SPIN-FILTERING, RECTIFYING AND NEGATIVE DIFFERENTIAL RESISTANCE BEHAVIORS IN Co(dmit)2 MOLECULAR DEVICES WITH MONATOMIC (C, Fe, Au) ELECTRODES

SPIN ◽  
2014 ◽  
Vol 04 (02) ◽  
pp. 1440016
Author(s):  
SHENLANG YAN ◽  
MENGQIU LONG ◽  
XIAOJIAO ZHANG ◽  
JUN HE ◽  
HUI XU ◽  
...  
Keyword(s):  
Single Molecule ◽  
Negative Differential Resistance ◽  
Density Functional ◽  
Electrode Materials ◽  
Energy Levels ◽  
Differential Resistance ◽  
Interesting Phenomenon ◽  
Filtering Effect ◽  
Dependent Transport ◽  
Spin Filtering

Using nonequilibrium Green's functions (NEGFs) combined with the density functional theory (DFT), we study the electronic transport properties of a single molecule magnet Co ( dmit )2, which is sandwiched between two monatomic chain electrodes, and the different electrode materials carbon, iron and gold, have been considered. The results show that the electrodes play a crucial role in the spin-dependent transport of the Co ( dmit )2 molecular device, and some interesting phenomenon, such as perfect spin-filtering effect, rectifying and negative differential resistance (NDR) can be observed. We demonstrated that the magnetic Fe electrode can lead to high spin-flittering effect, and the different hybridization and alignment of energy levels between the molecule and the electrodes may be responsible for the rectification performance, and the distributions (delocalization or localization) of the frontier molecular orbitals under different bias result in the NDR behaviors. These characteristics could be used in the study of spin physics and the realization of nanospintronic devices.

scholarly journals Spin-Transport Tuning of Individual Magnetic Mn-Salophen Molecule via Chemical Adsorption

Molecules ◽  
2019 ◽  
Vol 24 (9) ◽  
pp. 1747 ◽  
Author(s):  
Feifei Li ◽  
Jing Huang ◽  
Jianing Wang ◽  
Qunxiang Li
Keyword(s):  
Single Molecule ◽  
Magnetic Moment ◽  
Density Functional ◽  
Spin Transport ◽  
Density Functional Theory Calculations ◽  
Chemical Adsorption ◽  
Adsorption Effect ◽  
Single Molecule Level ◽  
Filtering Effect ◽  
Spin Filtering

Control over spin states at the single molecule level is a key issue in the emerging field of molecular spintronics. Here, we explore the chemical adsorption effect on the magnetic and spin-transport properties of individual magnetic molecule by performing extensive density functional theory calculations in combining with non-equilibrium Green’s function method. Theoretical results clearly reveal that the molecular magnetic moment of Mn-salophen can be effectively tuned by adsorbing F and CO on the central Mn cation, while the adsorbed NO molecule quenches the molecular magnetic moment. Without chemical adsorption, the currents through Mn-salophen molecular junction just show a little distinction for two spin channels, which agrees well with previous investigation. Remarkably, the conductive channel can be switched from the spin-up electrons to the spin-down electrons via adsorbing F and CO, respectively, and the corresponding two Mn-salophen molecular junctions with chemical modifications display nearly perfect spin-filtering effect. The observed spin switch and the predicted spin-filtering effect via chemical adsorption indicates that Mn-salophen holds potential applications in molecular spintronic devices.

Fine Spin Filtering Effect in Co-Phthalocyanine Molecule Induced by the Spin Polarization of Co Atom

2014 ◽  
Vol 597 ◽  
pp. 127-130
Author(s):  
Yan Hong Zhou ◽  
X.H. Qiu ◽  
L.L. Zhou ◽  
Y.L. Peng
Keyword(s):  
Single Molecule ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Underlying Mechanism ◽  
Spintronic Devices ◽  
Spin Direction ◽  
Spin Polarized ◽  
Phthalocyanine Molecule ◽  
Filtering Effect ◽  
Spin Filtering

Spintronic devices will play a very important role in future information technology. In this study, By spin-polarized density-functional theory calculations combined with the Keldysh nonequilibrium Green’s method, the effect of the spin direction of Co atom in Co- phthalocyanine molecule in modulating spin filtering effects under external biases are investigated. Here, an individual single molecule Co-phthalocyanine is sandwiched between two infinite 8-zigzag-graphene nanoribbon electrodes. we find that the spin direction of the Co atom relative to the magnetic polarization of the left and right electrodes can improve the spin filtering effect greatly. when the polarization direction of the two electrodes is antiparallel and the polarization of Co atom in the Co-phthalocyanine molecule upward, the configuration posesses almost perfectly spin-filter effect. The underlying mechanism of the perfect spin filtering action is applied.

Negative differential resistance, perfect spin-filtering effect and tunnel magnetoresistance in vanadium-doped zigzag blue phosphorus nanoribbons

2018 ◽  
Vol 20 (32) ◽  
pp. 21105-21112 ◽  
Author(s):  
Si-Cong Zhu ◽  
Shun-Jin Peng ◽  
Kai-Ming Wu ◽  
Cho-Tung Yip ◽  
Kai-Lun Yao ◽  
...  
Keyword(s):  
Transport Properties ◽  
Quantum Transport ◽  
First Principles ◽  
Negative Differential Resistance ◽  
Differential Resistance ◽  
Tunnel Magnetoresistance ◽  
Filtering Effect ◽  
Spin Filtering

We investigate the electronic and transport properties of vanadium-doped zigzag blue phosphorus nanoribbons by first-principles quantum transport calculations.

Significant tunneling magnetoresistance and excellent spin filtering effect in CrI3-based van der Waals magnetic tunnel junctions

2020 ◽  
Vol 22 (26) ◽  
pp. 14773-14780 ◽  
Author(s):  
Zhi Yan ◽  
Ruiqiang Zhang ◽  
Xinlong Dong ◽  
Shifei Qi ◽  
Xiaohong Xu
Keyword(s):  
Transport Properties ◽  
Negative Differential Resistance ◽  
Tunnel Junctions ◽  
Van Der Waals ◽  
Magnetic Tunnel Junctions ◽  
Differential Resistance ◽  
Tunneling Magnetoresistance ◽  
Positive Bias ◽  
Filtering Effect ◽  
Spin Filtering

The transport properties of CrI3/h-BN/n·CrI3 (n = 1, 2, 3, 4) MTJs under positive bias voltages exhibit an interesting odd-even effect. Significant tunneling magnetoresistance, a perfect spin filtering effect and remarkable negative differential resistance were obtained.

Effects of different tailoring graphene electrodes on the rectification and negative differential resistance of molecular devices

2018 ◽  
Vol 32 (29) ◽  
pp. 1850323
Author(s):  
Ting Ting Zhang ◽  
Cai Juan Xia ◽  
Bo Qun Zhang ◽  
Xiao Feng Lu ◽  
Yang Liu ◽  
...  
Keyword(s):  
Electronic Transport ◽  
Negative Differential Resistance ◽  
Density Functional ◽  
Graphene Nanoribbons ◽  
Differential Resistance ◽  
Voltage Characteristic ◽  
Molecular Devices ◽  
Current Voltage Characteristic ◽  
Functional Theory ◽  
Current Voltage

The electronic transport properties of oligo p-phenylenevinylene (OPV) molecule sandwiched with symmetrical or asymmetric tailoring graphene nanoribbons (GNRs) electrodes are investigated by nonequilibrium Green’s function in combination with density functional theory. The results show that different tailored GNRs electrodes can modulate the current–voltage characteristic of molecular devices. The rectifying behavior can be observed with respect to electrodes, and the maximum rectification ratio can reach to 14.2 in the asymmetric AC–ZZ GNRs and ZZ–AC–ZZ GNRs electrodes system. In addition, the obvious negative differential resistance can be observed in the symmetrical AC-ZZ GNRs system.

Thermal spin filtering, thermal spin switching and negative-differential-resistance in thermal spin currents in zigzag SiC nanoribbons

2014 ◽  
Vol 16 (33) ◽  
pp. 17493-17498 ◽  
Author(s):  
Dan-Dan Wu ◽  
Hua-Hua Fu ◽  
Lei Gu ◽  
Yun Ni ◽  
Feng-Xia Zu ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Negative Differential Resistance ◽  
Differential Resistance ◽  
Spin Filter ◽  
Spin Currents ◽  
Heterojunction Device ◽  
Spin Switching ◽  
Spin Filtering

A thermoelectric heterojunction device based on zigzag silicon carbide nanoribbons can serve as a perfect thermal spin filter and switcher.

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