Enhancement of frequency by tuning in-plane magnetic field in spin-torque oscillator

Arun, R.; Gopal, R.; Chandrasekar, V. K.; Lakshmanan, M.

doi:10.1016/j.jmmm.2021.167989

Cited by 6 publications

(9 citation statements)

References 40 publications

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“…Nevertheless, the magnitudes of the critical currents can be decreased further by decreasing the volume of the free layer. To confirm that this is indeed true, we have plotted the critical currents I low c and I upp c for different volumes of the free layer, namely V 1 = 2×π×60×60 nm 3 [23,29,37], V 2 = 2×π×50×50 nm 3 , V 3 = 1×π×60×60 nm 3 , V 4 = 2.5×64×64 nm 3 [13] and V 5 = 3×30×30 nm 3 [40]. The results are shown in Fig.…”

Section: Impact Of Free Layer Volume On Critical Currentsmentioning

confidence: 66%

“…We have verified that when the magneto-crystalline anisotropy is along the positive zdirection the short-inplane field triggers no magnetization oscillations and the magnetization only settles at (1,0,0) for positive current and at (-1,0,0) for negative current irrespective of field-like torque. The free layer with out-of-plane magneto-crystalline anisotropy exhibits the possibility of oscillations with a frequency range of ∼6 GHz only in the presence of a continuous perpendicular field [23].…”

Section: B Frequency and Power Spectral Densitymentioning

confidence: 99%

“…A further enhancement of frequency in the STNOs with parallelly magnetized free layer has been achieved by applying an in-plane field [19][20][21][22][23] or by tilting the pinned layer's magnetization to out-of-plane [24][25][26][27][28][29]. In particular, Bonetti et al have experimentally observed the tunability of the frequency by current, magnetic field strength and magnetic field direction in nanocontact based STNOs [19].…”

Section: Introductionmentioning

confidence: 99%

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Spin Torque Oscillations Triggered by In-plane Field

Arun,

Gopal,

Chandrasekar

et al. 2021

Preprint

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We study the dynamics of a spin torque nano oscillator that consists of parallelly magnetized free and pinned layers by numerically solving the associated Landau-Lifshitz-Gilbert-Slonczewski equation in the presence of a field-like torque. We observe that an in-plane magnetic field which is applied for a short interval of time (<1ns) triggers the magnetization to exhibit self-oscillations from low energy initial magnetization state. Also, we confirm that the frequency of oscillations can be tuned over the range ∼25 GHz to ∼72 GHz by current, even in the absence of field-like torque. We find the frequency enhancement up to 10 GHz by the presence of field-like torque. We determine the Q-factor for different frequencies and show that it increases with frequency. Our analysis with thermal noise confirms that the system is stable against thermal noise and the dynamics is not altered appreciably by it.

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Section: Impact Of Free Layer Volume On Critical Currentsmentioning

confidence: 66%

Section: B Frequency and Power Spectral Densitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spin Torque Oscillations Triggered by In-plane Field

Arun,

Gopal,

Chandrasekar

et al. 2021

Preprint

Self Cite

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“…Intensive efforts have been devoted to manipulating the oscillation frequencies by tuning the external in-plane magnetic field in the ferromagnetic nano contact spin-valve systems [44][45][46][47][48]. The oscillation frequency is up to more than 60 GHz in a uniformly magnetized STO by tuning the in-plane magnetic field [49]. However, for a ferromagnetic skyrmion-based STO, the oscillation frequency usually is only a few GHz.…”

Section: Introductionmentioning

confidence: 99%

Spin-Torque Oscillator Based on Magnetic Domain and Meron

Zhang

Cao

et al. 2022

Front. Phys.

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In this work, micromagnetic simulations demonstrate that a steady oscillation mode accompanied by magnetic domain splitting and the creation and annihilation of meron can be excited by spin-polarized currents. It is found that the in-plane magnetic anisotropy and Dzyaloshinskii-Moriya interaction (DMI) have a greater influence on the oscillation frequency. The oscillation frequency can vary from 3 GHz to 31 GHz by controlling anisotropy strength under a fixed current density. By changing DMI strength, the oscillation frequency varies from 9 to 13.6 GHz and from 29.7 to 37 GHz. Compared with ferromagnetic skyrmion-based spin-torque oscillators (STOs), the STOs based on this magnetic domain and meron further increase the oscillation frequency. Our results may provide theoretical support for the research and development of future high-frequency STOs.

show abstract

Section: Introductionmentioning

confidence: 99%

Spin Torque Oscillations Triggered by In-plane Field

Arun¹,

Gopal²,

Chandrasekar³

et al. 2021

J. Phys.: Condens. Matter

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We study the dynamics of a spin torque nano oscillator that consists of parallelly magnetized free and pinned layers by numerically solving the associated Landau-Lifshitz-Gilbert-Slonczewski equation in the presence of a field-like torque. We observe that an in-plane magnetic field which is applied for a short interval of time ($<$1ns) triggers the magnetization to exhibit self-oscillations from low energy initial magnetization state. Also, we confirm that the frequency of oscillations can be tuned over the range $\sim$25 GHz to $\sim$72 GHz by current, even in the absence of field-like torque. We find the frequency enhancement up to 10 GHz by the presence of field-like torque. We determine the Q-factor for different frequencies and show that it increases with frequency. Our analysis with thermal noise confirms that the system is stable against thermal noise and the dynamics is not altered appreciably by it.

show abstract

Enhancement of frequency by tuning in-plane magnetic field in spin-torque oscillator

Cited by 6 publications

References 40 publications

Spin Torque Oscillations Triggered by In-plane Field

Spin Torque Oscillations Triggered by In-plane Field

Spin-Torque Oscillator Based on Magnetic Domain and Meron

Spin Torque Oscillations Triggered by In-plane Field

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