Robust phase shift keying modulation method for spin torque nano-oscillator

Zeng, Lang; Liu, Yang; Chen, Hao-Hsuan; Zhou, Yan; Zhang, Deming; Zhang, Youguang; Zhao, Weisheng

doi:10.1088/1361-6528/ab925a

Cited by 9 publications

(1 citation statement)

References 42 publications

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“…The digital signal used in the modulation does not require a radio-frequency mixer in demodulation, and the data can be encoded by two distinct frequencies or two distinct oscillation amplitudes, approaches that are defined as binary frequency-shift keying (BFSK) or binary amplitude-shift keying (BASK), respectively. The FSK and ASK modulations for STNOs based on magnetization precession have been intensively demonstrated by controlling an injected DC current, since it allows for particularly simple and compact device designs that can be easily integrated [ 28 , 29 ]. In these works, the actual modulation method is on-off keying and the modulation speed can be as high as 1.48 Gbps with a theoretical 1 ns turn-on time [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Design of a Radial Vortex-Based Spin-Torque Nano-Oscillator in a Strain-Mediated Multiferroic Nanostructure for BFSK/BASK Applications

et al. 2022

Micromachines

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Radial vortex-based spin torque nano-oscillators (RV-STNOs) have attracted extensive attention as potential nano microwave signal generators due to their advantages over other topological states, such as their higher oscillation, higher microwave power, and lower power consumption. However, the current driving the oscillation frequency of the STNOs must be limited in a small range of adjustment, which means less data transmission channels. In this paper, a new RV-STNO system is proposed with a multiferroic nanostructure, which consists of an ultrathin magnetic multilayer and a piezoelectric layer. Phase diagrams of oscillation frequency and amplitude with respect to piezostrain and current are obtained through micromagnetic simulation. The results show that the threshold current density of −4000-ppm compressive strain-assisted RV-STNOs is reduced from 2 × 109 A/m2 to 2 × 108 A/m2, showing one order of magnitude lower than that of conventional current-driven nano-oscillators. Meanwhile, the range of oscillation frequency adjustment is significantly enhanced, and there is an increased amplitude at the low oscillation point. Moreover, a promising digital binary frequency-shift key (BFSK) and binary amplitude-shift key (BASK) modulation technique is proposed under the combined action of current pulse and piezostrain pulse. They can transmit bit signals and show good modulation characteristics with a minimal transient state. These results provide a reference for developing the next generation of spintronic nano-oscillators with a wide frequency range and low power consumption, showing potential for future wireless communication applications.

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Section: Introductionmentioning

confidence: 99%

Design of a Radial Vortex-Based Spin-Torque Nano-Oscillator in a Strain-Mediated Multiferroic Nanostructure for BFSK/BASK Applications

et al. 2022

Micromachines

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Spintronic Neuromorphic Devices

Zhang

Wang

et al. 2021

Neuromorphic Devices for Brain‐Inspired Computing

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Realization of mutual synchronization of spin torque nano-oscillators under room temperature by noise reduction technique

Zeng

Chen

et al. 2020

Applied Physics Letters

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The pragmatic use of Spin Torque Nano-Oscillators (STNOs) in real electronic systems is severely hindered due to their low output power and poor noise figure. The most accepted and promising way to increase the output power and decrease the signal noise of STNOs is through their mutual synchronization. However, it is confused that the mutual synchronization of STNOs is very difficult to achieve at room temperature although the non-linear nature of STNOs contributes to the large frequency range of injection locking. In this work, first, it is revealed that the difficulty of STNOs' mutual synchronization stems from the high output signal noise of STNOs. Based on this observation, a noise reduction technique is invented, which introduces a Band Pass Filter in the coupling loop of STNOs. Using the noise reduction technique, it is demonstrated that even non-identical STNOs can be mutually synchronized at room temperature.

show abstract

Robust phase shift keying modulation method for spin torque nano-oscillator

Cited by 9 publications

References 42 publications

Design of a Radial Vortex-Based Spin-Torque Nano-Oscillator in a Strain-Mediated Multiferroic Nanostructure for BFSK/BASK Applications

Design of a Radial Vortex-Based Spin-Torque Nano-Oscillator in a Strain-Mediated Multiferroic Nanostructure for BFSK/BASK Applications

Spintronic Neuromorphic Devices

Realization of mutual synchronization of spin torque nano-oscillators under room temperature by noise reduction technique

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