Influence of intersublattice coupling on the terahertz nutation spin dynamics in antiferromagnets

Mondal, Ritwik; Oppeneer, Peter M.

doi:10.1103/physrevb.104.104405

Cited by 17 publications

(7 citation statements)

References 57 publications

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“…First of all, we mention that the antiferromagnetic resonance frequencies fall in THz regime that is clearly visible in our results [69,70]. Moreover, we point out that although an isotropic damping of α = 0.05 have been employed for two sublattices, the effective damping is increased due to the exchange enhancement by an approximate factor (J + 2K)/ 4K(J + K) [67,71]. Such enhancement of damping for antiferromagnets can easily be observed in lower panel of figure 3.…”

Section: Antiferromagnetssupporting

confidence: 66%

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Theory of tensorial Gilbert damping in antiferromagnets

Dhali,

Mondal

2024

J. Phys.: Condens. Matter

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Although the magnetic Gilbert damping was considered as a scalar quantity in micromagnetic and atomistic spin simulations, recent investigations show that the Gilbert damping is a tensor. Here, we investigate the eﬀect of anisotropic and chiral damping in one-sublattice ferromagnets and two-sublattice antiferromagnets. We employ linear response theory to calculate the susceptibility with the damping tensor and determine the ferromagnetic and antiferromagnetic resonance frequencies and eﬀective damping. Our results show that apart from the scalar Gilbert damping, the antisymmetric chiral damping has a signiﬁcant contribution to the spin dynamics. To this end, we also compare the tensorial damping and cross-sublattice scalar damping in antiferromagnets.

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Section: Antiferromagnetssupporting

confidence: 66%

“…We have derived the susceptibility 4 × 4 matrix through equation ( 19) in a linear basis. However, considering I xy = I yx = 0 on both the sublattices, it is wiser to move to a circular basis where the susceptibility expression takes a simpler 2 × 2 matrix form [58,67].…”

Section: Antiferromagnetsmentioning

confidence: 99%

Theory of tensorial Gilbert damping in antiferromagnets

Dhali,

Mondal

2024

J. Phys.: Condens. Matter

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“…Moreover, the nutation resonance peak in antiferromagnet is exchangeenhanced. 65,66 The latter implies that antiferromagnetic nutation resonance should be better detected in the experiments. 65,67 Exploiting the nutation might enable advanced pathways for magnetization switching.…”

Section: A Inertial Dynamicsmentioning

confidence: 98%

A perspective on nonlinearities in coherent magnetization dynamics

Yang

Mondal

et al. 2022

Applied Physics Letters

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The recent thrust in ultrafast magnetization dynamics aims at extending spintronic functionalities to terahertz frequencies. Deterministic manipulation of magnetization at the corresponding ultrashort timescales requires minute control not only over the magnetization itself but also the reservoirs it is interacting with. Although the various intricate couplings between spins, phonons, and electrons-all of which are susceptible to ultrashort laser pulses-lead to many (often nonlinear) coupling routes, magnetization-dynamical nonlinearities have remained largely underexplored. In this Perspective, we highlight recent advances and foresee future developments in the rapidly evolving field of nonlinear magnetization dynamics. Given the elementary character of coherent excitations, we put particular emphasis on their nonlinearities. We briefly review theoretical aspects and assess excitation mechanisms to reach the nonlinear regime of magnetic excitations in a broad class of magnetic materials, such as ferromagnets, antiferromagnets, and ferrimagnets. We present an overview of the groundbreaking experiments that showcase the unique insights provided by magnetic nonlinearities. We conclude by discussing open challenges and opportunities that underpin the potential of nonlinear magnetization dynamics for the advancement of spintronics and cavity quantum electrodynamics with spin waves at terahertz frequencies.

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“…With the assumption that J H 0 M 0 and J K, we have Ω A ≈ Ω B ≈ γJ/M 0 . Therefore, the obtained approximate frequencies of the antiferromagnetic precession resonance (AFMR) and antiferromagnetic nutation resonance (AFMNR) are [48,51]…”

Section: Similar To Our Consideration Of Fm We Calculate the Afm Susc...mentioning

confidence: 99%

Spin pumping at terahertz nutation resonances

Mondal,

Kamra

2021

Preprint

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We investigate spin pumping current injected by the nutation resonances of a ferromagnet or an antiferromagnet into an adjacent metal. Comparing the dc spin pumping current between the normal precession and nutation resonances, we find that the ratio of spin pumping current at the nutation resonance to the precession resonance is more pronounced in antiferromagnets. We further show that the spin pumping current injected by the nutation resonance is opposite in sign as compared to the normal precession mode. This could offer a useful experimental signature for identifying such nutation resonances. Analyzing the nature of the nutational eigenmodes, we show that the sign change in spin current is rooted in a reversal of the precession sense for the nutation mode(s). Furthermore, the nutational modes in antiferromagnets are found to be dominated by precession of one of the two sublattices only.I.

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Influence of intersublattice coupling on the terahertz nutation spin dynamics in antiferromagnets

Cited by 17 publications

References 57 publications

Theory of tensorial Gilbert damping in antiferromagnets

Theory of tensorial Gilbert damping in antiferromagnets

A perspective on nonlinearities in coherent magnetization dynamics

Spin pumping at terahertz nutation resonances

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