Magneto-resistance of organic spin valves due to spin-polarized tunnel injection and extraction of charge carriers

2012 ◽  
Vol 111 (3) ◽  
pp. 034505 ◽  
Author(s):  
A. Goswami ◽  
M. Yunus ◽  
P. P. Ruden ◽  
D. L. Smith
Keyword(s):  
Charge Carriers ◽  
Spin Valves ◽  
Spin Polarized ◽  
Magneto Resistance ◽  
Tunnel Injection

scholarly journals Counter-propagating charge transport in the quantum Hall effect regime

Science ◽  
2019 ◽  
Vol 363 (6422) ◽  
pp. 54-57 ◽  
Author(s):  
Fabien Lafont ◽  
Amir Rosenblatt ◽  
Moty Heiblum ◽  
Vladimir Umansky
Keyword(s):  
Hall Effect ◽  
Quantum Hall Effect ◽  
Electron Gas ◽  
Quantum Hall ◽  
Charge Carriers ◽  
Perpendicular Magnetic Field ◽  
Quantum Hall Regime ◽  
Hall Regime ◽  
Spin Polarized ◽  
Conjugate States

The quantum Hall effect, observed in a two-dimensional (2D) electron gas subjected to a perpendicular magnetic field, imposes a 1D-like chiral, downstream, transport of charge carriers along the sample edges. Although this picture remains valid for electrons and Laughlin’s fractional quasiparticles, it no longer holds for quasiparticles in the so-called hole-conjugate states. These states are expected, when disorder and interactions are weak, to harbor upstream charge modes. However, so far, charge currents were observed to flow exclusively downstream in the quantum Hall regime. Studying the canonical spin-polarized and spin-unpolarized v = 2/3 hole-like states in GaAs-AlGaAs heterostructures, we observed a significant upstream charge current at short propagation distances in the spin unpolarized state.

Spin-polarized transport in magnetically assembled carbon nanotube spin valves

2006 ◽  
Vol 89 (3) ◽  
pp. 033119 ◽  
Author(s):  
R. Thamankar ◽  
S. Niyogi ◽  
B. Y. Yoo ◽  
Y. W. Rheem ◽  
N. V. Myung ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Spin Valves ◽  
Spin Polarized ◽  
Polarized Transport ◽  
Spin Polarized Transport

scholarly journals Theoretical Study of Spin Conduction in the Ni/DTE/Ni Nanohybrid

Nano Hybrids ◽  
2013 ◽  
Vol 4 ◽  
pp. 1-20 ◽  
Author(s):  
Kanchan Ulman ◽  
Mighfar Imam ◽  
Shobhana Narasimhan ◽  
Anders Odell ◽  
Anna Delin
Keyword(s):  
Density Functional ◽  
Transmission Function ◽  
Spin Current ◽  
Functional Theory ◽  
Contact Materials ◽  
Spin Polarized ◽  
Interesting Candidate ◽  
High Bias ◽  
Conductance Ratio ◽  
Magneto Resistance

The photoswitching molecule dithienylethene (DTE) is an interesting candidate for constructing optoelectronic molecular devices since it can be made to switch between a closed and an open conformation using light. We here report computations, based on density functional theory (DFT) and the non-equilibrium Green function (NEGF) method, of the spin-resolved conductance of the two DTE isomers attached to spin-polarized nickel leads. Results are compared and contrasted to those of other contact materials (nonmagnetic Ni, Ag, and Au), analyzing the physical origins of the various features in the transmission function. It was found rather surprisingly, that the two spin channels in the Ni/DTE/Ni device have almost identical I-V characteristics, despite one channel being d-dominated and the other one s-dominated. It was also observed that the Ni-based device exhibits a sustained high conductance ratio also for high bias - a property that may be of relevance in future device design. Furthermore, two computational schemes for calculating the conductance were compared and analyzed. It was found that even for very small bias the molecular orbital polarization was decisive for spin-related properties such as the spin current ratio and magneto-resistance in the Ni/DTE/Ni device.

Underlayer Effect on Magneto-Resistance in Spin-Valves

1997 ◽  
Vol 36 (Part 2, No. 9A/B) ◽  
pp. L1161-L1164 ◽  
Author(s):  
Kazuhiko Hayashi ◽  
Shigeru Mori ◽  
Hidefumi Yamamoto ◽  
Jun-ichi Fujikata ◽  
Masafumi Nakada ◽  
...  
Keyword(s):  
Spin Valves ◽  
Magneto Resistance

scholarly journals Large-amplitude coherent spin waves excited by spin-polarized current in nanoscale spin valves

2007 ◽  
Vol 76 (2) ◽  
Author(s):  
I. N. Krivorotov ◽  
D. V. Berkov ◽  
N. L. Gorn ◽  
N. C. Emley ◽  
J. C. Sankey ◽  
...  
Keyword(s):  
Large Amplitude ◽  
Spin Waves ◽  
Spin Valves ◽  
Spin Polarized ◽  
Coherent Spin

Tunneling of spin-polarized charge carriers in La0.8Ag0.1MnO3+δ film with variant structure: Magnetotransport and magnetooptical data

2005 ◽  
Vol 31 (6) ◽  
pp. 484-487 ◽  
Author(s):  
Yu. P. Sukhorukov ◽  
A. V. Telegin ◽  
E. A. Gan’shina ◽  
N. N. Loshkareva ◽  
A. R. Kaul’ ◽  
...  
Keyword(s):  
Charge Carriers ◽  
Spin Polarized ◽  
Variant Structure

scholarly journals Ferromagnetism and spin-polarized charge carriers inIn2O3thin films

2009 ◽  
Vol 79 (16) ◽  
Author(s):  
Raghava P. Panguluri ◽  
P. Kharel ◽  
C. Sudakar ◽  
R. Naik ◽  
R. Suryanarayanan ◽  
...  
Keyword(s):  
Charge Carriers ◽  
Spin Polarized

scholarly journals Micromagnetic simulations of persistent oscillatory modes excited by spin-polarized current in nanoscale exchange-biased spin valves

2009 ◽  
Vol 105 (7) ◽  
pp. 07D107 ◽  
Author(s):  
G. Siracusano ◽  
G. Finocchio ◽  
I. N. Krivorotov ◽  
L. Torres ◽  
G. Consolo ◽  
...  
Keyword(s):  
Spin Valves ◽  
Micromagnetic Simulations ◽  
Spin Polarized

scholarly journals From spin-polarized interfaces to giant magnetoresistance in organic spin valves

2014 ◽  
Vol 89 (11) ◽  
Author(s):  
Deniz Çakır ◽  
Diana M. Otálvaro ◽  
Geert Brocks
Keyword(s):  
Giant Magnetoresistance ◽  
Spin Valves ◽  
Spin Polarized

Spin-polarized quasiparticle tunnel injection in a YBa2Cu3Oy/Au/Co junction

1999 ◽  
Vol 75 (8) ◽  
pp. 1149-1151 ◽  
Author(s):  
Kiejin Lee ◽  
Wan Wang ◽  
Ienari Iguchi ◽  
Barry Friedman ◽  
Takayuki Ishibashi ◽  
...  
Keyword(s):  
Spin Polarized ◽  
Tunnel Injection
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