Slowdown of photoexcited spin dynamics in the non-collinear spin-ordered phases in skyrmion host GaV4S8

Sekiguchi, Fumiya; Budzinauskas, Kestutis; Padmanabhan, Prashant; Versteeg, R. B.; Tsurkan, V.; Kézsmárki, I.; Foggetti, Francesco; Artyukhin, Sergey; Loosdrecht, P.H.M. van

doi:10.1038/s41467-022-30829-z

Cited by 6 publications

(7 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For some of these systems, switchability of the polarization was demonstrated, making them JT effect-driven ferroelectrics [10,11,12,22]. Moreover, at low temperatures they exhibit various magnetic orderings, including Néel-type skyrmion lattice states [10,11,[24][25][26][27][28][29][30], thus becoming multiferroic with significant magnetoelectric effects.…”

Section: Introductionmentioning

confidence: 99%

Antipolar transitions in GaNb4Se8 and GaTa4Se8

et al. 2022

View full text Add to dashboard Cite

We present dielectric, polarization, resistivity, specific-heat, and magnetic susceptibility data on single crystals of the lacunar spinels GaNb 4 Se 8 and GaTa 4 Se 8 , tetrahedral cluster-based materials with substantial spin-orbit coupling. We concentrate on the possible occurrence of antipolar order in these compounds, as previously reported for the isoelectronic GaNb 4 S 8 , where spin-orbit coupling plays a less important role. Our broadband dielectric-spectroscopy investigations reveal clear anomalies of the intrinsic dielectric constant at the magnetostructural transitions in both systems that are in accord with the expectations for antipolar transitions. A similar anomaly is also observed at the cubic-cubic transition of the Nb compound leading to an intermediate phase. Similar to other polar and antipolar lacunar spinels, we find indications for dipolar relaxation dynamics at low temperatures. Polarization measurements on GaNb 4 Se 8 reveal weak ferroelectric ordering below the magnetostructural transition, either superimposed to antipolar order or emerging at structural domain walls. The temperature-dependent dc resistivity evidences essentially thermally activated charge transport with different activation energies in the different phases. A huge steplike increase of the resistivity at the magnetostructural transition of the Ta compound points to a fundamental change in the electronic structure or the mechanism of the charge transport. At low temperatures, charge transport is governed by in-gap impurity states, as also invoked to explain the resistive switching in these compounds.

show abstract

Section: Introductionmentioning

confidence: 99%

Antipolar transitions in GaNb4Se8 and GaTa4Se8

et al. 2022

View full text Add to dashboard Cite

show abstract

“…[165,168] These GHz-range spin modes of skyrmions can help to explain some intriguing phenomena such as the relationship between the skyrmion Hall angle and the current density [163] and are also the basis for skyrmion devices in need of dynamically manipulating magnetic orders. [169] Sophisticated microwave absorption experiments carried out in the insulating chiral magnet Cu 2 OSeO 3 have identified spin excitations of skyrmions with eigenfrequencies in the microwave regime. [165,170] The real-space tracking of the skyrmion motion in a magnetic disk induced by a magnetic field gradient via pump-probe X-ray F I G U R E 9 (A) Current-driven motion of a skyrmion bundle (N = 18) in a FeGe thin plate at a current density of  j 4.0 × 10 10 A m −2 and the dependence of the position on the pulse number, the average velocities on the current density and the skyrmion Hall angle on the current density.…”

Section: Microwave and Laser-induced Spin Excitations Of Skyrmionsmentioning

confidence: 99%

“…[171] This can be attributed to the laser-induced quench of the magnetocrystalline anisotropy and the efficiency of such kind of optical excitation is enhanced in the skyrmion phase. [169] The specific frequencies of the skyrmion excitations, distinct from that in other phases, provide a fingerprint of the skyrmion phase state in their hosting materials. [167,169,171] 5 | NUCLEATION OF SKYRMIONS FOR FUTURE APPLICATIONS…”

Section: Microwave and Laser-induced Spin Excitations Of Skyrmionsmentioning

confidence: 99%

“…[169] The specific frequencies of the skyrmion excitations, distinct from that in other phases, provide a fingerprint of the skyrmion phase state in their hosting materials. [167,169,171] 5 | NUCLEATION OF SKYRMIONS FOR FUTURE APPLICATIONS…”

Section: Microwave and Laser-induced Spin Excitations Of Skyrmionsmentioning

confidence: 99%

“…[166] In addition, ultrafast optical pump-probe techniques serve as powerful tools for driving and detecting highfrequency dynamics of skyrmions. [167,169,171] In general, optical pump laser pulses manipulate magnetic order via thermal effects, the energy transferring initially from photons to electrons and then to spins through subsequent electron-phonon and spin-lattice interactions, or via nonthermal effects, the direct coupling between photons and spins through optomagnetic and photomagnetic processes, which strongly depend on the polarization state of the excitation light. [172] Probe pulses at finite time intervals with respect to the pump light can dynamically measure the transient spin orientation through magnetooptical Faraday or Kerr effects.…”

Section: Microwave and Laser-induced Spin Excitations Of Skyrmionsmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic skyrmions: Basic properties and potential applications

Wang

2023

Interdisciplinary Materials

View full text Add to dashboard Cite

Magnetic skyrmions are particle‐like topological magnetic textures that are potential information carriers in future spintronics. An enormous body of research confirms their existence in a broad range of magnetic materials since their first discovery in 2009. To date, magnetic skyrmions can not only be found in asymmetric systems but also in centrosymmetric ones. Notably, engineered magnetic multilayers are promising structures for skyrmion‐based spintronics because they can stabilize small‐sized skyrmions at room temperature and facilitate their electric manipulation. In this overview, we introduce the topological nature, their special properties, and nucleation methods of skyrmions, and show their potential for applications. Perspectives on skyrmionic devices and developments toward other, more three‐dimensional particle‐like magnetic nanostructures, are discussed at the end.

show abstract

Laser‐Induced Real‐Space Topology Control of Spin Wave Resonances

Titze,

Koraltan,

Schmidt

et al. 2024

Adv Funct Materials

View full text Add to dashboard Cite

Femtosecond laser excitation of materials exhibiting magnetic spin textures promises advanced magnetic control via the generation of non‐equilibrium spin dynamics. Ferrimagnetic [Fe(0.35 nm)/Gd(0.40 nm)]160 multilayers are used to explore this approach, as they host a rich diversity of magnetic textures from stripe domains at low magnetic fields, a dense bubble/skyrmion lattice at intermediate fields, and a single domain state for high magnetic fields. Using femtosecond magneto‐optics, distinct coherent spin wave dynamics are observed in this material in response to a weak laser excitation, enabling an unambiguous identification of the different magnetic spin textures. Moreover, employing strong laser excitation, versatile control of the coherent spin dynamics via non‐equilibrium transformation of magnetic spin textures becomes possible by both creating and annihilating bubbles/skyrmions. Micromagnetic simulations and Lorentz transmission electron microscopy with in situ optical excitation corroborate these findings.

show abstract

Slowdown of photoexcited spin dynamics in the non-collinear spin-ordered phases in skyrmion host GaV4S8

Cited by 6 publications

References 60 publications

Antipolar transitions in GaNb4Se8 and GaTa4Se8

Antipolar transitions in GaNb4Se8 and GaTa4Se8

Magnetic skyrmions: Basic properties and potential applications

Laser‐Induced Real‐Space Topology Control of Spin Wave Resonances

Contact Info

Product

Resources

About