The Spin Transport of the Coblt Dimers with Different Directions

2014 ◽  
Vol 543-547 ◽  
pp. 3947-3950
Author(s):  
Shi Wei Ren
Keyword(s):  
Transport Properties ◽  
Spin Polarization ◽  
Density Of States ◽  
Bias Voltage ◽  
Spin Transport ◽  
First Principle ◽  
Transport Direction ◽  
Spin Polarized ◽  
Analysis Calculation

In this paper, the spin transport properties of the coblt dimers parrallel to the transport direction and perpendicular to ransprot direction are investigated by using the first principle analysis. Calculation shows that both the coblt dimers parrallel to the transport direction and perpendicular to ransprot direction give obvious spin polarized density of states and current. It is found that the dimer parrallel to the transport direction have larger spin polarization current.The spin polarized efficiency for the parrallel dimer increase steadily with the increase of the bias voltage. But the the spin polarization for the transverse dimer changes greatly.

scholarly journals Spin Transport Properties in 1D DNA and Electrically Doped Iron Quantum Dot Organo-metallic Junction: A First Principle Paradigm

2021 ◽  
Author(s):  
Debarati Dey Roy ◽  
Pradipta Roy ◽  
Debashis De
Keyword(s):  
Transport Properties ◽  
Bias Voltage ◽  
Density Functional ◽  
Spin Transport ◽  
First Principle ◽  
Dna Sensor ◽  
Ultra Low Power ◽  
High Tunnel ◽  
Parallel Configuration ◽  
Power Application

Abstract The DNA sensor has emerged as strong candidates for next generation ultra low power application due to its self assemble technique. Non-Equilibrium Green’s Function (NEGF) along with Density Functional Theory (DFT) based First Principle approach is used in investigation of spin transport properties along with quantum scattering transmission characteristics of DNA sensor via Iron (Fe) quantum dots (QD) electrodes at room temperature. Electrically doped Fe QD plays an important role in spin transport mechanism. This electrical doping concentration and weak coupling strength between DNA and Fe QD organo-metallic junction effect into the tunneling contact resistance (TCR) along with quantum-ballistic transmission and junction conductivity of parallel and anti-parallel configuration of this analytical model representation. It has been observed that higher current has been achieved for parallel configuration when compare with anti-parallel configuration at same bias voltage. This voltage-current characteristic is significantly modulated due to the electrical doping effect. This spin transport property shows that this system can well perform for anti parallel configuration. High tunnel organo-metallic resistance approximately 99.9% is observed even at 0V bias voltage. TOMCR remains large at upper bias voltage .

Strain modulation on spin transport properties of PTB junction with MoC2 electrodes

2021 ◽  
Author(s):  
Yaoxing Sun ◽  
Bei Zhang ◽  
shidong zhang ◽  
Dan Zhang ◽  
Jiwei Dong ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Electron Transport ◽  
Transport Properties ◽  
Density Functional ◽  
Spin Transport ◽  
Functional Theory ◽  
Spintronic Devices ◽  
Spin Polarized ◽  
Electron Transport Properties ◽  
Strain Modulation

Based on MoC2 nanoribbons and poly-(terphenylene-butadiynylene) (PTB) molecules, we designed MoC2-PTB molecular spintronic devices and investigated their spin-dependent electron transport properties by using spin-polarized density functional theory and non-equilibrium Green's...

Perfect spin-filter devices based on zigzag zinc oxide nanoribbons

2016 ◽  
Vol 30 (32n33) ◽  
pp. 1650392 ◽  
Author(s):  
Zi-Yue Zhang
Keyword(s):  
Zinc Oxide ◽  
Electron Transport ◽  
Spin Polarization ◽  
Bias Voltage ◽  
First Principles ◽  
External Fields ◽  
Spin Filter ◽  
Spin Polarized ◽  
Spin Filters ◽  
Filtering Effect

Spin-polarized electron transport through a zigzag zinc oxide nanoribbon (ZnONR) has been studied using first-principles transport simulations. Ribbons without edges passivated show 100% spin polarization at small bias voltage independently of width. The ribbons with edge zinc atoms passivated maintain absolute spin-filtering effect in much larger bias region. The results demonstrate that zigzag ZnONRs act as perfect spin-filters in the absence of magnetic electrodes and external fields.

Bias voltage-dependent low field spin transport properties of Fe3O4–PEG with different particle sizes

2016 ◽  
Vol 30 (23) ◽  
pp. 1650301
Author(s):  
Chunlong Xu ◽  
Zhen Wang ◽  
Lei Wang ◽  
Gang Shi ◽  
Zhaoyang Hou ◽  
...  
Keyword(s):  
Transport Properties ◽  
Bias Voltage ◽  
Room Temperature ◽  
Spin Transport ◽  
Tunneling Effect ◽  
Particle Sizes ◽  
Low Field ◽  
Spin Dependent Transport ◽  
Voltage Dependent ◽  
Dependent Transport

Spin-dependent transport properties of Fe3O4 spheres with diameters from 200 nm to 900 nm have been investigated and polyethylene glycol (PEG) exists on the surface of Fe3O4 particles. The nonlinear I–V curve became obvious with the increase of Fe3O4 diameter, which indicated the tunneling barrier height decreases with the increasing diameter. The magnetoresistance (MR) can reach −13% with an applied low field of 0.2 T at room temperature. With the diameter increase, the MR decreases and the required applied field increases. Moreover, the decrease of MR with the bias voltage increase can be attributed to the spin-dependent tunneling effect through the insulating surface layer of Fe3O4 and PEG.

Spin transport properties in lower n-acene–graphene nanojunctions

2015 ◽  
Vol 17 (17) ◽  
pp. 11292-11300 ◽  
Author(s):  
Dongqing Zou ◽  
Bin Cui ◽  
Xiangru Kong ◽  
Wenkai Zhao ◽  
Jingfen Zhao ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Transport Properties ◽  
Density Functional ◽  
Spin Transport ◽  
Graphene Nanoribbon ◽  
Function Technique ◽  
Functional Theory ◽  
Spin Polarized ◽  
Non Equilibrium Green’S Function ◽  
Non Equilibrium

A series of n-acene–graphene (n = 3, 4, 5, 6) devices, in which n-acene molecules are sandwiched between two zigzag graphene nanoribbon (ZGNR) electrodes, are modeled through the spin polarized density functional theory combined with the non-equilibrium Green's function technique.

scholarly journals Room-Temperature Spin-Transport Properties in an In0.5Ga0.5As Quantum Dot Spin-Polarized Light-Emitting Diode

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Kohei Etou ◽  
Satoshi Hiura ◽  
Soyoung Park ◽  
Kazuya Sakamoto ◽  
Junichi Takayama ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Transport Properties ◽  
Room Temperature ◽  
Spin Transport ◽  
Light Emitting Diode ◽  
Polarized Light ◽  
Light Emitting ◽  
Spin Polarized

Spin Polarized Tunneling at the Metal-Insulator Transition

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3723-3725 ◽  
Author(s):  
W. Teizer ◽  
F. Hellman ◽  
R. C. Dynes
Keyword(s):  
Spin Polarization ◽  
Density Of States ◽  
Insulator Transition ◽  
Critical Regime ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Spin Polarized ◽  
Quantum Critical ◽  
Spin Polarized Tunneling

We have determined the spin polarized density of states (DOS) of 3-d amorphous Gd x Si 1-x in the quantum critical regime of a tunable Metal-Insulator Transition (MIT). Using a spin polarized BCS DOS we fit the data and extract the spin polarization P.

THERMOELECTRIC EFFECTS IN MESOSCOPIC SUPERCONDUCTOR/FERROMAGNETIC JUNCTIONS

2007 ◽  
Vol 21 (32) ◽  
pp. 5381-5386 ◽  
Author(s):  
ATTIA A. AWAD ALLA ◽  
ADEL H. PHILLIPS
Keyword(s):  
Magnetic Field ◽  
Transport Properties ◽  
Spin Polarization ◽  
Andreev Reflection ◽  
Spin Transport ◽  
Thermoelectric Effects ◽  
Thermoelectric Voltage ◽  
Mesoscopic Superconductor ◽  
Quantum Device ◽  
Heater Current

Spin transport properties of a mesoscopic superconductor/ferromagnetic (S/F) junctions of a quantum device are investigated. The thermoelectric voltage as a function of magnetic field oscillations for different heater currents has been calculated. The dependence shows that by increasing the heater current, the oscillation first disappears, and then remarkably reappears inverted compared to low heater current. Also, the value of the thermo-power increases with increasing value of the barrier strength. Our result shows that the degree of spin polarization of the current can be unambiguously determined using Andreev reflection. Our result agrees qualitatively with those in the literature.

A first principle study on the spin transport properties in heterojunctions based on zigzag-edged graphene nanoribbons and graphitic carbon nitride nanoribbons

RSC Advances ◽  
2015 ◽  
Vol 5 (86) ◽  
pp. 70682-70688 ◽  
Author(s):  
Xiangru Kong ◽  
Dongqing Zou ◽  
Hui Wang ◽  
Xiaohui Jiang ◽  
Sun Yin ◽  
...  
Keyword(s):  
Transport Properties ◽  
Electronic Transport ◽  
Carbon Nitride ◽  
Spin Transport ◽  
Graphene Nanoribbons ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
First Principle ◽  
Electronic Transport Properties ◽  
Non Equilibrium

By using non-equilibrium Green’s functions (NEGF) and DFT, we investigate the spin-dependent electronic transport properties of two heterojunctions based on zigzag-edged graphene nanoribbons and graphitic carbon nitride nanoribbons.

Sign in / Sign up

Export Citation Format

Share Document