scholarly journals Magneto-optical spectroscopy on Weyl nodes for anomalous and topological Hall effects in chiral MnGe

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Y. Hayashi ◽  
Y. Okamura ◽  
N. Kanazawa ◽  
T. Yu ◽  
T. Koretsune ◽  
...  
Keyword(s):  
Hall Effect ◽  
Optical Spectroscopy ◽  
Anomalous Hall Effect ◽  
Hall Conductivity ◽  
Magnetic Systems ◽  
Spin Structures ◽  
Optical Responses ◽  
Electronic Spin ◽  
Hall Effects

AbstractPhysics of Weyl electrons has been attracting considerable interests and further accelerated by recent discoveries of giant anomalous Hall effect (AHE) and topological Hall effect (THE) in several magnetic systems including non-coplanar magnets with spin chirality or small-size skyrmions. These AHEs/THEs are often attributed to the intense Berry curvature generated around the Weyl nodes accompanied by band anti-crossings, yet the direct experimental evidence still remains elusive. Here, we demonstrate an essential role of the band anti-crossing for the giant AHE and THE in MnGe thin film by using the terahertz magneto-optical spectroscopy. The low-energy resonance structures around ~ 1.2 meV in the optical Hall conductivity show the enhanced AHE and THE, indicating the emergence of at least two distinct anti-crossings near the Fermi level. The theoretical analysis demonstrates that the competition of these resonances with opposite signs is a cause of the strong temperature and magnetic-field dependences of observed DC Hall conductivity. These results lead to the comprehensive understanding of the interplay among the transport phenomena, optical responses and electronic/spin structures.

Sign reversal of anomalous Hall effect derived from the transformation of scattering effect in cluster-assembled Ni0.8Fe0.2 nanostructural films

Nanoscale ◽  
2021 ◽  
Author(s):  
Ning Jiang ◽  
Bo Yang ◽  
Yulong Bai ◽  
Yaoxiang Jiang ◽  
Shifeng Zhao
Keyword(s):  
Hall Effect ◽  
Anomalous Hall Effect ◽  
Sign Reversal ◽  
Surface And Interface ◽  
Scattering Effect ◽  
Single Substance ◽  
Interface Scattering ◽  
Hall Effects

Both surface and interface scattering induced a sign reversal of anomalous Hall effects (AHE) in a few heterostructures. The sign reversal exiting in a single-substance can clarify the role of...

scholarly journals Anomalous spin Hall and inverse spin Hall effects in magnetic systems

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
X. R. Wang
Keyword(s):  
Hall Effect ◽  
Order Parameter ◽  
Spin Current ◽  
Spin Hall Effect ◽  
Magnetic Systems ◽  
Charge Current ◽  
Spin Currents ◽  
Tensor Quantity ◽  
Hall Effects ◽  
Spin Hall Effects

AbstractSpin current is a very important tensor quantity in spintronics. However, the well-known spin-Hall effect (SHE) can only generate a few of its components whose propagating and polarization directions are perpendicular with each other and to an applied charge current. It is highly desirable in applications to generate spin currents whose polarization can be in any possible direction. Here anomalous SHE and inverse spin-Hall effect (ISHE) in magnetic systems are predicted. Spin currents, whose polarisation and propagation are collinear or orthogonal with each other and along or perpendicular to the charge current, can be generated, depending on whether the applied charge current is along or perpendicular to the order parameter. In anomalous ISHEs, charge currents proportional to the order parameter can be along or perpendicular to the propagating or polarization directions of the spin current.

scholarly journals Role of Spin-Flip Transitions in the Anomalous Hall Effect of FePt Alloy

2011 ◽  
Vol 106 (11) ◽  
Author(s):  
Hongbin Zhang ◽  
Frank Freimuth ◽  
Stefan Blügel ◽  
Yuriy Mokrousov ◽  
Ivo Souza
Keyword(s):  
Hall Effect ◽  
Anomalous Hall Effect ◽  
Fept Alloy ◽  
Spin Flip

scholarly journals Anomalous Hall effect and the role of Berry curvature in Co2TiSn Heusler films

2019 ◽  
Vol 100 (5) ◽  
Author(s):  
Benedikt Ernst ◽  
Roshnee Sahoo ◽  
Yan Sun ◽  
Jayita Nayak ◽  
Lukas Müchler ◽  
...  
Keyword(s):  
Hall Effect ◽  
Anomalous Hall Effect ◽  
Berry Curvature

scholarly journals Scaling of anomalous Hall effects in facing-target reactively sputtered Fe4N films

2015 ◽  
Vol 17 (23) ◽  
pp. 15435-15441 ◽  
Author(s):  
Y. Zhang ◽  
W. B. Mi ◽  
X. C. Wang ◽  
X. X. Zhang
Keyword(s):  
Hall Effect ◽  
Anomalous Hall Effect ◽  
Hall Effects ◽  
First Time

The scaling of the anomalous Hall effect in γ′-Fe4N films is investigated systematically for the first time.

Spin-injection Hall effect

2017 ◽  
Author(s):  
J. Wunderlich ◽  
K. Olejník ◽  
L. P. Zârbo ◽  
V. P. Amin ◽  
J. Sinova ◽  
...  
Keyword(s):  
Hall Effect ◽  
Spin Injection ◽  
Anomalous Hall Effect ◽  
Relative Strength ◽  
Spin Hall Effect ◽  
Quasi Particle ◽  
Hall Effects ◽  
Spin Polarized ◽  
Inverse Spin Hall Effect ◽  
Current Flows

This chapter discusses the Spin-injection Hall effect (SiHE), another member of the spin-dependent Hall effects that is closely related to the anomalous Hall effect (AHE), the spin Hall effect (SHE), and the inverse spin Hall effect (iSHE). The microscopic origins responsible for the appearance of spin-dependent Hall effects are due to the spin-orbit (SO) coupling-related asymmetrical deflections of spin carriers. Depending on the relative strength of the SO coupling compared to the energy-level broadening of the quasi-particle states due to disorder scattering, scattering-related extrinsic mechanisms or intrinsic band structure-related deflection dominate the spin-dependent Hall response. Both the iSHE and the SiHE require spin injection into a nonmagnetic system. Similar to the AHE, a spin-polarized charge current flows in the case of the SiHE and the SO coupling generates the spin-dependent Hall signal.

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