Frequency modulation of spin-transfer oscillators
By M. Pufall, William H. Rippard, S. Kaka, T. Silva, S. Russek. 2004
165 citations recorded by the source corpus.
Spin-polarized dc electric current flowing into a magnetic layer can induce precession of the magnetization at a frequency that depends on current. We show that addition of an ac current to this dc bias current results in a frequency modulated (FM) spectral output, generating sidebands spaced at the modulation frequency. The sideband amplitudes and shift of the center frequency with drive amplitude are in good agreement with a nonlinear FM model that takes into account the nonlinear frequency-current relation generally induced by spin transfer. Single-domain simulations show that ac current modulates the cone angle of the magnetization precession, in turn modulating the frequency via the demagnetizing field. These results are promising for communications and signal processing applications of spin-transfer oscillators.
Subfields: Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/ac0b656885d32beae3adb52bdaa7a55afa51fb2d
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In Atomic and Molecular Physics, and Optics
- A. Slavin
- V. Tiberkevich
- Nicolas Locatelli
- Anders Eklund
- Ahmad A. Awad
- Ana Rusu
- Johan Åkerman
- B. Gunnar Malm
In Electronic, Optical and Magnetic Materials
Citations in the corpus
- Spin-Torque and Spin-Hall Nano-Oscillators (2015, background): “This phenomenon was first reported in [169] and was attributed to nonlinear”
- Spin-torque building blocks. (2014, background): “Furthermore, thanks to their intrinsic nonlinear nature, large bandwidths of frequency modulation can be achieved, which is crucial for signal processing [31].”
- Nonlinear Auto-Oscillator Theory of Microwave Generation by Spin-Polarized Current (2009, background): “Also, the data presented in [55] were taken at a single fixed modulation frequency , which makes the verification of the frequency dependence (37) and determination of the effective damping rate from these experimental data impossible.”