensed Matter - Mesoscale and Nanoscale Physics
F300
Magnon
General Physics and Astronomy
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
02 engineering and technology
Rate equation
Fixed point
021001 nanoscience & nanotechnology
01 natural sciences
Magnetic field
Phase space
0103 physical sciences
Mode coupling
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
010306 general physics
0210 nano-technology
Subjects
Details
- Language :
- English
- ISSN :
- 23317019
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....971a3c3c213e27c61a60658e93f10a7e