Microwave magnetic field modulation of spin torque oscillator based on perpendicular magnetic tunnel junctions

Skowroński, Witold; Chęciński, Jakub; Ziętek, Sławomir; Yakushiji, Kay; Yuasa, Shinji

doi:10.1038/s41598-019-55220-9

Cited by 7 publications

(4 citation statements)

References 25 publications

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“…This mechanism is in contrast with that of the previous work 21 , where a mutual synchronization is the origin of the associative memory operation. Also, the method is different from the previous works 38 , 39 . In Ref.…”

Section: Discussionmentioning

confidence: 80%

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Associative memory by virtual oscillator network based on single spin-torque oscillator

Imai,

Taniguchi

2023

Sci Rep

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A coupled oscillator network may be able to perform an energy-efficient associative memory operation. However, its realization has been difficult because inhomogeneities unavoidably arise among the oscillators during fabrication and lead to an unreliable operation. This issue could be resolved if the oscillator network were able to be formed from a single oscillator. Here, we performed numerical simulations and theoretical analyses on an associative memory operation that uses a virtual oscillator network based on a spin-torque oscillator. The virtual network combines the concept of coupled oscillators with that of feedforward neural networks. Numerical experiments demonstrate successful associations of 60-pixel patterns with various memorized patterns. Moreover, the origin of the associative memory is shown to be forced synchronization driven by feedforward input, where phase differences among oscillators are fixed and correspond to the colors of the pixels in the pattern.

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Section: Discussionmentioning

confidence: 80%

“…In Ref. 39 , a delayed-feedback was used to generate input signal, while the input signal in the present work is generated by multiplying appropriated weight to perform the associative memory operation.…”

Section: Discussionmentioning

confidence: 99%

Associative memory by virtual oscillator network based on single spin-torque oscillator

Imai,

Taniguchi

2023

Sci Rep

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“…Their key features are frequency tunability (12), nanoscale size (10), broad working temperature (13), and easy integration with the standard silicon technology (6,14). As strongly nonlinear devices, STNOs can exhibit different dynamic regimes, which are promising candidates for various applications including microwave signal generation and detection (15)(16)(17), signal modulation (18), spin wave generation (19), neuromorphic computing (20)(21)(22), etc.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous multitone microwave emission by dc-driven spintronic nano-element

Hamadeh,

Slobodianiuk,

Moukhader

et al. 2023

Sci. Adv.

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Current-induced self-sustained magnetization oscillations in spin-torque nano-oscillators (STNOs) are promising candidates for ultra-agile microwave sources or detectors. While usually STNOs behave as a monochromatic source, we report here clear bimodal simultaneous emission of incommensurate microwave oscillations in the frequency range of 6 to 10 gigahertz at femtowatt level power. These two tones correspond to two parametrically coupled eigenmodes with tunable splitting. The emission range is crucially sensitive to the change in hybridization of the eigenmodes of free and fixed layers, for instance, through a slight tilt of the applied magnetic field from the normal of the nanopillar. Our experimental findings are supported both analytically and by micromagnetic simulations, which ascribe the process to four-magnon scattering between a pair of radially symmetric magnon modes and a pair of magnon modes with opposite azimuthal index. Our findings pave the way for enhanced cognitive telecommunications and neuromorphic systems that use frequency multiplexing to improve communication performance.

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“…The current density was set to 60 MA/m 2 . The parameters partially taken from[55], with the MTJ composition of CoFeB(2.5nm)/MgO (1nm)/CoFeB(1.8nm).…”

mentioning

confidence: 99%

A comprehensive simulation package for analysis of multilayer spintronic devices

Mojsiejuk¹,

Ziętek²,

Grochot³

et al. 2022

Preprint

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We present cmtj -a comprehensive simulation package that allows large-scale macrospin simulations for a variety of multilayer spintronics devices. Apart from conventional static simulations, such as magnetoresistance and magnetisation hysteresis loops, cmtj implements a mathematical model of dynamic experimental techniques commonly used for spintronics devices characterisation, for instance: spin diode ferromagnetic resonance, pulse-induced microwave magnetometry, or harmonic Hall voltage measurements. We demonstrate the accuracy of the macrospin simulations on a variety of examples, accompanied by some experimental results.

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Microwave magnetic field modulation of spin torque oscillator based on perpendicular magnetic tunnel junctions

Cited by 7 publications

References 25 publications

Associative memory by virtual oscillator network based on single spin-torque oscillator

Associative memory by virtual oscillator network based on single spin-torque oscillator

Simultaneous multitone microwave emission by dc-driven spintronic nano-element

A comprehensive simulation package for analysis of multilayer spintronic devices

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