Tunnel magnetoresistance of a supramolecular spin valve

We theoretically study the transport properties of a supramolecular spin valve, consisting of a carbon nanotube with two attached magnetic molecules, weakly coupled to metallic contacts. The emphasis is put on analyzing the change of the system's transport properties with the application of an...

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Bibliographic Details
Published in:Europhysics letters 2019-01, Vol.125 (1), p.18004
Main Authors: P omi ska, Anna, Weymann, Ireneusz
Format: Article
Language:English
Subjects:
72.25.-b
75.50.Xx
85.75.-d
Carbon nanotubes
Electric potential
Ferromagnetism
Magnetic properties
Magnetoresistivity
Polarization (spin alignment)
Real time
Spin valves
Transport properties
Tunnel magnetoresistance
Voltage
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Summary:We theoretically study the transport properties of a supramolecular spin valve, consisting of a carbon nanotube with two attached magnetic molecules, weakly coupled to metallic contacts. The emphasis is put on analyzing the change of the system's transport properties with the application of an external magnetic field, which aligns the spins of the molecules. It is shown that magnetoresistive properties of the considered molecular junction, which are associated with changing the state of the molecules from the superparamagnetic to the ferromagnetic one, strongly depend on the applied bias voltage and the position of the nanotube's orbital levels, which can be tuned by a gate voltage. A strong dependence on the transport regime is also found in the case of the spin polarization of the current flowing through the system. The mechanisms leading to those effects are explained by invoking appropriate molecular states responsible for transport. The analysis is done with the aid of the real-time diagrammatic technique up to the second order of expansion with respect to tunneling processes.
ISSN:0295-5075
1286-4854
1286-4854
DOI:10.1209/0295-5075/125/18004