scholarly journals Spin transport properties in Heisenberg antiferromagnetic spin chains: Spin current induced by twisted boundary magnetic fields

2006 ◽  
Vol 73 (21) ◽  
Author(s):  
Wei Zhuo ◽  
Xiaoqun Wang ◽  
Yupeng Wang
Keyword(s):  
Magnetic Fields ◽  
Transport Properties ◽  
Spin Transport ◽  
Spin Current ◽  
Spin Chains ◽  
Antiferromagnetic Spin

scholarly journals Transport and Energetic Properties of a Ring of Interacting Spins Coupled to Heat Baths

Entropy ◽  
2019 ◽  
Vol 21 (3) ◽  
pp. 228 ◽  
Author(s):  
Xiansong Xu ◽  
Kenny Choo ◽  
Vinitha Balachandran ◽  
Dario Poletti
Keyword(s):  
Steady State ◽  
Transport Properties ◽  
Spin Transport ◽  
Spin Current ◽  
Nonequilibrium Steady State ◽  
Heat Current ◽  
Temperature Bias ◽  
Different Temperatures ◽  
Avoided Crossings ◽  
Current Flows

We study the heat and spin transport properties in a ring of interacting spins coupled to heat baths at different temperatures. We show that interactions, by inducing avoided crossings, can be a means to tune both the total heat current flowing between the ring and the baths, and the way it flows through the system. In particular, we recognize three regimes in which the heat current flows clockwise, counterclockwise, and in parallel. The temperature bias between the baths also induces a spin current within the ring, whose direction and magnitude can be tuned by the interaction. Lastly, we show how the ergotropy of the nonequilibrium steady state can increase significantly near the avoided crossings.

scholarly journals Nonmagnetic single-molecule spin-filter based on quantum interference

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Atindra Nath Pal ◽  
Dongzhe Li ◽  
Soumyajit Sarkar ◽  
Sudipto Chakrabarti ◽  
Ayelet Vilan ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Single Molecule ◽  
Quantum Interference ◽  
Spin Transport ◽  
Spin Current ◽  
Spin Transfer Torque ◽  
Spin Splitting ◽  
Spin Polarized ◽  
Noise Measurements ◽  
Low Sensitivity

AbstractKey spin transport phenomena, including magnetoresistance and spin transfer torque, cannot be activated without spin-polarized currents, in which one electron spin is dominant. At the nanoscale, the relevant length-scale for modern spintronics, spin current generation is rather limited due to unwanted contributions from poorly spin-polarized frontier states in ferromagnetic electrodes, or too short length-scales for efficient spin splitting by spin-orbit interaction and magnetic fields. Here, we show that spin-polarized currents can be generated in silver-vanadocene-silver single molecule junctions without magnetic components or magnetic fields. In some cases, the measured spin currents approach the limit of ideal ballistic spin transport. Comparison between conductance and shot-noise measurements to detailed calculations reveals a mechanism based on spin-dependent quantum interference that yields very efficient spin filtering. Our findings pave the way for nanoscale spintronics based on quantum interference, with the advantages of low sensitivity to decoherence effects and the freedom to use non-magnetic materials.

Spin transport properties in silicon in a nonlocal geometry

2011 ◽  
Vol 83 (24) ◽  
Author(s):  
Masashi Shiraishi ◽  
Yoshiya Honda ◽  
Eiji Shikoh ◽  
Yoshishige Suzuki ◽  
Teruya Shinjo ◽  
...  
Keyword(s):  
Transport Properties ◽  
Spin Transport

Spin transport properties based on spin gapless semiconductor CoFeMnSi

2017 ◽  
Vol 111 (13) ◽  
pp. 132402 ◽  
Author(s):  
Jiangchao Han ◽  
Yulin Feng ◽  
Kailun Yao ◽  
G. Y. Gao
Keyword(s):  
Transport Properties ◽  
Spin Transport

scholarly journals Spin transport and spin dynamics in antiferromagnets

2021 ◽  
Author(s):  
◽  
Geert Hoogeboom
Keyword(s):  
Magnetic Field ◽  
Heavy Metal ◽  
Spin Transport ◽  
Spin Dynamics ◽  
Magnetic Moments ◽  
Spin Current ◽  
Active Role ◽  
Metal Films ◽  
Alternating Direction ◽  
High Processing

Ferromagnets (FMs) have been a key ingredient in information technology because it is easy to manipulate and read out the magnetization. Antiferromagnets (AFMs) have magnetic moments with alternating direction resulting in negligible magnetization. This gives them high processing and device downscaling features, but this also makes it challenging to manipulate and interact with the AFM order. This thesis studies this interaction with antiferromagnets. NiO AFM order has been read out by electrically injecting spin current via the spin Hall effect in thin heavy metal films. In DyFeO3, both Dy and Fe magnetic moments, their excitation and interaction have been probed. A magnetic field lifts the degeneracy of magnetic excitations with opposite magnon spin, allowing a spin current to be detected nonlocally. The AFM order and the generation of spin current can easily be controlled by an adjacent FM. Thereby, we show that AFMs have the potential to play an active role in spintronics.

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