Magnetic Textures and Dynamics in Magnetic Weyl Semimetals

Araki, Yasufumi

doi:10.1002/andp.201900287

Cited by 58 publications

(38 citation statements)

References 218 publications

(503 reference statements)

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“…Since the peaks disappear simultaneously with dV /dI switchings in Fig. 3 (a) the magnon excitation with spin textures 30,31 in the topological surface states. In general, the dV /dI peak position I sw is described by Slonczewski model 18,39 .…”

Section: (A) and (B)mentioning

confidence: 90%

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: 90%

Spin-dependent transport through a Weyl semimetal surface

et al. 2020

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“…We performed two-band [1,22,23] analyses on all measured samples. The carrier concentration of holes and electrons are both~1×10 20 cm −3 in all studied samples (details in Supporting Information Note 4), indicating a near compensation of carriers in Co 3 Sn 2 S 2 single-crystalline nanoflakes with the abovementioned different thicknesses. The abovementioned results reveal the consistent carrier properties of Co 3 Sn 2 S 2 single-crystalline nanoflake and bulk samples [1,14,15].…”

Section: Resultsmentioning

confidence: 80%

“…Furthermore, an exceptional Hall component besides the normal and anomalous Hall effects is observed concurrently. Possible magnetic textures induced by an antiparallel magnetic field are possibly responsible for the anomalous transport behaviors, as the interaction between Weyl electrons and magnetic textures can result in local states and conductive modes [16][17][18][19][20]. This study will attract interest in the interplay of magnetic order and topological transport behavior and offer a platform for magnetic topological material-based applications.…”

Section: Introductionmentioning

confidence: 90%

On the anomalous low-resistance state and exceptional Hall component in hard-magnetic Weyl nanoflakes

Zeng

Shi

et al. 2021

Sci. China Phys. Mech. Astron.

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Magnetic topological materials, which combine magnetism and topology, are expected to host emerging topological states and exotic quantum phenomena. In this study, with the aid of greatly enhanced coercive fields in high-quality nanoflakes of the magnetic Weyl semimetal Co 3 Sn 2 S 2 , we investigate anomalous electronic transport properties that are difficult to reveal in bulk Co 3 Sn 2 S 2 or other magnetic materials. When the magnetization is antiparallel to the applied magnetic field, the low longitudinal resistance state occurs, which is in sharp contrast to the high resistance state for the parallel case. Meanwhile, an exceptional Hall component that can be up to three times larger than conventional anomalous Hall resistivity is also observed for transverse transport. These anomalous transport behaviors can be further understood by considering nonlinear magnetic textures and the chiral magnetic field associated with Weyl fermions, extending the longitudinal and transverse transport physics and providing novel degrees of freedom in the spintronic applications of emerging topological magnets.

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“…To move the domain wall along the x-axis a magnetic field must have a component along the easy axis, the z-direction, as only this component couples to X (t) in Eq. (32). For simplicity we therefore choose the magnetic field to be B = Bẑ.…”

Section: Maximum Domain Wall Velocitymentioning

confidence: 99%

Electric manipulation of domain walls in magnetic Weyl semimetals via the axial anomaly

et al. 2021

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We show how the axial (chiral) anomaly induces a spin torque on the magnetization in magnetic Weyl semimetals. The anomaly produces an imbalance in left- and right-handed chirality carriers when non-orthogonal electric and magnetic fields are applied. Such imbalance generates a spin density which exerts a torque on the magnetization, the strength of which can be controlled by the intensity of the applied electric field. We show how this results in an electric control of the chirality of domain walls, as well as in an improvement of the domain wall dynamics, by delaying the onset of the Walker breakdown. The measurement of the electric field mediated changes in the domain wall chirality would constitute a direct proof of the axial anomaly. Additionally, we show how quantum fluctuations of electronic Fermi arc states bound to the domain wall naturally induce an effective magnetic anisotropy, allowing for high domain wall velocities even if the intrinsic anisotropy of the magnetic Weyl semimetal is small.

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Magnetic Textures and Dynamics in Magnetic Weyl Semimetals

Cited by 58 publications

References 218 publications

Spin-dependent transport through a Weyl semimetal surface

Spin-dependent transport through a Weyl semimetal surface

On the anomalous low-resistance state and exceptional Hall component in hard-magnetic Weyl nanoflakes

Electric manipulation of domain walls in magnetic Weyl semimetals via the axial anomaly

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