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FP5

NANOMAGIQC Résumé de rapport

Project ID: IST-2001-33186
Financé au titre de: FP5-IST
Pays: United Kingdom

Measurement of fundamental behaviour of nano-magnets

Measurements of the magnetisation of single crystals of Mn12 as a function of temperature and magnetic field were made by NPL using a SQUID susceptometer at Oxford University, UK. Also NPL set up a measurement method to detect the microwave radiation emanating from single crystals using novel high temperature superconductor Josephson junctions.

In addition, two different types of experiments looking for radiation emission were performed by UB. In the first type of experiments, the radiation was directly detected by using bolometers and transporting the radiation using waveguides. From these experiments the power emission was correlated to the different parameters governing the emission of superradiance in general.

In the second type of experiments, the tunnelling transition for fast sweep rate was found to be in agreement with the emission of superradiance and not longer governed by the Landau Zener law NPL masked magnetisation curves on several samples of Mn12 single crystals supplied by CSIC. These measurements were performed using a SQUID magnetometer/ susceptometer system at Oxford University allowing to form a close working relationship with their group.

In collaboration with Chalmers University (Sweden), NPL also incorporated novel high temperature superconductor Josephson junction detectors. This link to a foremost European institute is proving very beneficial to both parties. Combining the measurement expertise at NPL with the fabrication facilities at Chalmers puts Europe in a very strong position to lead future work in the THz detection and source areas which may well have a very important impact on future quality of life.

Reported by

NPL MANAGEMENT LIMITED
NATIONAL PHYSICAL LABORATORY, QUEENS ROAD
TW11 0LW Teddington, Middlesex
United Kingdom