Linewidth of higher harmonics in a nonisochronous auto-oscillator: Application to spin-torque nano-oscillators

Quinsat, M.; Tiberkevich, Vasil; Gusakova, D.; Slavin, A. N.; Sierra, Juan F.; Ebels, U.; Buda-Prejbeanu, L. D.; Diény, B.; Cyrille, Marie-Claire; Zelster, A.; Katine, J. A.

doi:10.1103/physrevb.86.104418

Cited by 15 publications

(15 citation statements)

References 22 publications

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“…In an STNO, the magnetization of an active layer, typically referred to as the free layer, is subjected to an incident spin current. This spin current can be provided, for instance, by a direct current in a magnetoresistive device such as a spin valve or a magnetic tunneling junction [135][136][137][138][139] or by the inverse spin Hall effect in an adjacent heavy-metal layer [140,141]. Despite the various differences in geometry, magnetization configuration and material systems, all STNOs are based on the common principle that the incident spin current results in a spin transfer torque (STT) [134,143,144] acting on the magnetization of the free layer which counteracts the damping.…”

Section: Parametric Synchronization and Parametric Excitation In Spinmentioning

confidence: 99%

Parallel pumping for magnon spintronics: Amplification and manipulation of magnon spin currents on the micron-scale

2017

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Magnonics and magnon spintronics aim at the utilization of spin waves and magnons, their quanta, for the construction of wave-based logic networks via the generation of pure all-magnon spin currents and their interfacing with electrical charge transport. The promise of efficient parallel data processing and low power consumption renders this field one of the most promising research areas in spintronics. In this context, the process of parallel parametric amplification, i.e., the conversion of microwave photons into magnons at one half of the microwave frequency, has proven to be a versatile tool to excite and to manipulate spin waves. Its beneficial and unique properties such as frequency and mode-selectivity, the possibility to excite spin waves in a wide wavevector range and the creation of phase-correlated wave pairs, have enabled the achievement of important milestones like the magnon Bose Einstein condensation and the cloning and trapping of spinwave packets. Parallel parametric amplification, which allows for the selective amplification of magnons while conserving their phase is, thus, one of the key methods of spin-wave generation and amplification.The application of parallel parametric amplification to CMOS-compatible micro-and nanostructures is an important step towards the realization of magnonic networks. This is motivated not only by the fact that amplifiers are an important tool for the construction of any extended logic network but also by the unique properties of parallel parametric amplification. In particular, the creation of phase-correlated wave pairs allows for rewarding alternative logic operations such as a phase-dependent amplification of the incident waves. Recently, the successful application of parallel parametric amplification to metallic microstructures has been reported which constitutes an important milestone for the application of magnonics in practical devices. It has been demonstrated that parametric amplification provides an excellent tool to generate and to amplify spin waves in these systems in a wide wavevector range. In particular, the amplification greatly benefits from the discreteness of the spin-wave spectra since the size of the microstructures is comparable to the spin-wave wavelength. This opens up new, interesting routes of spin-wave amplification and manipulation. In this Review, we will give an overview over the recent developments and achievements in this field.

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Section: Parametric Synchronization and Parametric Excitation In Spinmentioning

confidence: 99%

Parallel pumping for magnon spintronics: Amplification and manipulation of magnon spin currents on the micron-scale

2017

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“…Another approach to study synchronization properties of STOs, based not on the exact microscopic equations (Eqs. (2) below), but on general equations for self-sustained oscillators has been proposed in 1,17 and followed in 9,18,19 . Because here the resulting dynamics is only suggested based on general qualitative arguments, but not derived from the microscopic equations, predictions for synchronization properties do not extend beyond standard qualitative ones.…”

mentioning

confidence: 99%

Robust synchronization of spin-torque oscillators with anLCRload

Pikovsky

2013

Phys. Rev. E

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We study dynamics of a serial array of spin-torque oscillators with a parallel inductor-capacitor-resistor (LCR) load. In a large range of parameters the fully synchronous regime, where all the oscillators have the same state and the output field is maximal, is shown to be stable. However, not always such a robust complete synchronization develops from a random initial state; in many cases nontrivial clustering is observed, with a partial synchronization resulting in a quasiperiodic or chaotic mean-field dynamics.

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“…The coupling strength is directly controlled by the perpendicular field applied on the system as it allows to bring the frequencies closer to each other. Then, for each of the coupling strentghs, we can perform systematic time domain measurements thanks to the high TMR ratio of our sensing junction, and, after Hilbert transformations, extract separately the power spectral densities of phase and amplitude noises [36].…”

Section: Tunable Nonlinear Behavior Driven By Mode Couplingmentioning

confidence: 99%

Driven energy transfer between coupled modes in spin-torque oscillators

et al. 2017

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The mutual interaction between the different eigenmodes of a spin-torque oscillator can lead to a large variety of physical mechanisms from mode hopping to multimode generation, that usually reduce their performances as radiofrequency devices. To tackle this issue for the future applications, we investigate the properties of a model spin-torque oscillator that is composed of two coupled vortices with one vortex in each of the two magnetic layers of the oscillator. In such double-vortex system, the remarkable properties of energy transfer between the coupled modes, one being excited by spin transfer torque while the second one being damped, result into an alteration of the damping parameters. As a consequence, the oscillator nonlinear behavior is concomitantly drastically impacted. This efficient coupling mechanism, driven mainly by the dynamic dipolar field generated by the spin transfer torque induced motion of the vortices, gives rise to an unusual dynamical regime of self-resonan... The mutual interaction between the different eigenmodes of a spin-torque oscillator can lead to a large variety of physical mechanisms from mode hopping to multimode generation, that usually reduce their performances as radio-frequency devices. To tackle this issue for the future applications, we investigate the properties of a model spin-torque oscillator that is composed of two coupled vortices with one vortex in each of the two magnetic layers of the oscillator. In such double-vortex system, the remarkable properties of energy transfer between the coupled modes, one being excited by spin transfer torque while the second one being damped, result into an alteration of the damping parameters. As a consequence, the oscillator nonlinear behavior is concomitantly drastically impacted. This efficient coupling mechanism, driven mainly by the dynamic dipolar field generated by the spin transfer torque induced motion of the vortices, gives rise to an unusual dynamical regime of self-resonance excitation. These results show that mode coupling can be leveraged for controlling the synchronization process as well as the frequency tunability of spin-torque oscillators.

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Linewidth of higher harmonics in a nonisochronous auto-oscillator: Application to spin-torque nano-oscillators

Cited by 15 publications

References 22 publications

Parallel pumping for magnon spintronics: Amplification and manipulation of magnon spin currents on the micron-scale

Parallel pumping for magnon spintronics: Amplification and manipulation of magnon spin currents on the micron-scale

Robust synchronization of spin-torque oscillators with anLCRload

Driven energy transfer between coupled modes in spin-torque oscillators

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