Tuning Magnetic Droplets in Nanocontact Spin-Torque Oscillators Using Electric Fields

Zheng, Cuixiu; Dvornik, Mykola; Wang, Chengjie; Xiao, Dunhui; Liu, Yaowen; Zhang, Zongzhi; Zhou, Yan; Mazraati, Hamid; Ahlberg, Martina; Awad, Ahmad A.; Åkerman, Johan

doi:10.1103/physrevapplied.14.054001

Cited by 7 publications

(4 citation statements)

References 60 publications

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“…Figure 5 shows the spatial distribution of m z and the effect field H eff r along the radius for different w md . Here, the m z is directly extracted from the micromagnetic simulation results shown in figure 2, while the effect field H eff r is calculated based on the equation (11) and distribution obtained from simulation. As depicted in figure 5(a), the w md manipulates the spatial distribution of the m z , and the increase in w md expands the area tilting m trends antiparallel to the center part.…”

Section: Resultsmentioning

confidence: 99%

“…broad range of frequencies, low working voltages, and the ability to dynamically modulate the output signals [1,2]. The major types of STNOs can be divided into magnetic single domains [3,4], domain walls [5][6][7][8], vortices [9,10], droplets [11], and skyrmions [12][13][14], according to the main magnetization texture in the free layer. Magnetic skyrmions are quasi-particle-like topologically nonlinear nanoscale spin configurations, which are typically stabilized in materials with perpendicular magnetic anisotropy (PMA) and interfacial Dzyaloshinskii-Moriya interaction (iDMI) [15,16].…”

Section: Introductionmentioning

confidence: 99%

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A ferromagnetic skyrmion-based spin-torque nano-oscillator with modified edge magnetization

Luo,

Yu,

et al. 2024

J. Phys. D: Appl. Phys.

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Magnetic skyrmion-based spin-torque nano-oscillators (STNOs) have attracted significant interest because of their potential applications as microwave signal emitters and integrability in the existing CMOS process flow. However, the stable circular motion of the skyrmion in the nanodisk is affected by the Magnus force, which can destroy and annihilate the skyrmion at the nanodisk edge, thereby limiting the application of the maximum oscillation frequency. To overcome this problem, we investigated the influence of a modified magnetized structure at the edge of the nanodisk on the oscillation dynamics of skyrmions, in which the modified magnetized profile is acquired by local modification of the magnetic material parameters, and these skyrmions can move along the tilting magnetization formatted wall. It was found that the upper threshold for steady skyrmion oscillations can be improved by approximately two times compared to the standard structure without modified edge magnetization profiles. Based on the effective field analysis, we confirmed that the spatial distribution of the tilting moment at the edge layer changed the effective field distribution and caused a non-monotonic change in the upper threshold current with the modified region width. Our results may provide an optional route for designing future skyrmion-based STNOs with better performance in the communication and computing areas.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A ferromagnetic skyrmion-based spin-torque nano-oscillator with modified edge magnetization

Luo,

Yu,

et al. 2024

J. Phys. D: Appl. Phys.

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“…The precession frequency is well below the FMR frequency and practically independent of the driving spin-polarized current [2,4]. However, it can be tuned by an applied electric field in STNOs with the free layer possessing electric-field-dependent PMA created by an adjacent dielectric layer [11].…”

Section: Introductionmentioning

confidence: 98%

Generation and routing of nanoscale droplet solitons without compensation of magnetic damping

Nikitchenko

Pertsev

2022

Phys. Rev. Materials

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“…Spin-torque nano-oscillators (STNOs) , are spintronic nanodevices utilizing spin torques to excite spin precession. These nanoscale nonlinear oscillators are capable of generating various magnetodynamic modes, such as propagating spin-waves, − localized bullets, , magnetic droplets, − dynamic vortex, , and dynamic skyrmions . During the past decades, tremendous attention has been paid to their applications in, for instance, signal generators, spectrum analyzers, , spin diodes, − wireless communication, − microwave-assisted magnetic random-access memories, , Ising machines, and neuromorphic computing, − due to their capability of generating highly tunable ultrawide microwave signals ranging from hundreds of megahertz to tens of gigahertz …”

mentioning

confidence: 99%

Field-Free High-Frequency Exchange-Spring Spin-Torque Nano-Oscillators

Jiang

Chung

et al. 2023

Nano Lett.

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Spin-torque nano-oscillators (STNOs) are a type of nanoscale microwave auto-oscillators utilizing spin-torque to generate magnetodynamics with great promise for applications in microwaves, magnetic memory, and neuromorphic computing. Here, we report the first demonstration of exchange-spring STNOs, with an exchange-spring ([Co/Pd]-Co) reference layer and a perpendicular ([Co/Ni]) free layer. This magnetic configuration results in high-frequency (>10 GHz) microwave emission at a zero magnetic field and exchange-spring dynamics in the reference layer and the observation of magnetic droplet solitons in the free layer at different current polarities. Our demonstration of bipolar and field-free exchange-spring-based STNOs operating over a 20 GHz frequency range greatly extends the design freedom and functionality of the current STNO technology for energy-efficient high-frequency spintronic and neuromorphic applications.

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Tuning Magnetic Droplets in Nanocontact Spin-Torque Oscillators Using Electric Fields

Cited by 7 publications

References 60 publications

A ferromagnetic skyrmion-based spin-torque nano-oscillator with modified edge magnetization

A ferromagnetic skyrmion-based spin-torque nano-oscillator with modified edge magnetization

Generation and routing of nanoscale droplet solitons without compensation of magnetic damping

Field-Free High-Frequency Exchange-Spring Spin-Torque Nano-Oscillators

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