Calculating the transport properties of magnetic materials from first principles including thermal and alloy disorder, noncollinearity, and spin-orbit coupling

Starikov, A.A.; Liu, Yi; Yuan, Zhe; Kelly, Paul J.

doi:10.1103/physrevb.97.214415

Cited by 60 publications

(127 citation statements)

References 144 publications

(315 reference statements)

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“…3, where the experimental data are shown together with our results and also with calculations of Starikov et al [26], who modeled the temperature-induced disorder by means of supercells. Our calculation of ρ aver accounts quite well for the trend but the agreement with experiment is less good than for the calculations of Starikov et al [26]. A possible reason for this may be the different models used to describe the thermal disorder by Starikov et al [26] (supercells) and by us (CPA [21]).…”

Section: Calculation Of Transport Quantitiessupporting

confidence: 74%

“…Our calculation of ρ aver accounts quite well for the trend but the agreement with experiment is less good than for the calculations of Starikov et al [26]. A possible reason for this may be the different models used to describe the thermal disorder by Starikov et al [26] (supercells) and by us (CPA [21]).…”

Section: Calculation Of Transport Quantitiescontrasting

confidence: 46%

“…This is done in Fig. 3, where the experimental data are shown together with our results and also with calculations of Starikov et al [26], who modeled the temperature-induced disorder by means of supercells. Our calculation of ρ aver accounts quite well for the trend but the agreement with experiment is less good than for the calculations of Starikov et al [26].…”

Section: Calculation Of Transport Quantitiesmentioning

confidence: 57%

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Transport properties of doped permalloy via ab initio calculations: Effect of host disorder

et al. 2020

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Transport properties of permalloy doped with V, Co, Pt, and Au are explored via ab-initio calculations. The Kubo-Bastin formula is evaluated within the fully relativistic Korringa-Kohn-Rostoker Green function formalism. Finite temperature effects are treated by means of the alloy analogy model. It is shown that the fact that the host is disordered and not crystalline has a profound effect on how the conductivities characterizing the anomalous Hall effect and the spin Hall effect depend on the dopant concentration. Several relationships between quantities characterizing charge and spin transport are highlighted. The decrease of the longitudinal charge conductivity with increasing doping depends on the dopant type, following the sequence Co-Au-Pt-V. The dependence of the anomalous Hall and spin Hall conductivities on the dopant concentration is found to be non-monotonic. Introducing a finite temperature changes the overall trends significantly. The theoretical results are compared with available experimental data.

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Section: Calculation Of Transport Quantitiessupporting

confidence: 74%

Section: Calculation Of Transport Quantitiescontrasting

confidence: 46%

Section: Calculation Of Transport Quantitiesmentioning

confidence: 57%

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Transport properties of doped permalloy via ab initio calculations: Effect of host disorder

et al. 2020

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“…Data for L < 4 nm is excluded from the linear fit. 28 values of L not characteristic of the bulk material as illustrated in the inset to Fig. 1.…”

Section: Introductionmentioning

confidence: 94%

“…[23][24][25][26] For disordered materials, the linear dependence of the resistance R on the length L of the scattering region allows the interface contribution to be factored out by extracting the bulk resistivity from the linear part of R(L). 27,28 An analogous procedure can be applied to study the magnetization damping [27][28][29] where interfaces give rise to important observable effects. 1 In the case of spin-flipping, the exponential dependence on L of the transmission probability T σσ of states with spin σ from one lead into states with spin σ in the other lead makes this numerically challenging.…”

Section: Introductionmentioning

confidence: 99%

Calculating spin transport properties from first principles: Spin currents

et al. 2019

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Local charge and spin currents are evaluated from the solutions of fully relativistic quantum mechanical scattering calculations for systems that include temperature-induced lattice and spin disorder as well as intrinsic alloy disorder. This makes it possible to determine material-specific spin transport parameters at finite temperatures. Illustrations are given for a number of important materials and parameters at 300 K. The spin-flip diffusion length l sf of Pt is determined from the exponential decay of a spin current injected into a long length of thermally disordered Pt; we find l Pt sf = 5.3 ± 0.4 nm. For the ferromagnetic substitutional disordered alloy Permalloy (Py), we inject currents that are fully polarized parallel and antiparallel to the magnetization and calculate l sf from the exponential decay of their difference; we find l Py sf = 2.8 ± 0.1 nm. The transport polarization β is found from the asymptotic polarization of a charge current in a long length of Py to be β = 0.75 ± 0.01. The spin Hall angle ΘsH is determined from the transverse spin current induced by the passage of a longitudinal charge current in thermally disordered Pt; our best estimate is Θ Pt sH = 4.5±1% corresponding to the experimental room temperature bulk resistivity ρ = 10.8µΩ cm.arXiv:1901.00703v1 [cond-mat.mes-hall]

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Magnon Blockade and Magnon–Atom Entanglement Induced by a Qutrit Coupled to a Ferromagnetic YIG Sphere

2023

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Hybridized magnonic-photonic systems promise novel applications for future information processing technologies. Here, a hybrid magnonic system comprising of a qutrit (𝚲-type three-level atom) and a ferromagnetic YIG sphere is considered. Indeed, the whole system is driven by two light fields under the influence of the thermal environment. The indirect magnon-atom interaction is established via the virtual photon exchange. The associated Lindblad master equation is derived and its solution is found to investigate the nonclassical feature, especially in the steady-state solution. Generally, the system shows considerable nonclassicality, that is, strong magnon antibunching and magnon blockade. In fact, the feasibility of using such a hybrid system to prepare a single-magnon source based on magnon blockade effects we theoretically demonstrated. Besides, the considered system may be exploited to generate robust and stable magnon-atom entanglement. The appearance of magnon blockade and magnon-atom entanglement in the 𝚲-type atom may have its origin in the fact that the atom is trapped in different superposition states, induced by the quantum interference phenomenon. The proposed model and the corresponding results may open up an intriguing prospect to prepare a single-magnon source and provide further benefits through concatenating with photons in optomagnonic systems.

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Calculating the transport properties of magnetic materials from first principles including thermal and alloy disorder, noncollinearity, and spin-orbit coupling

Cited by 60 publications

References 144 publications

Transport properties of doped permalloy via ab initio calculations: Effect of host disorder

Transport properties of doped permalloy via ab initio calculations: Effect of host disorder

Calculating spin transport properties from first principles: Spin currents

Magnon Blockade and Magnon–Atom Entanglement Induced by a Qutrit Coupled to a Ferromagnetic YIG Sphere

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