Multiple magnon modes in the Co3Sn2S2Weyl semimetal candidate

Shvetsov, O. O.; Esin, V. D.; Timonina, A. V.; Kolesnikov, N. N.; Deviatov, E. V.

doi:10.1209/0295-5075/127/57002

Cited by 21 publications

(30 citation statements)

References 38 publications

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“…Strong temperature dependence in Fig. 3 (a) is in a contrast with known bulk behavior [15][16][17][18][19][20][21][22] , which can also indicate the surface state origin of the observed peaks. (Color online) Schematic representation of Au-Ti2MnAl and Ni-WTe2 interfaces, which are characterized by Weyl surface states at the interface (blue color).…”

Section: (A) and (B)mentioning

confidence: 95%

“…However, evolution of the peaks' positions with magnetic field is unusual: the peaks are moving to lower currents in Figs. 4 and 5, which is opposite to the known bulk magnon behavior [15][16][17][18][19][20][21][22] . This peaks' evolution is the main difference of our results from the standard magnon experiments [15][16][17][18][19][20][21][22] .…”

Section: (A) and (B)mentioning

confidence: 97%

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Spin-dependent transport through a Weyl semimetal surface

et al. 2020

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We experimentally compare two types of interface structures with magnetic and non-magnetic Weyl semimetals. They are the junctions between a gold normal layer and magnetic Weyl semimetal Ti2MnAl, and a ferromagnetic nickel layer and non-magnetic Weyl semimetal WTe2, respectively. Due to the ferromagnetic side of the junction, we investigate spin-polarized transport through the Weyl semimetal surface. For both structures, we demonstrate similar current-voltage characteristics, with hysteresis at low currents and sharp peaks in differential resistance at high ones. Despite this behavior resembles the known current-induced magnetization dynamics in ferromagnetic structures, evolution of the resistance peaks with magnetic field is unusual. We connect the observed effects with current-induced spin dynamics in Weyl topological surface states.

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Section: (A) and (B)mentioning

confidence: 95%

Section: (A) and (B)mentioning

confidence: 97%

Spin-dependent transport through a Weyl semimetal surface

et al. 2020

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“…[78,188,189] Interplay between electrons and magnons in realistic Weyl semimetals needs to be questioned in future studies. [190]…”

Section: Resultsmentioning

confidence: 99%

Magnetic Textures and Dynamics in Magnetic Weyl Semimetals

Araki

2019

Annalen der Physik

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Recent theoretical and experimental attempts have been successful in finding magnetic Weyl semimetal phases, which show nodal‐point structure in the electronic bands as well as magnetic orders. Beyond uniform ferromagnetic or antiferromagnetic orders, nonuniform magnetic textures, such as domain walls and skyrmions, enrich the properties of the Weyl electrons even more in such materials. Here, a topical review on interplay between Weyl electrons and magnetic textures in those magnetic Weyl semimetals is given. The basics of magnetic textures in nontopological magnetic metals are reviewed first, and then the effect of magnetic textures in Weyl semimetals is discussed, regarding the recent theoretical and experimental progress therein. The idea of the fictitious “axial gauge fields” is pointed out, which effectively describes the effect of magnetic textures on the Weyl electrons and can well account for the properties of the electrons localized around magnetic domain walls.

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“…Spin valve resistance is defined by the relative angle between magnetizations of the layers due to the spin-dependent scattering, which can be tuned by field or flowing current. Spin valve can be naturally realized in different types of topological materials and their heterostuctures with ferromagnets [17][18][19][20] . In this case, spin-polarized topological surface state acts as one layer of a spin valve, while the role of the other is played by the ferromagnetic lead or by the ferromagnetic sample's bulk 17,19 .…”

Section: Discussionmentioning

confidence: 99%

“…they can be regarded as natural realization of spin-valves. In this case, spin-polarized Fermi arcs and ferromagnetic bulk represent thin (free) and thick (reference) layers, respectively [17][18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

Josephson spin-valve realization in the magnetic nodal-line topological semimetal Fe$_3$GeTe$_2$

Shvetsov,

Barash,

Timonina

et al. 2021

Preprint

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Three-dimensional van der Waals ferromagnet Fe3GeTe2 (FGT) is regarded as a candidate for the magnetic topological nodal line semimetal. We investigate lateral electron transport between two 3 µm spaced superconducting In leads beneath a thick three-dimensional FGT exfoliated flake. At low 30 mK temperature, we observe Josephson supercurrent that exhibits unusual critical current Ic suppression by the magnetic field B. The overall Ic(B) pattern is asymmetric in respect to the B sign. We demonstrate, that the asymmetry is defined by the magnetic field sweep direction, so the Ic(B) pattern is strictly reversed (as B to −B inversion) for the opposite sweeps. We also observe an interplay between maximum and minimum in Ic(B) in normal magnetic fields, while there are fast aperiodic Ic(B) fluctuations for the in-plane ones. These effects can not be expected for homogeneous superconductor-ferromagnet-superconductor junctions, while they are known for Josephson spin valves. The mostly possible scenario for Josephson spin valve realization in FGT is the misalignment of spin polarizations of the Fermi arc surface states and ferromagnetic FGT bulk, but we also discuss possible influence of spin-dependent transport between magnetic domains.

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Multiple magnon modes in the Co₃Sn₂S₂Weyl semimetal candidate

Cited by 21 publications

References 38 publications

Spin-dependent transport through a Weyl semimetal surface

Spin-dependent transport through a Weyl semimetal surface

Magnetic Textures and Dynamics in Magnetic Weyl Semimetals

Josephson spin-valve realization in the magnetic nodal-line topological semimetal Fe$_3$GeTe$_2$

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