TITLE

Phase-locking and frustration in an array of nonlinear spin-torque nano-oscillators

AUTHOR(S)
Tiberkevich, Vasil; Slavin, Andrei; Bankowski, Elena; Gerhart, Grant
PUB. DATE
December 2009
SOURCE
Applied Physics Letters;12/28/2009, Vol. 95 Issue 26, p262505
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We demonstrate that the cooperative dynamics of an array of coupled spin-torque nano-oscillators (STNO) can be controlled by introduction of an additional external phase shift βc between microwave current, which couples STNOs, and microwave voltage on the array. When this external phase shift βc compensates the intrinsic phase shift β0, caused by the STNO nonlinearity, a phase-locking regime with increased output power and vanishing inhomogeneous linewidth broadening is achieved. In the opposite case, when external and intrinsic phase shifts are added, the STNO array demonstrates a frustration regime with low output power and wide and noisy frequency spectrum.
ACCESSION #
47244468

 

Related Articles

  • Analysis of phase shifts due to etching in photoreflectance spectra of a GaAs/AlGaAs single-quantum well structure. Hosea, T. J. C.; Hughes, P. J.; Weiss, B. L. // Journal of Applied Physics;3/15/1995, Vol. 77 Issue 6, p2672 

    Attempts to demonstrate that phase shifts can be explained by changes in the optical path length of the probe beam as it propagates through material whose thickness is reduced as the sample is etched. Phase analysis of the photoreflectance (PR) spectra; Expression for the complex PR signal.

  • Broadband frequency-comb spectroscopy. Schewe, Phillip F. // Physics Today;Mar2008, Vol. 61 Issue 3, p18 

    The article describes how three physicists at the National Institute of Science and Technology (NIST) in Boulder, Colorado detected each individual optical frequency comb. The three physicists sent the signal comb through a gas sample to be analyzed. The group measured the spectrum of hydrogen...

  • Phase separation kinetics in a binary mixture of polyethylene glycol and polypropylene glycol... Steinhoff, B.; Rullmann, M.; kuhne, L. // Journal of Chemical Physics;10/1/1997, Vol. 107 Issue 13, p5217 

    Studies the phase separation kinetics of fluid mixtures of polyethylene glycol/polypropylene glycol. Pressure jump from the homogeneous one-phase region into the two-phase region of the phase diagram; Specific interactions caused by hydrogen bonding; Occurrence of a pinning effect.

  • Measurement of dynamic polarization modulation depth utilizing the J1–J4 method of spectrum analysis. Sudarshanam, V. S.; Desu, S. B. // Review of Scientific Instruments;Jul1994, Vol. 65 Issue 7, p2337 

    A spectrum analysis method for the linear, direct, and self-consistent measurement of dynamic modulation depth of polarization modulators is presented. This method utilizes the Bessel recurrence relation to determine the modulation depth from the photodetector voltage amplitudes at tile...

  • Controlling phase multistability in coupled period-doubling oscillators. Shabunin, A. V. // Chaos;Mar2013, Vol. 23 Issue 1, p013102 

    A simple method of switching between coexisting attractors in two coupled period-doubling oscillators is proposed. It is based on 'pulling' phases of oscillations into suitable value by means of two periodic forces which simultaneously influence the both sub-systems. The frequency and the...

  • Observation of negative refraction and negative phase velocity in left-handed metamaterials. Aydin, Koray; Guven, Kaan; Soukoulis, Costas M.; Ozbay, Ekmel // Applied Physics Letters;3/21/2005, Vol. 86 Issue 12, p124102 

    We report the transmission characteristics of a two-dimensional (2D) composite metamaterial (CMM) structure in free space. At the frequencies where left-handed transmission takes place, we experimentally confirmed that the CMM structure has effective negative refractive index. Phase shift...

  • Low temperature cell for cavity ring down absorption studies. Lewis, Ernest K.; Moehnke, Craig J.; Navea, Juan G.; Manzanares, Carlos E. // Review of Scientific Instruments;Jul2006, Vol. 77 Issue 7, p073107 

    Phase shift cavity ring down is a technique that due to its long optical path length is an ideal method to detect weak absorptions. Coupling the method to a custom fitted cryostat allows gas phase molecules to be studied at cryogenic temperatures in a thermally isolated vacuum chamber. A novel...

  • High order dispersion control for femtosecond CPA lasers. Osvay, K.; VarjÚ, K.; Kurdi, G. // Applied Physics B: Lasers & Optics;Dec2007, Vol. 89 Issue 4, p565 

    Taking advantage of the temperature dependence of the refractive index, an arrangement is proposed for thermal control of dispersion of a chirped pulse amplification (CPA) laser. A glass slab, inserted into the Fourier plane of a stretcher or a compressor, having a spatially varying temperature...

  • Optical Nonlinearity and Bistability in Semiconductors. Ekpekpo, A. // Journal of Applied Sciences Research;Dec2010, Vol. 6 Issue 12, p2230 

    Semiconductors exhibit large optical non-linearities near the band edge due to resonance enhancement. The free exciton, bound exciton, biexciton, electron - hole plasma, and intensity -dependent resonance broadening in large gap semiconductors, such as Cucl, cds, and GaAs, and band filling due...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics