| dc.description.abstract | Mn12-acetate single-molecule magnets (SMMs) are nano-scale magnets showing a
strong magnetic anisotropy, slow relaxation and stepwise magnetic hysteresis curves.
Possible applications of Mn12-acetate, e.g. for ultra high density magnetic information
storage device, quantum computation, and magnetic molecular electronics, have been
suggested due to the unusual magnetic behavior. It is an important prerequisite for the
applications to develop a reliable technique to organize the molecules on a surface and to
detect the magnetic signals of the molecules. A solution evaporation technique combined
with conventional lithography is a simple but reliable method to create Mn12-acetate thin
film patterns on the micro/nano-scale. The method is demonstrated with a series of
analysis.
A superconducting quantum interference device (SQUID) shows a non-linear I-V
(Current vs. Voltage) characteristic that is modulated by a magnetic flux inside the loop,
allowing one to sense and analyze an extremely weak magnetic field. The miniaturized
SQUID is appropriate for sensing the magnetic flux from the film structure of the molecular magnets. Theoretical ideas, fabrication, and a measurement technique of the
device are presented.
A new interesting system, the so-called superconductor/SMM hybrid, results from
the experimental configuration. Understanding this new type of hybrid system is
important not only because of the expectation of new phenomena affecting the
functionality of superconducting devices, but also because the two coupled substances
are fundamentally incompatible phases. The first experimental attempt to investigate the
interaction between an aluminum superconducting film and Mn12-acetate SMMs will be
discussed. | en |
