Magnetization switching in the inertial regime

Neeraj, Kumar; Pancaldi, Matteo; Scalera, Valentino; Perna, Salvatore; d’Aquino, M.; Serpico, C.; Bonetti, Stefano

doi:10.1103/physrevb.105.054415

Cited by 28 publications

(12 citation statements)

References 52 publications

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“…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%

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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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Section: Introductionmentioning

confidence: 99%

“…This stimulated further experimental research in this field. Thus, high-order nutation resonances, the dependence of nutation effects on magnetic anisotropy, and the ballistic switching of magnetization have been experimentally detected [ 5 , 6 ]. We note that only uniformly magnetized magnetic samples were considered before.…”

Section: Introductionmentioning

confidence: 99%

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

Gareeva

Guslienko

2023

Nanomaterials

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“…The ballistic switching is a promising candidate for high-speed switching, and much effort has been devoted to developing the ballistic switching both theoretically [1][2][3][4][5][6][7][8] and experimentally. [9][10][11][12][13][14][15][16] In ballistic switching a pulsed magnetic field is applied perpendicular to the easy axis to induce the large-angle precession around the external magnetic field axis. The duration of the pulse is set to a half of the precession period.…”

Section: Introductionmentioning

confidence: 99%

Material Parameters for Faster Ballistic Switching of an In-Plane Magnetized Nanomagnet

Yamaji¹,

Imamura²

2023

Preprint

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“…By using the intrinsic inertia of antiferromagnetic dynamics, it is possible to reduce switching times by a factor of 10 compared to ferromagnets [24]. The role of the extrinsic inertia as described by the ILLG equation for spin switching has hardly been studied so far, apart from a recent work by Neeraj et al [25] which focused on applying a magnetic field pulse without an oscillating component. They showed that the inertial term opens an additional energy channel slightly modifying the switching time.…”

Section: Introductionmentioning

confidence: 99%

Nutational switching in ferromagnets and antiferromagnets

et al. 2022

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It was demonstrated recently that on ultrashort timescales magnetization dynamics not only exhibits precession but also nutation. Here, we investigate how nutation can contribute to spin switching, leading towards ultrafast data writing. We use analytic theory and numerical spin simulations to discuss the behavior of ferromagnets and antiferromagnets in high-frequency magnetic fields. In ferromagnets, linearly polarized fields align the magnetization perpendicular to the external field, enabling 90 • switching. For circularly polarized fields in the xy plane, the magnetization tilts to the z direction. During this tilting it rotates around the z axis, allowing 180 • switching. In antiferromagnets, external fields with frequencies higher than the nutation frequency align the order parameter parallel to the field direction, while for lower frequencies it is oriented perpendicular to the field. The switching frequency increases with the magnetic field strength, and it deviates from the Larmor frequency, making it possible to outpace precessional switching in high magnetic fields.

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Magnetization switching in the inertial regime

Cited by 28 publications

References 52 publications

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

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

Material Parameters for Faster Ballistic Switching of an In-Plane Magnetized Nanomagnet

Nutational switching in ferromagnets and antiferromagnets

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