2014
DOI: 10.1063/1.4898093
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Modulation bandwidth of spin torque oscillators under current modulation

Abstract: For practical applications of spin torque nano-oscillators (STNO), one of the most critical characteristics is the speed at which an STNO responds to variations of external control parameters, such as current or/and field. Theory predicts that this speed is limited by the amplitude relaxation rate Γp that determines the timescale over which the amplitude fluctuations are damped out. In this study, this limit is verified experimentally by analyzing the amplitude and frequency noise spectra of the output voltage… Show more

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Cited by 38 publications
(32 citation statements)
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“…3) Modulation rate: When the modulation frequency of an STNO is increased, the STNO may not be perfectly modulated. A recent study has shown that the upper limit of the frequency of modulation in an MTJ-STNO is 200 MHz [164]. In this work, the authors showed that the bandwidth of modulation is limited by the amplitude relaxation rate Γ p and that the power level of amplitude modulation strongly decreases beyond f m > f p , where f p = Γ p /π.…”
Section: Modulation Properties 1) Modulation Of Uniform Mode Stnosmentioning
confidence: 66%
“…3) Modulation rate: When the modulation frequency of an STNO is increased, the STNO may not be perfectly modulated. A recent study has shown that the upper limit of the frequency of modulation in an MTJ-STNO is 200 MHz [164]. In this work, the authors showed that the bandwidth of modulation is limited by the amplitude relaxation rate Γ p and that the power level of amplitude modulation strongly decreases beyond f m > f p , where f p = Γ p /π.…”
Section: Modulation Properties 1) Modulation Of Uniform Mode Stnosmentioning
confidence: 66%
“…A large number of possibilities opens the door for the use of magnetic nanowires as different components of nanoscale devices. In this line, we propose that bent cylindrical magnetic nanowires can be engineered for nanoscale communication technologies, similar to spin-torque nano-oscillators [5][6][7][8][9]. This statement is based on the fact that when a domain wall moves under the action of a magnetic field or electric current in these nanowires, it oscillates around and along the wire axis [10][11][12], and the frequency can be controlled by the nanowire geometry and external magnetic field.…”
Section: Introductionmentioning
confidence: 99%
“…When the ac spin torque frequency is lower than the Néel–Brown attempt frequency for thermally activated switching 53 , antidamping spin torque can significantly amplify the amplitude of thermally-induced magnetization precession in the half-cycle of the ac drive when spin torque acts as antidamping 54 and thereby induce switching over the energy barrier. It has been previously shown that efficient amplification of the free layer magnetization amplitude by ac spin torque drive is limited to frequencies below the free layer magnetization relaxation rate, which typically does not exceed 1 GHz 55 .…”
Section: Discussionmentioning
confidence: 99%