Volume 125, Number 1, January 2019
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||01 February 2019|
Tunnel magnetoresistance of a supramolecular spin valve
Faculty of Physics, Adam Mickiewicz University - Poznań, Poland
Received: 28 November 2018
Accepted: 1 January 2019
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.
PACS: 85.75.-d – Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields / 75.50.Xx – Molecular magnets / 72.25.-b – Spin polarized transport
© EPLA, 2019
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