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2 Materials Science Poland

2 2007

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Spin reversal processes in a single molecular magnet between two ferromagnetic leads

Misiorny M., Barnaś J.

Materials Science Poland

2007

Vol. 25, No. 2

505--511

The effect of spin polarized transport between ferromagnetic metallic electrodes on the relaxation process of a single molecular magnet (SMM) is considered theoretically. The relaxation times are calculated in the second order approximation (Fermi golden rule). The main objective of the work is to analyze the possible mechanisms responsible for the reversal of a SMM's spin. We investigate the regime in which the spin reversal is driven by an external magnetic field. In such a case, the magnetic switching of a SMM is essentially induced by the quantum tunneling of magnetization. The total charge flowing between the electrodes during the reversal process is calculated, and the analysis shows that such a system under consideration can serve as an electronic pump.

Current-induced switching of a single-molecule magnet with an arbitrary oriented easy axis

Misiorny M., Barnaś J.

Materials Science Poland

2007

Vol. 25, No. 4

1235--1241

The main objective of this work was to investigate theoretically how tilting of an easy axis of a singlemolecule magnet (SMM) from the orientation collinear with magnetic moments of the leads affects the switching process induced by current flowing through the system. We consider a model system that consists of a SMM embedded in the nonmagnetic barrier of a magnetic tunnel junction. The anisotropy axis of the SMM forms an arbitrary angle with magnetic moments of the leads (the latter ones are assumed to be collinear). The reversal of the SMM's spin takes place due to exchange interaction between the molecule and electrons tunnelling through the barrier. The current flowing through the system as well as the average z-component of the SMM's spin are calculated in the second-order perturbation description (Fermi golden rule).