Localized charge in various configurations of magnetic domain wall in a Weyl semimetal

Araki, Yasufumi; Yoshida, A.; Nomura, Kentaro

doi:10.1103/physrevb.98.045302

Cited by 16 publications

(18 citation statements)

References 54 publications

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“…In past work, a localized charge at the domain wall in magnetic Weyl semimetals has been theoretically proposed 28,29 . The origin of the localized charge is understood as the enhanced density of states by Landau-level degeneracy owing to the axial magnetic field.…”

Section: Resultsmentioning

confidence: 99%

“…It was proposed that magnetic textures in Weyl semimetals retain a localized electric charge 28,29 , and that more efficient electrical manipulation of the magnetic texture is possible in Weyl semimetals than in conventional ferromagnetic metals owing to the strong correlation between magnetic texture and charge degrees of freedom. The dynamics of magnetic textures are driven by electrically-induced spin torques which consist of adiabatic and non-adiabatic spin-transfer torques in conventional ferromagnetic metals.…”

Section: Introductionmentioning

confidence: 99%

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Theory for spin torque in Weyl semimetal with magnetic texture

Kurebayashi

Nomura

2019

Sci Rep

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The spin-transfer torque is a fundamental physical quantity to operate the spintronics devices such as racetrack memory. We theoretically study the spin-transfer torque and analyze the dynamics of the magnetic domain walls in magnetic Weyl semimetals. Owing to the strong spin-orbit coupling in Weyl semimetals, the spin-transfer torque can be significantly enhanced, because of which they can provide a more efficient means of controlling magnetic textures. We derive the analytical expression of the spin-transfer torque and find that the velocity of the domain wall is one order of magnitude greater than that of conventional ferromagnetic metals. Furthermore, due to the suppression of longitudinal conductivity in the thin domain-wall configuration, the dissipation due to Joule heating for the spin-transfer torque becomes much smaller than that in bulk metallic ferromagnets. Consequently, the fast-control of the domain wall can be achieved with smaller dissipation from Joule heating in the Weyl semimetals as required for application to low-energy-consumption spintronics devices.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theory for spin torque in Weyl semimetal with magnetic texture

Kurebayashi

Nomura

2019

Sci Rep

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“…In particular, even in the absence of the realistic magnetic field B , the axial magnetic flux B 5 ( r ) from a magnetic texture leads to the localized charge, with its density

\begin{matrix} true \\ right ρ_{B} (r) = - \frac{e^{2}}{2 π^{2}} \frac{μ}{v_{normalF}} | {bold-italicB}_{5} false(bold-italicr false) | \end{matrix}

at the magnetic texture . This localized charge is explicitly derived under a 1D domain wall in terms of the Fermi arc modes localized at the boundary; see Section for details. Although the spatially localized charge in metallic regime is inevitably screened once we consider the Coulomb interaction, the screening effect is smaller than that in normal metals, since the density of states in topological semimetals becomes small around the band crossing points…”

Section: Weyl Semimetal and Magnetic Texturesmentioning

confidence: 99%

“…Therefore, although the Weyl electrons cannot be transmitted through a sharp magnetic texture, as the valleys are shifted in momentum space in accordance with the magnetization, this spin torque is still present and drives a motion of the magnetic texture. This effect can also be regarded macroscopically as the electric driving of the localized charge

ρ_{B}

shown above attached to the magnetic texture …”

Section: Weyl Semimetal and Magnetic Texturesmentioning

confidence: 99%

“…This effect can also be regarded macroscopically as the electric driving of the localized charge B shown above attached to the magnetic texture. [130,131] In magnetic Weyl semimetals, it is also proposed that an external magnetic field B under a gate voltage induces a spin torque, which is termed charge (voltage)-induced spin torque. [158,159] This effect can be described in terms of the chiral magnetic effect: when the Fermi level is lifted by due to the gate voltage, the magnetic field B induces the axial current…”

Section: Field-induced Dynamics Of Magnetic Texturesmentioning

confidence: 99%

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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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Picoscale Magnetoelasticity Governs Heterogeneous Magnetic Domains in a Noncentrosymmetric Ferromagnetic Weyl Semimetal

Franklin

Jayakody

et al. 2021

Adv Quantum Tech

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Magnetic Weyl semimetals are predicted to host emergent electromagnetic fields at heterogeneous strained phases or at the magnetic domain walls. Tunability and control of the topological and magnetic properties are crucial for revealing these phenomena, which are not well understood or fully realized yet. Here, a scanning superconducting quantum interference device microscope is used to image spontaneous magnetization and magnetic susceptibility of CeAlSi, a noncentrosymmetric ferromagnetic Weyl semimetal candidate. Large metastable domains are observed alongside stable ferromagnetic domains. The metastable domains most likely embody a type of frustrated or glassy magnetic phase, with excitations that may be of an emergent and exotic nature. Evidence is found that the heterogeneity of the two types of domains arises from magnetoelastic or magnetostriction effects. It is shown how these domains form, how they interact, and how they can be manipulated or stabilized with lattice strains estimated to be on picometer levels. This knowledge can be used in designing and fabricating devices made from CeAlSi and related materials for magnetic field sensing and magnetic memory applications.

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Localized charge in various configurations of magnetic domain wall in a Weyl semimetal

Cited by 16 publications

References 54 publications

Theory for spin torque in Weyl semimetal with magnetic texture

Theory for spin torque in Weyl semimetal with magnetic texture

Magnetic Textures and Dynamics in Magnetic Weyl Semimetals

Picoscale Magnetoelasticity Governs Heterogeneous Magnetic Domains in a Noncentrosymmetric Ferromagnetic Weyl Semimetal

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