Weak localization and small anomalous Hall conductivity in ferromagnetic Weyl semimetal Co2TiGe

Dulal, Rajendra; Dahal, Bishnu; Forbes, Andrew; Bhattarai, Niraj; Pegg, Ian L.; Philip, John

doi:10.1038/s41598-019-39037-0

Cited by 30 publications

(24 citation statements)

References 48 publications

(61 reference statements)

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“…Furthermore, optimization of the parameters for imprinting nearly isothermal and stable states, such as the superconducting critical state, imposes different constraints than those needed for imprinting magnetic flux avalanches in superconductors which can substantially heat the material locally and propagate at speeds exceeding those of magnetic domains [85]. Although in the present review we have focused our attention to the achievements obtained using conventional ferromagnetic as recording layer, alternative materials like half-metallic ferromagnets [86], magnetic topological insulators [87], and ferromagnetic Weyl semimetals [88] might provide fertile ground for the development of the next-generation of magnetic recording of the superconducting states. Clearly, further theoretical and experimental efforts are needed to permit this emerging technique to advance from the current proof-of-concept stage to a mature level.…”

Section: Discussionmentioning

confidence: 99%

Magnetic Recording of Superconducting States

Shaw

Alvarez

Brisbois

et al. 2019

Metals

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Local polarization of magnetic materials has become a well-known and widely used method for storing binary information. Numerous applications in our daily life such as credit cards, computer hard drives, and the popular magnetic drawing board toy, rely on this principle. In this work, we review the recent advances on the magnetic recording of inhomogeneous magnetic landscapes produced by superconducting films. We summarize the current compelling experimental evidence showing that magnetic recording can be applied for imprinting in a soft magnetic layer the flux trajectory taking place in a superconducting layer at cryogenic temperatures. This approach enables the ex situ observation at room temperature of the imprinted magnetic flux landscape obtained below the critical temperature of the superconducting state. The undeniable appeal of the proposed technique lies in its simplicity and the potential to improve the spatial resolution, possibly down to the scale of a few vortices.

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Section: Discussionmentioning

confidence: 99%

Magnetic Recording of Superconducting States

Shaw

Alvarez

Brisbois

et al. 2019

Metals

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“…This can lead to a larger extrinsic contribution to the AHE due to enhanced scattering at the surfaces. Depending on the sign of the extrinsic part with respect to the intrinsic one, this can either enhance or decrease the intrinsic AHE [27,71,72]. For very thin films, it can even be possible that the confinement to leads a changed band structure where the Weyl points are annihilated and an inverted band gap is created [73][74][75], leading to a 2D QAHE system.…”

Section: Anomalous Hall Effect In Thin Filmsmentioning

confidence: 99%

Linear Response in Topological Materials

Noky

Sun

2019

Applied Sciences

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The discovery of topological insulators and semimetals has opened up a new perspective to understand materials. Owing to the special band structure and enlarged Berry curvature, the linear responses are strongly enhanced in topological materials. The interplay of topological band structure and symmetries plays a crucial role for designing new materials with strong and exotic new electromagnetic responses and provides promising mechanisms and new materials for the next generation of technological applications. We review the fundamental concept of linear responses in topological materials from the symmetry point of view and discuss their potential applications. * ysun@cpfs.mpg.de 1 arXiv:2005.11834v1 [cond-mat.mtrl-sci] 24 May 2020

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“…For example, it has been shown that a Fe3Sn2 [17] material supports bulk massive Dirac fermions in the presence of ferromagnetic order or a half-metallic ferromagnetic material (e.g., Co3Sn2S2 [18]) with magnetic Weyl fermions. In addition, a small amount of AHE conductivity has been measured in Co2TiGe thin films [19] and in recently discovered topological magnetism in the predicted magnetic Weyl semimetal CeAlGe [20].…”

Section: Introductionmentioning

confidence: 99%

Magneto-Optical Tools to Study Effects in Dirac and Weyl Semimetals

Cheskis

2020

Symmetry

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Research regarding topological Dirac and Weyl semimetals contributes to our understanding not only of the field of solid-state physics, but also the field of high-energy physics as the physics of Dirac and Weyl semimetals resembles the physics of Dirac and Weyl massless fermions. In condensed matter physics, the Weyl nodes are detached in momentum space and may be realized as emergent quasiparticles with a distinct chirality, left-handed or right-handed. These states lead to phenomena like the chiral anomaly and the anomalous Hall effect (AHE). Furthermore, the combination of quantum effects and magnetic effects in magnetic Weyl semimetals is very intriguing. Magneto-optical tools, which are usually used to study magnetic phenomena, also contribute to magnetic Weyl semimetals. Moreover, with the magneto-optical technique, it is possible to follow the dynamics of the processes and to study the lifetime of the Weyl states. In this work, we review and discuss the effects of using magneto-optical tools for studying quantum effects like the chiral anomaly or magnetic effects in magnetic Weyl and Dirac systems using the magneto-optical Kerr effect (MOKE) or Faraday systems including a single detection and imaging. Examples of using magneto-optical systems in the research of ultrafast magnetic dynamics of thin polycrystalline nickel and permaloy are reviewed as are the magnetic spatial dynamics by employing magneto-optical Kerr or Faraday microscopy tools with ferromagnetic thin films. Interestingly, the excitation of a circularly polarized femtosecond laser pulse could lead to the breakage of time-reversal symmetry and to the transformation of the Dirac state to the Floquet–Weyl semimetal state. The development of a suitable ultrafast magneto-optical system for Weyl systems is discussed, and the practical difficulties for the realization of such a system are considered.

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Weak localization and small anomalous Hall conductivity in ferromagnetic Weyl semimetal Co2TiGe

Cited by 30 publications

References 48 publications

Magnetic Recording of Superconducting States

Magnetic Recording of Superconducting States

Linear Response in Topological Materials

Magneto-Optical Tools to Study Effects in Dirac and Weyl Semimetals

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