Issue
EPL
Volume 78, Number 2, April 2007
Article Number 27003
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/78/27003
Published online 02 April 2007
EPL, 78 (2007) 27003
DOI: 10.1209/0295-5075/78/27003

Quantum tunneling of magnetization in single molecular magnets coupled to ferromagnetic reservoirs

M. Misiorny1 and J. Barnas1, 2

1  Department of Physics, Adam Mickiewicz University - 61-614 Poznan, Poland
2  Institute of Molecular Physics, Polish Academy of Sciences - 60-179 Poznan, Poland

barnas@amu.edu.pl

received 28 December 2006; accepted in final form 6 March 2007; published April 2007
published online 2 April 2007

Abstract
The role of spin polarized reservoirs in quantum tunneling of magnetization and relaxation processes in a single molecular magnet (SMM) is investigated theoretically. The SMM is exchange-coupled to the reservoirs and also subjected to a magnetic field varying in time, which enables the quantum tunneling of magnetization. The spin relaxation times are calculated from the Fermi golden rule. The exchange interaction of SMM and electrons in the leads is shown to affect the spin reversal due to quantum tunneling of magnetization. It is shown that the switching is associated with transfer of a certain charge between the leads.

PACS
75.50.Xx - Molecular magnets.
75.60.Jk - Magnetization reversal mechanisms.
75.45.+j - Macroscopic quantum phenomena in magnetic systems.

© Europhysics Letters Association 2007