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 Effects of surface and interface scattering on anomalous Hall effect in Co/Pd multilayers

2012 ◽  
Vol 86 (10) ◽  
Author(s):  
Z. B. Guo ◽  
W. B. Mi ◽  
R. O. Aboljadayel ◽  
B. Zhang ◽  
Q. Zhang ◽  
...  
Keyword(s):  
Hall Effect ◽  
Anomalous Hall Effect ◽  
Surface And Interface ◽  
Interface Scattering

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.

scholarly journals Interface-induced sign reversal of the anomalous Hall effect in magnetic topological insulator heterostructures

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Fei Wang ◽  
Xuepeng Wang ◽  
Yi-Fan Zhao ◽  
Di Xiao ◽  
Ling-Jie Zhou ◽  
...  
Keyword(s):  
Hall Effect ◽  
Electric Fields ◽  
First Principles ◽  
Berry Phase ◽  
Condensed Matter ◽  
Anomalous Hall Effect ◽  
First Principles Calculations ◽  
Sign Reversal ◽  
Berry Curvature ◽  
Topological Materials

AbstractThe Berry phase picture provides important insights into the electronic properties of condensed matter systems. The intrinsic anomalous Hall (AH) effect can be understood as the consequence of non-zero Berry curvature in momentum space. Here, we fabricate TI/magnetic TI heterostructures and find that the sign of the AH effect in the magnetic TI layer can be changed from being positive to negative with increasing the thickness of the top TI layer. Our first-principles calculations show that the built-in electric fields at the TI/magnetic TI interface influence the band structure of the magnetic TI layer, and thus lead to a reconstruction of the Berry curvature in the heterostructure samples. Based on the interface-induced AH effect with a negative sign in TI/V-doped TI bilayer structures, we create an artificial “topological Hall effect”-like feature in the Hall trace of the V-doped TI/TI/Cr-doped TI sandwich heterostructures. Our study provides a new route to create the Berry curvature change in magnetic topological materials that may lead to potential technological applications.

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

Extraordinary Hall effect in giant magnetoresistive Fe/Cr multilayers: The role of interface scattering

1996 ◽  
Vol 53 (18) ◽  
pp. R11938-R11941 ◽  
Author(s):  
V. Korenivski ◽  
K. V. Rao ◽  
J. Colino ◽  
Ivan K. Schuller
Keyword(s):  
Hall Effect ◽  
Extraordinary Hall Effect ◽  
Interface Scattering
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