Spin-current nano-oscillator based on nonlocal spin injection

Demidov, V. E.; Urazhdin, Sergei; Zholud, Andrei; Садовников, А. В.; Slavin, A. N.; Demokritov, S. O.

doi:10.1038/srep08578

Cited by 87 publications

(56 citation statements)

References 36 publications

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“…13(a), the magnetic moment carried by the spin current is antiparallel to the magnetization of the Py layer, resulting in the STT compensating the dynamic magnetic damping. When damping becomes completely compensated by the spin current, the magnetization of the Py layer starts to auto-oscillate in the area above the nanocontact [87]. Fig.…”

Section: Nonlocal Spin-injection Nano-oscillatorsmentioning

confidence: 98%

“…It was shown in Ref. [87] that the experimentally observed characteristics of the NLSI oscillators can be accurately described by a quasi-linear model that takes into account the enhancement by the spin current of the magnetic fluctuations in the Py film above the nanocontact. As was discussed in Section 2.2, the spin current-induced fluctuation enhancement can result in the reduction of the effective magnetization M e by more than 50% (Fig.…”

Section: Nonlocal Spin-injection Nano-oscillatorsmentioning

confidence: 99%

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Magnetization oscillations and waves driven by pure spin currents

et al. 2017

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Recent advances in the studies of pure spin currents -flows of angular momentum (spin) not accompanied by the electric currents -have opened new horizons for the emerging technologies based on the electron's spin degree of freedom, such as spintronics and magnonics. The main advantage of pure spin current, as compared to the spin-polarized electric current, is the possibility to exert spin transfer torque on the magnetization in thin magnetic films without electrical current flow through the material. In addition to minimizing Joule heating and electromigration effects, this characteristic enables the implementation of spin torque devices based on the low-loss insulating magnetic materials, and offers an unprecedented geometric flexibility. Here we review the recent experimental achievements in investigations of magnetization oscillations excited by pure spin currents in different magnetic nanosystems based on metallic and insulating magnetic materials. We discuss the spectral properties of spin-current nano-oscillators, and relate them to the spatial characteristics of the excited dynamic magnetic modes determined by the spatially-resolved measurements. We also show that these systems 2 support locking of the oscillations to external microwave signals, as well as their mutual synchronization, and can be used as efficient nanoscale sources of propagating spin waves.

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Section: Nonlocal Spin-injection Nano-oscillatorsmentioning

confidence: 98%

Section: Nonlocal Spin-injection Nano-oscillatorsmentioning

confidence: 99%

Magnetization oscillations and waves driven by pure spin currents

et al. 2017

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“…However, the linewidth of SHNOs is on the same order as that of STNOs, and their output power is currently lower than that of STNOs. Despite the issues with SHNOs, their advantages offer an opportunity to implement novel nanoscale microwave sources and emitters for wireless communications and magnonics applications [70], [138].…”

Section: B Shno-based Applications: State-of-the-art and Prospectsmentioning

confidence: 99%

Spin-Torque and Spin-Hall Nano-Oscillators

et al. 2016

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This paper reviews the state of the art in spin-torque and spin Hall effect driven nano-oscillators. After a brief introduction to the underlying physics, the authors discuss different implementations of these oscillators, their functional properties in terms of frequency range, output power, phase noise, and modulation rates, and their inherent propensity for mutual synchronization. Finally, the potential for these oscillators in a wide range of applications, from microwave signal sources and detectors to neuromorphic computation elements, is discussed together with the specific electronic circuitry that has so far been designed to harness this potential.

QS 2016

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“…Spin-Hall driven auto-oscillation of the quasi-uniform mode in an extended ferromagnetic film with uniformly applied spin-torque has been hampered by nonlinear magnon scattering processes that redistribute energy from the desired mode into a large number of degenerate spin wave modes [6]. Spin-Hall oscillators demonstrated to date have utilized either local, nanoscale excitation of a mode whose resonance frequency lies below the continuous spin wave dispersion of the extended FM film [2,[7][8][9], or have geometrically confined the excited mode (in, e.g., a nanowire) so that the degeneracies of the spin wave dispersion are strongly lifted [3,10,11]. The ability to engineer the magnon spectrum could permit systematic tuning of multi-mode interactions and detailed study of their implications for spin-Hall oscillators.…”

Section: Introductionmentioning

confidence: 99%

Engineering the Spectrum of Dipole Field-Localized Spin-Wave Modes to Enable Spin-Torque Antidamping

Zhang

Manuilov

et al. 2017

Phys. Rev. Applied

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Auto-oscillation of a ferromagnet due to spin-orbit torques in response to a dc current is of wide interest as a flexible mechanism for generating controllable high frequency magnetic dynamics. However, spin wave mode degeneracies and nonlinear magnon-magnon scattering impede coherent precession. Discretization of the spin wave modes can reduce this scattering. Spatial localization of the spin wave modes by the strongly inhomogeneous dipole magnetic field of a nearby spherical micromagnet provides variable spatial confinement, thus offering the option of systematic tunability of magnon spectrum for studying multi-mode interactions. Here we demonstrate that field localization generates a discrete spin wave mode spectrum observable as a series of well-resolved localized modes in the presence of imposed spin currents arising from the spin Hall effect (SHE) in a permalloy/platinum (Py/Pt) microstrip. The observation of linewidth reduction through damping control in this micromagnetically engineered spectrum demonstrates that localized modes can be controlled efficiently, an important step toward continuously tunable SHE driven auto-oscillators.

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Spin-current nano-oscillator based on nonlocal spin injection

Cited by 87 publications

References 36 publications

Magnetization oscillations and waves driven by pure spin currents

Magnetization oscillations and waves driven by pure spin currents

Spin-Torque and Spin-Hall Nano-Oscillators

Engineering the Spectrum of Dipole Field-Localized Spin-Wave Modes to Enable Spin-Torque Antidamping

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