scholarly journals Giant intrinsic spin Hall effect in W3Ta and other A15 superconductors

2019 ◽  
Vol 5 (4) ◽  
pp. eaav8575 ◽  
Author(s):  
E. Derunova ◽  
Y. Sun ◽  
C. Felser ◽  
S. S. P. Parkin ◽  
B. Yan ◽  
...  
Keyword(s):  
Hall Effect ◽  
Spin Current ◽  
Spin Hall Effect ◽  
High Symmetry ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Berry Curvature ◽  
Heavy Atoms ◽  
Simple Strategy ◽  
Nonmagnetic Metals

The spin Hall effect (SHE) is the conversion of charge current to spin current, and nonmagnetic metals with large SHEs are extremely sought after for spintronic applications, but their rarity has stifled widespread use. Here, we predict and explain the large intrinsic SHE in β-W and the A15 family of superconductors: W3Ta, Ta3Sb, and Cr3Ir having spin Hall conductivities (SHCs) of −2250, −1400, and 1210 ℏe(S/cm), respectively. Combining concepts from topological physics with the dependence of the SHE on the spin Berry curvature (SBC) of the electronic bands, we propose a simple strategy to rapidly search for materials with large intrinsic SHEs based on the following ideas: High symmetry combined with heavy atoms gives rise to multiple Dirac-like crossings in the electronic structure; without sufficient symmetry protection, these crossings gap due to spin-orbit coupling; and gapped crossings create large SBC.

scholarly journals Spin current generation in organic antiferromagnets

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Makoto Naka ◽  
Satoru Hayami ◽  
Hiroaki Kusunose ◽  
Yuki Yanagi ◽  
Yukitoshi Motome ◽  
...  
Keyword(s):  
Hall Effect ◽  
Spin Current ◽  
Inorganic Materials ◽  
Spin Hall Effect ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Current Generation ◽  
Heavy Atoms ◽  
A Charge

Abstract Spin current–a flow of electron spins without a charge current–is an ideal information carrier free from Joule heating for electronic devices. The celebrated spin Hall effect, which arises from the relativistic spin-orbit coupling, enables us to generate and detect spin currents in inorganic materials and semiconductors, taking advantage of their constituent heavy atoms. In contrast, organic materials consisting of molecules with light elements have been believed to be unsuited for spin current generation. Here we show that a class of organic antiferromagnets with checker-plate type molecular arrangements can serve as a spin current generator by applying a thermal gradient or an electric field, even with vanishing spin-orbit coupling. Our findings provide another route to create a spin current distinct from the conventional spin Hall effect and open a new field of spintronics based on organic magnets having advantages of small spin scattering and long lifetime.

scholarly journals Inverse spin Hall effect from pulsed spin current in organic semiconductors with tunable spin–orbit coupling

2016 ◽  
Vol 15 (8) ◽  
pp. 863-869 ◽  
Author(s):  
Dali Sun ◽  
Kipp J. van Schooten ◽  
Marzieh Kavand ◽  
Hans Malissa ◽  
Chuang Zhang ◽  
...  
Keyword(s):  
Hall Effect ◽  
Organic Semiconductors ◽  
Spin Current ◽  
Spin Hall Effect ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Inverse Spin Hall Effect

Spin Hall effect in the monolayer Janus compound MoSSe enhanced by Rashba spin-orbit coupling

2021 ◽  
Vol 104 (7) ◽  
Author(s):  
Sheng-Bin Yu ◽  
Ma Zhou ◽  
Dong Zhang ◽  
Kai Chang
Keyword(s):  
Hall Effect ◽  
Spin Hall Effect ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Rashba Spin

scholarly journals Orbital torque in magnetic bilayers

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Dongjoon Lee ◽  
Dongwook Go ◽  
Hyeon-Jong Park ◽  
Wonmin Jeong ◽  
Hye-Won Ko ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Hall Effect ◽  
Spin Current ◽  
Spin Hall Effect ◽  
Spin Orbit ◽  
Magnetic Torque ◽  
Device Applications ◽  
Metal Bilayers ◽  
Experiment Analysis ◽  
Theory And Experiment

AbstractThe orbital Hall effect describes the generation of the orbital current flowing in a perpendicular direction to an external electric field, analogous to the spin Hall effect. As the orbital current carries the angular momentum as the spin current does, injection of the orbital current into a ferromagnet can result in torque on the magnetization, which provides a way to detect the orbital Hall effect. With this motivation, we examine the current-induced spin-orbit torques in various ferromagnet/heavy metal bilayers by theory and experiment. Analysis of the magnetic torque reveals the presence of the contribution from the orbital Hall effect in the heavy metal, which competes with the contribution from the spin Hall effect. In particular, we find that the net torque in Ni/Ta bilayers is opposite in sign to the spin Hall theory prediction but instead consistent with the orbital Hall theory, which unambiguously confirms the orbital torque generated by the orbital Hall effect. Our finding opens a possibility of utilizing the orbital current for spintronic device applications, and it will invigorate researches on spin-orbit-coupled phenomena based on orbital engineering.

scholarly journals MAGNETO-GYROTROPIC PHOTOGALVANIC EFFECTS IN SEMICONDUCTOR QUANTUM WELLS

2008 ◽  
Vol 22 (01n02) ◽  
pp. 115-116 ◽  
Author(s):  
S. D. GANICHEV
Keyword(s):  
Hall Effect ◽  
Electric Current ◽  
Electron Gas ◽  
Spin Hall Effect ◽  
Orbit Coupling ◽  
Relaxation Processes ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Wide Range ◽  
Spin Dependent Scattering

The spin-orbit coupling provides a versatile tool to generate and to manipulate the spin degree of freedom in low-dimensional semiconductor structures. The spin Hall effect, where an electric current drives a transverse spin current and causes a nonequilibrium spin accumulation near the sample boundary,1,2 the spin-galvanic effect, where a nonequilibrium spin polarization drives an electric current3,4 or the reverse process, in which an electrical current generates a non-equilibrium spin-polarization,5–9 are all consequences of spin-orbit coupling. In order to observe a spin Hall effect a bias driven current is an essential prerequisite. Then spin separation is caused via spin-orbit coupling either by Mott scattering (extrinsic spin Hall effect) or by spin splitting of the band structure (intrinsic spin Hall effect). Recently an elementary effect causing spin separation which is fundamentally different from that of the spin Hall effect has been observed.10 In contrast to the spin Hall effect it does not require an electric current to flow: it is spin separation achieved by spin-dependent scattering of electrons in media with suitable symmetry. It is show that by free carrier (Drude) absorption of terahertz radiation spin separation is achieved in a wide range of temperatures from liquid helium temperature up to room temperature. Moreover the experimental results demonstrate that simple electron gas heating by any means is already sufficient to yield spin separation due to spin-dependent energy relaxation processes of non-equilibrium carriers. In order to demonstrate the existence of the spin separation due to asymmetric scattering the pure spin current was converted into an electric current. It is achieved by application of a magnetic field which polarizes spins. This is analogues to spin-dependent scattering in transport experiments: spin-dependent scattering in an unpolarized electron gas causes the extrinsic spin Hall effect, whereas in a spin-polarized electron gas a charge current, the anomalous Hall effect, can be observed. As both magnetic fields and gyrotropic mechanisms were used authors introduced the notation "magneto-gyrotropic photogalvanic effects" for this class of phenomena. The effect is observed in GaAs and InAs low dimensional structures at free-carrier absorption of terahertz radiation in a wide range of temperatures from liquid helium temperature up to room temperature. The results are well described by the phenomenological description based on the symmetry. Experimental and theoretical analysis evidences unumbiguously that the observed photocurrents are spin-dependent. Microscopic theory of this effect based on asymmetry of photoexcitation and relaxation processes are developed being in a good agreement with experimental data. Note from Publisher: This article contains the abstract only.

scholarly journals Inverse spin Hall effect in ferromagnetic metal with Rashba spin orbit coupling

AIP Advances ◽  
2012 ◽  
Vol 2 (3) ◽  
pp. 032147 ◽  
Author(s):  
M.-J. Xing ◽  
M. B. A. Jalil ◽  
Seng Ghee Tan ◽  
Y. Jiang
Keyword(s):  
Hall Effect ◽  
Ferromagnetic Metal ◽  
Spin Hall Effect ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Rashba Spin ◽  
Inverse Spin Hall Effect
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