The smallest system for storing and processing information using the magnetic states is a single atom. The magnetic anisotropy plays an essential role here, since it defines the energy barrier between the degenerate ground states of the spin. We have studied for the role of the magnetic anisotropy in single magnetic atoms adsorbed on an ultra-thin insulating barrier on metal surfaces. We have established under which conditions the Kondo effect can occur; for applications in data storage and processing this effect is undesirable, since it leads to mixing between the spin states (decoherence).
COBISS.SI-ID: 22427175
The electronic transport through a molecule in the Kondo regime is investigaed. The tunneling between the electrode and the molecule is asymmetrically modulated by the oscillations of the molecule. If the molecule gets closer to one of the electrodes the tunneling to that electrode will increase and at the critical value of the electron-phonon coupling an unstable two-channel Kondo fixed point is found. For a realistic modulation the spin at the molecular orbital is Kondo screened by the even conduction channel even in the regime of strong coupling.
COBISS.SI-ID: 2143332