Spin Dynamics in Magnetic Nano-Junctions

Smorka, Rudolf; Žonda, Martin; Thoss, Michael

doi:10.48550/arxiv.2109.03476

Cited by 1 publication

(7 citation statements)

References 124 publications

(193 reference statements)

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“…A similar relaxation effect can be obtained even for a short spacer layer by coupling the spin valve to semiinfinite metallic leads [56,92]. In addition, coupling to the leads allows us to address a system influenced by an external voltage drop [56].…”

Section: Spin Valve Dynamicsmentioning

confidence: 64%

“…We first show that the details of the electronic spectrum significantly influence the magnetization dynamics of the spin valve. In general, the spectrum is sensitive to the orientation of the classical spins and acquires time dependence through their dynamics [56,65]. Already a simple system of just two localized spins coupled through spin-dependent currents can have very complicated dynamics, including some chaotic regimes [42,82].…”

Section: Electronic Spectrummentioning

confidence: 99%

“…The effective coupling J eff is minimal when the magnetic splitting ∆ε is minimal. The reason is that the nonmagnetic states do not couple to the classical spin and can not mediate the effective exchange coupling [56]. Consequently, the largest J eff reflects the maximum in ∆ε and vice versa.…”

Section: Spin Valve Dynamicsmentioning

confidence: 99%

“…Despite these differences, the methods that combine classical localized spins with quantum conduction electrons are in a rather good qualitative agreement with the full quantum mechanical treatments [44,45,51,57] and capture most of its details. As such, these hybrid techniques proved to be extremely useful in the investigation of various phenomena not described by classical or adiabatic LLG based approaches, e.g., geometrical torque [51], magnetic inertia [15], chiral spin and charge pumping [49], formation of some nontrivial magnetic textures [53,64] or resonant dependence of the spin damping on voltage [56,65]. In addition, they are generalizable to realistic band structures [50].…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we use a quantum-classical equations of motion (QC-EOM) approach for open quantum systems [15,56], to study the dynamics of a spin valve system sandwiched between two metallic leads with finite voltage difference. QC-EOM is an Ehrenfest-type method [39,66,67] used, e.g., to study nuclear dynamics in quantum transport [68,69] or current-induced bond rupture in single-molecule junctions [70].…”

Section: Introductionmentioning

confidence: 99%

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Nonequilibrium dynamics in a spin valve with non-collinear magnetization

Smorka¹,

Baláž²,

Thoss³

et al. 2022

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We utilize a hybrid quantum-classical equation of motion approach to investigate the spin dynamics and spin-transfer torque in a spin valve under bias voltage. We show that the interplay between localized classical magnetic moments and conduction electrons induces a complex effective exchange coupling between the magnetic layers. This leads to a declination of magnetizations from layer anisotropy axes even in equilibrium. Introducing a finite bias voltage triggers spin currents and related spin transfer torques which further tilt the magnetizations and govern the relaxation processes of the spin dynamics. Analyzing different scenarios of the applied bias voltage, we show that symmetric and asymmetric voltage drops can lead to relaxation times of the spin dynamics that differ by several orders of magnitude at comparable charge currents. In both cases we observe resonant features, where the relaxation is boosted whenever the chemical potential of the leads matches the maxima in the density of the states of the spin-valve electrons.

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Section: Spin Valve Dynamicsmentioning

confidence: 64%