Nonequilibrium dynamics in a spin valve with noncollinear magnetization

Smorka, Rudolf; Baláž, Pavel; Thoss, Michael; Žonda, Martin

doi:10.1103/physrevb.106.144435

Cited by 2 publications

(2 citation statements)

References 89 publications

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“…Therefore, the dynamics of the magnetic junction is reduced to the central part only. To describe the dynamics of the magnetic junction, we use a hierarchical equations of motion approach [102][103][104]. For the case of non-interacting fermions and single-particle properties studied in this paper, the hierarchy of equations of motion for the auxiliary density matrices terminates at the second tier exactly [105][106][107][108][109][110][111][112].…”

Section: Quantum-classical Equations Of Motionmentioning

confidence: 99%

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Dynamics of spin relaxation in nonequilibrium magnetic nanojunctions

Smorka,

Thoss,

Žonda

2024

New J. Phys.

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We investigate nonequilibrium phenomena in magnetic nano-junctions using a numerical approach that combines classical spin dynamics with the hierarchical equations of motion technique for quantum dynamics of conduction electrons. Our focus lies on the spin dynamics, where we observe non-monotonic behavior in the spin relaxation rates as a function of the coupling strength between the localized spin and conduction electrons. Notably, we identify a distinct maximum at intermediate coupling strength, which we attribute to a competition that involves the increasing influence of the coupling between the classical spin and electrons, as well as the influence of decreasing local density of states at the Fermi level. Furthermore, we demonstrate that the spin dynamics of a large open system can be accurately simulated by a short chain coupled to semi-infinite metallic leads. In the case of a magnetic junction subjected to an external DC voltage, we observe resonant features in the spin relaxation, reflecting the electronic spectrum of the system. The precession of classical spin gives rise to additional side energies in the electronic spectrum, which in turn leads to a broadened range of enhanced damping in the voltage.

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Section: Quantum-classical Equations Of Motionmentioning

confidence: 99%

“…In this work, we utilize a variation of these techniques, namely a QC equations of motion (QC-EOM) approach for open quantum systems [15,102]. QC-EOM is a QC method which combines the equations of motion for the classical spins with the hierarchical equations of motion technique for the conduction electrons [103,104].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of spin relaxation in nonequilibrium magnetic nanojunctions

Smorka,

Thoss,

Žonda

2024

New J. Phys.

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Theoretical study of electronic structures, magnetic properties, and ultrafast spin manipulation in transition metal adsorbed polycyclic-aromatic-hydrocarbon molecules

Xie,

Ma,

et al. 2024

The Journal of Chemical Physics

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We present a first-principles study of the structural, electronic, and magnetic properties of TM(PAH)0/+ (TM = Fe, Co, Ni; PAH = C10H8, C16H10, C24H12, C32H14) complexes and explore the laser-induced spin dynamics as well as their stability with respect to various laser parameters. For each complex, the most stable configuration shows that the TM atom prefers to adsorb at the hollow site of the carbon ring with a slight deviation from the center. The electronic structure and spin localization of the complexes are found to be largely affected by the TM type. Driven by various laser pulses, spin-crossover scenarios are achieved in all structures, while spin-transfer between TM and PAH is achieved in Ni(C10H8), Ni(C16H10), and Ni(C24H12). The influence of the laser energy and chirp on the dynamics is also investigated, providing important information regarding the stability and sensitivity of the dynamical process. All results are believed to reveal the physics nature of the TM–PAH systems, to guide the experimental realization of their ultrafast spin dynamics and thus to promote their applications in future spintronics.

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Nonequilibrium dynamics in a spin valve with noncollinear magnetization

Cited by 2 publications

References 89 publications

Dynamics of spin relaxation in nonequilibrium magnetic nanojunctions

Dynamics of spin relaxation in nonequilibrium magnetic nanojunctions

Theoretical study of electronic structures, magnetic properties, and ultrafast spin manipulation in transition metal adsorbed polycyclic-aromatic-hydrocarbon molecules

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