High-harmonic generation in spin and charge current pumping at ferromagnetic or antiferromagnetic resonance in the presence of spin-orbit coupling

Manjarres, Jalil Varela; Nikolić, Branislav K.

doi:10.48550/arxiv.2112.14685

Cited by 2 publications

(16 citation statements)

References 51 publications

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“…currents pumped into the NM lead p = L, R. The calculation of I Sz p , which is steady-state in the absence of SO coupling [11], for 1D toy model of the AFI/NM interface in figure 5 confirm the difference between its LH and RH precession modes pumping of spin currents into the NM leads. In fact, these results (figures 5(b) and (c)) that are quite similar (independently of whether L and R leads are identical or not) to those (figure 4) obtained for realistic Cu/MnF 2 /Cu and Pt/MnF 2 /Cu heterostructures described by much more complex ncDFT Hamiltonians.…”

Section: Comparison With Spin Pumping From 1d Tb Model Of Afi/nm Inte...supporting

confidence: 54%

“…In figure 4, we use k y × k z = 25 × 25 grid of k-points. Thus, Floquet-NEGF formalism replaces the original time-dependent NEGF [11,43,44] problem with time-independent one at the cost of using infinite-dimensional matrices Ǒ due to infinite dimensionality of H T . However, in practice finite |n| ⩽ N max is chosen where this range can be expanded until the answer converges, thereby yielding a nonperturbative result.…”

Section: Charge Conserving Solution Of Floquet-negf Equations For Pum...mentioning

confidence: 99%

“…The matrices ρ neq (t) = ℏG < (t, t ′ )/i and Π p (t) are expressed in terms of time-dependent NEGFs [42,43] or integrals (in the case of Π p (t)) over them, as elaborated in references [44]. The Π p (t) matrices yield generally time-dependent [11] charge…”

Section: Comparison With Spin Pumping From 1d Tb Model Of Afi/nm Inte...mentioning

confidence: 99%

“…The reason for this is that spin pumping stems from processes at the FM/NM interface [5] that is always thinner than the phase coherence length. It can be accompanied by pumped charge current as well, on the proviso that the left-right symmetry of the device is broken statically [5,6] or if spin-orbit (SO) coupling is present at the FM/NM interface [7][8][9][10] or in the bulk [11] of FM layer, with DC component of pumped charge current scaling with precession frequency as ∝ω 2 [5,6,12,13] in the former or as ∝ω [7,8] in the latter case.…”

Section: Introductionmentioning

confidence: 99%

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Spin pumping from antiferromagnetic insulator spin-orbit-proximitized by adjacent heavy metal: a first-principles Floquet-nonequilibrium Green function study

2022

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Motivated by recent experiments [P. Vaidya {\em et al.}, Science {\bf 368}, 160 (2020)] on spin pumping from sub-THz-microwave-driven uniaxial antiferromagnetic insulator (AFI) MnF$_2$ into heavy metal (HM) Pt with strong spin-orbit (SO) coupling, we compute and compare pumped spin currents in Cu/MnF$_2$/Cu and Pt/MnF$_2$/Cu heterostructures. Recent theories of spin pumping by AFI have relied on simplistic Hamiltonians (such as tight-binding) and the scattering approach to quantum transport yielding the so-called interfacial spin mixing conductance (SMC), but the concept of SMC is inapplicable when SO coupling is present directly at the interface. In contrast, we use a more general first-principles quantum transport approach which combines noncollinear density functional theory Hamiltonian with Floquet-nonequilibrium Green functions in order to take into account {\em SO-proximitized} AFI due to adjacent HM; SO coupling at interfaces; and evanescent wavefunctions penetrating from Pt or Cu into AFI layer to make its interfacial region {\em conducting}. The DC component of pumped spin current $I_\mathrm{DC}^{S_z}$ vs. precession cone angle $\theta_{\vb*{l}}$ of the N\'{e}el vector $\vb*{l}$ of AFI {\em does not} follow putative $I^{S_z}_\mathrm{DC} \propto \sin^2 \theta_{\vb*{l}}$, except for very small angles $\theta_{\vb*{l}} \lesssim 10^\circ$ for which we define an {\em effective} SMC from the prefactor and find that it doubles from MnF$_2$/Cu to MnF$_2$/Pt interface. In addition, the angular dependence $I^{S_z}_\mathrm{DC}(\theta_{\vb*{l}})$ differs for opposite directions of precession of the N\'{e}el vector, thereby leading to twice as large SMC for the right-handed as for the left-handed chirality of the precession modes of localized magnetic moments within AFI at resonance.

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Section: Comparison With Spin Pumping From 1d Tb Model Of Afi/nm Inte...supporting

confidence: 54%

Section: Charge Conserving Solution Of Floquet-negf Equations For Pum...mentioning

confidence: 99%

Section: Comparison With Spin Pumping From 1d Tb Model Of Afi/nm Inte...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spin pumping from antiferromagnetic insulator spin-orbit-proximitized by adjacent heavy metal: a first-principles Floquet-nonequilibrium Green function study

2022

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“…[12]. * ousmane.ly@kaust.edu.sa Recently, two studies [13,14] have appeared, where mainly the claimed scaling up of the number of the harmonics was criticized, and the ultrahigh harmonic regime underlying ref. [12] was deemed to be a result of numerical bugs.…”

Section: Introductionmentioning

confidence: 99%

Noncollinear antiferromagnetic textures driven high-harmonic generation from magnetic dynamics in the absence of spin-orbit coupling

2023

J. Phys.: Condens. Matter

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We demonstrate the generation of high order harmonics in carrier pumping from precessing ferromagnetic or antiferromagnetic orders, excited via magnetic resonance, in the presence of topological antiferromagnetic textures. This results in an enhancement of the carrier dynamics by orders of magnitude, enabling for an emission deep in the THz frequency range. Interestingly, the generation process occurs in an intrinsic manner, and is solely governed by the interplay between the s-d exchange coupling underlying the noncollinear antiferromagnetic order and the dynamical s-d exchange constant of the magnetic drive. Therefore, the relativistic spin-orbit interaction is not required for the emergence of high harmonics in the pumped currents. Accordingly, the noncollinear topological antiferromagnetic order is presented as an alternative to spin-orbit interaction for the purpose of harnessing high harmonic emission in carrier pumping. Furthermore, we demonstrate the emergence of high harmonics from random magnetic defects. This suggests the universality of the magnetically induced high harmonic emission in the presence of real and/or momentum space noncollinear textures. Our proposal initiates a tantalizing prospect for the utilization of topological textures in the context of the highly active domains of ultrafast spintronics and THz emission.

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High-harmonic generation in spin and charge current pumping at ferromagnetic or antiferromagnetic resonance in the presence of spin-orbit coupling

Cited by 2 publications

References 51 publications

Spin pumping from antiferromagnetic insulator spin-orbit-proximitized by adjacent heavy metal: a first-principles Floquet-nonequilibrium Green function study

Spin pumping from antiferromagnetic insulator spin-orbit-proximitized by adjacent heavy metal: a first-principles Floquet-nonequilibrium Green function study

Noncollinear antiferromagnetic textures driven high-harmonic generation from magnetic dynamics in the absence of spin-orbit coupling

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