Magnetization Dynamics Including Thermal Fluctuations: Basic Phenomenology, Fast Remagnetization Processes and Transitions Over High‐energy Barriers

Berkov, D. V.

doi:10.1002/9780470022184.hmm204

Cited by 17 publications

(19 citation statements)

References 71 publications

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“…This has a straightforward implementation in the macrospin approximation. Micromagnetically, it is usually implemented as fluctuations that are uncorrelated in both time and space [174]. It has been noted [175], that no rigorous theory has been presented to explain the effects of spatial fluctuations on the spin-wave eigenmodes.…”

Section: Phase Noisementioning

confidence: 99%

Spin-Torque and Spin-Hall Nano-Oscillators

et al. 2016

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This paper reviews the state of the art in spin-torque and spin Hall effect driven nano-oscillators. After a brief introduction to the underlying physics, the authors discuss different implementations of these oscillators, their functional properties in terms of frequency range, output power, phase noise, and modulation rates, and their inherent propensity for mutual synchronization. Finally, the potential for these oscillators in a wide range of applications, from microwave signal sources and detectors to neuromorphic computation elements, is discussed together with the specific electronic circuitry that has so far been designed to harness this potential.

QS 2016

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Section: Phase Noisementioning

confidence: 99%

Spin-Torque and Spin-Hall Nano-Oscillators

et al. 2016

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QS 2016

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“…The justification of this approach within numerical micromagnetics, where several interactions between elementary moments (discretization cells) do exist, is discussed in detail in [31]. We note also that in systems submitted to spin-transfer torques, an additional source of noise exists, namely spin current fluctuations.…”

Section: Slonczmentioning

confidence: 99%

Spin-torque driven magnetization dynamics: Micromagnetic modeling

Berkov

Miltat

2008

Journal of Magnetism and Magnetic Materials

172

126

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In this paper we present an overview of recent progress made in the understanding of the spintorque induced magnetization dynamics in nanodevices using mesoscopic micromagnetic simulations. We first specify how a spin-torque term may be added to the usual LandauLifshitz-Gilbert equation of magnetization motion and detail its physical meaning. After a brief description of spin-torque driven dynamics in the macrospin approximation, we discuss the validity of this approximation for various experimentally relevant geometries. Next, we perform a detailed comparison between accurate experimental data obtained from nanopillar devices and corresponding numerical modelling. We show that, on the one hand, many qualitatively important features of the observed magnetization dynamics (e.g., non-linear frequency shift and frequency jumps with increasing current) can be satisfactory explained by sophisticated micromagnetic models, but on the other hand, understanding of these experiments is still far from being complete. We proceed with the numerical analysis of pointcontact experiments, where an even more complicated magnetization dynamics is observed. Simulations reveal that such a rich behaviour is due to the formation of several strongly nonlinear oscillation modes. In the last part of the paper we emphasize the importance of sample characterization and conclude with some important remarks concerning the relation between micromagnetic modelling and real experiments.

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“…Note that there is a subtle difference between a local microscopic damping parameter λ i and a macroscopic damping parameter, as measured for a material in an experiment, usually denoted as α 22 , the Gilbert damping. Although the intrinsic damping is also known to be temperature dependent 23 , this intrinsic temperature dependence, naturally included in the atomistic approach, is normally ignored in the modelling of magnetization dynamics 24,25 .…”

Section: Atomistic Spin Dynamics Model Of Gd/fe Multilayersmentioning

confidence: 99%

Thermally induced magnetization switching in Gd/Fe multilayers

Ostler

Chantrell

2016

Phys. Rev. B

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A theoretical model of Gd/Fe multilayers is constructed using the atomistic spin dynamics formalism. By varying the thicknesses and number of layers we have shown that a strong dependence of the energy required for thermally induced magnetization switching (TIMS) is present; the larger the number of interfaces, the lower the energy required. The results of the layer resolved dynamics show that the reversal process of the multilayered structures, similarly to a GdFeCo alloy is driven by the antiferromagnetic interaction between the transition metal and rare earth components. Finally, whilst the presence of the interface drives the reversal process we show here that the switching process does not initiate at the surface but from the layers furthest from it; a departure from the alloy behavior which expands the classes of material types exhibiting TIMS.

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Magnetization Dynamics Including Thermal Fluctuations: Basic Phenomenology, Fast Remagnetization Processes and Transitions Over High‐energy Barriers

Cited by 17 publications

References 71 publications

Spin-Torque and Spin-Hall Nano-Oscillators

Spin-Torque and Spin-Hall Nano-Oscillators

Spin-torque driven magnetization dynamics: Micromagnetic modeling

Thermally induced magnetization switching in Gd/Fe multilayers

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