Long-range mutual synchronization of spin Hall nano-oscillators

Awad, Ahmad A.; Dürrenfeld, Philipp; Houshang, Afshin; Dvornik, Mykola; Iacocca, Ezio; Dumas, Randy K.; Åkerman, Johan

doi:10.1038/nphys3927

Cited by 266 publications

(215 citation statements)

References 57 publications

(36 reference statements)

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“…The mutual, as well as self, synchronization of the spin torque induced magnetization oscillation by using spin waves, electric current, microwave field, or dipole coupling has been an exciting topic from the viewpoints of both nonlinear science and practical applications [46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62] . The key quantity of the synchronization is the phase difference ∆ϕ between each magnetization to enhance the emission power from the spin torque oscillators and to investigate new practical applications such as neuromorphic architectures 38,39 .…”

Section: A Transverse Geometrymentioning

confidence: 99%

Dynamic coupling of ferromagnets via spin Hall magnetoresistance

Taniguchi

2017

Phys. Rev. B

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The synchronized magnetization dynamics in ferromagnets on a nonmagnetic heavy metal caused by the spin Hall effect is investigated theoretically. The direct and inverse spin Hall effects near the ferromagnetic/nonmagnetic interface generate longitudinal and transverse electric currents. The phenomenon is known as the spin Hall magnetoresistance effect, whose magnitude depends on the magnetization direction in the ferromagnet due to the spin transfer effect. When another ferromagnet is placed onto the same nonmagnet, these currents are again converted to the spin current by the spin Hall effect and excite the spin torque to this additional ferromagnet, resulting in the excitation of the coupled motions of the magnetizations. The in-phase or antiphase synchronization of the magnetization oscillations, depending on the value of the Gilbert damping constant and the field-like torque strength, is found in the transverse geometry by solving the Landau-Lifshitz-Gilbert equation numerically. On the other hand, in addition to these synchronizations, the synchronization having a phase difference of a quarter of a period is also found in the longitudinal geometry. The analytical theory clarifying the relation among the current, frequency, and phase difference is also developed, where it is shown that the phase differences observed in the numerical simulations correspond to that giving the fixed points of the energy supplied by the coupling torque.

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Section: A Transverse Geometrymentioning

confidence: 99%

Dynamic coupling of ferromagnets via spin Hall magnetoresistance

Taniguchi

2017

Phys. Rev. B

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“…To date, most SHNOs have been based on NiFe/ Pt, 2,[13][14][15][16][17][18][19][20] YIG/Pt, 21,22 and CoFeB/Pt, 23 with SOT produced by a Pt layer. Many other heavy metals, such as W, 10,11 IrCu, 24,25 and CuBi, 26 have however been investigated, revealing that the so-called spin Hall angle (h SH ), which describes the charge current to spin current conversion efficiency, can exceed that of Pt.…”

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confidence: 99%

Low operational current spin Hall nano-oscillators based on NiFe/W bilayers

Mazraati

Chung

Houshang

et al. 2016

Applied Physics Letters

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Low operational current spin Hall nano-oscillators based on NiFe/W bilayers. Letters, 109(24) We demonstrate highly efficient spin Hall nano-oscillators (SHNOs) based on NiFe/b-W bilayers. Thanks to the very high spin Hall angle of b-W, we achieve more than a 60% reduction in the autooscillation threshold current compared to NiFe/Pt bilayers. The structural, electrical, and magnetic properties of the bilayers, as well as the microwave signal generation properties of the SHNOs, have been studied in detail. Our results provide a promising path for the realization of low-current SHNO microwave devices with highly efficient spin-orbit torque from b-W. Published by AIP Publishing. Applied Physics

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“…It is favorable for applications, since the large volume of auto-oscillation region reduces the sensitivity to thermal fluctuations and facilitates the implementation of systems comprised of interacting nano-oscillators. 12,13 In conclusion, we have demonstrated spin-Hall nano-oscillators based on magnetic …”

Section: 12mentioning

confidence: 99%

Nanoconstriction spin-Hall oscillator with perpendicular magnetic anisotropy

Divinskiy

Demidov

Kozhanov

et al. 2017

Applied Physics Letters

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We experimentally study spin-Hall nano-oscillators based on [Co/Ni] multilayers with perpendicular magnetic anisotropy. We show that these devices are capable of singlefrequency auto-oscillations at current densities comparable to those in the in-plane magnetized oscillators. The demonstrated oscillators exhibit large magnetization precession amplitudes, and their oscillation frequency is highly tunable by the electric current. These features make them promising for applications in high-speed integrated microwave circuits.

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Long-range mutual synchronization of spin Hall nano-oscillators

Cited by 266 publications

References 57 publications

Dynamic coupling of ferromagnets via spin Hall magnetoresistance

Dynamic coupling of ferromagnets via spin Hall magnetoresistance

Low operational current spin Hall nano-oscillators based on NiFe/W bilayers

Nanoconstriction spin-Hall oscillator with perpendicular magnetic anisotropy

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