Nutation spin waves in ferromagnets

Titov, S. V.; Dowling, William J.; Kalmykov, Yuri P.; Cherkasskii, Mikhail

doi:10.1103/physrevb.105.214414

Cited by 13 publications

(6 citation statements)

References 33 publications

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“…Obtained analytical expressions for the dynamical susceptibility

of the vortex-state nanodots (8,9) are similar to those calculated [ 2 , 7 ] or simulated [ 12 ] recently for uniformly magnetized samples. However, as noticed in [ 24 ], all parameters in the dynamical susceptibility of the vortex state dot (intensities, resonance frequencies, linewidths) are essentially different from ones for uniformly magnetized particles.…”

Section: Resultssupporting

confidence: 81%

“…Quite recently, the topic of nutations in the magnetization dynamics have attracted essential attention due to the resonance effects that manifest themselves in the high-frequency range at pico- and femtosecond timescales [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. Ultrafast spin dynamics remains the subject of crucial importance for the spintronic applications and high-speed spintronic devices based on magnetic nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

“…[ 9 , 10 ], considered several aspects of magnetization dynamics in the inertial mode, including spin waves, ferromagnetic resonance, s–d electron interactions, spin current torques, etc. [ 2 , 7 , 11 , 12 , 13 , 14 , 15 ]. As it appears, the nutations can be treated by an effective mechanism, allowing them to explain the features of ultrafast magnetization dynamics related, in particular, to the impact of magnetization “inertia”.…”

Section: Introductionmentioning

confidence: 99%

“…It was assumed that the nutation effects can be described on the base of a term proportional to the 2nd order derivative of the magnetization, with respect to time, multiplied by the coefficient, η [ 9 ]. In most publications, η was considered to be proportional to the magnetization dissipation parameter (α) and nutation time (τ) [ 4 , 7 , 13 , 16 , 17 ], in several others, η is taken as an α-independent parameter [ 8 , 18 ]. The emergence of the nutation term can be interpreted on the basis of the angular momentum conservation law [ 17 ] and the magnetization precession in the presence of neighboring magnetic atoms in a crystalline environment.…”

Section: Introductionmentioning

confidence: 99%

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Nutation Excitations in the Gyrotropic Vortex Dynamics in a Circular Magnetic Nanodot

Gareeva

Guslienko

2023

Nanomaterials

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A significant activity is devoted to the investigation of the ultrafast spin dynamic processes, holding a great potential for science and applications. However, a challenge of the understanding of the mechanisms of underlying spin dynamics in nanomaterials at pico- and femtosecond timescales remains under discussion. In this article, we explore the gyrotropic vortex dynamics in a circular soft magnetic nanodot, highlighting the impacts given by nutations in the high-frequency part of the dot spin excitation spectrum. Using a modified Thiele equation of the vortex core motion with a nutation term, we analyze the dynamic response of the vortex to an oscillating magnetic field applied in the dot plane. It is found that nutations affect the trajectory of the vortex core. Namely, we show that the directions of the vortex core motion in the low-frequency gyrotropic mode and the high-frequency nutation mode are opposite. The resonant frequencies of gyrotropic and nutational vortex core motions reveal themselves on different scales: gigahertz for the gyrotropic motion and terahertz for the nutations. We argue that the nutations induce a dynamic vortex mass, present estimates of the nutational mass, and conduct comparison with the mass appearing due to moving vortex interactions with spin waves and Doering domain wall mass.

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“…Obtained analytical expressions for the dynamical susceptibility

Section: Resultssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nutation Excitations in the Gyrotropic Vortex Dynamics in a Circular Magnetic Nanodot

Gareeva

Guslienko

2023

Nanomaterials

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“…1. Schematic illustration of magnetization dynamics [40] (The precessional motion of around is depicted by the blue solid dashed curve, and the nutationis shown by the red curve).…”

Section: H Effmentioning

confidence: 99%

Inertial magnetization dynamics on femtosecond scale

Li,

Nan,

et al. 2023

Acta Phys. Sin.

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In the sub-picosecond to femtosecond time scale, the inertia effect should be considered in the dynamics of magnetization in ferromagnet, which can be described by the inertial Landau-Lifshitz-Gilbert equation. This paper mainly introduces some theoretical and experimental developments of ultrafast ferromagnetic resonance, magnetization reversal and inertial spin dynamics. These results will help to better understand the basic mechanism of ultrafast demagnetization and magnetization reversal, while it will deepen the understanding of the microscopic mechanism of magnetic inertia. Also, it will reveal the development trend of future experimental and theoretical research.

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