Wspólnotowy Serwis Informacyjny Badan i Rozwoju - CORDIS

Evaluation of nano-magnet detection devices

Mn12 patterned arrays supplied by CSIC were imaged by NPL using scanned probes ranging from AFM, MFM STM to UHV-Low temperature STM. The imaging of magnetic nanoparticles by scanned probes as we demonstrated is also a vital aspect for many of the areas of emerging nano-technology; for example, this work impacts on data storage devices and new magnetic storage medium based on magnetic nano particles. The manipulation of nano-particles needed for qubit preparation is also applicable to a wide variety of applications where a bottom-up device fabrication route is needed.

The work of NPL in this area also lead to collaborations and interactions with the University of Posrtsmouth where we used the techniques learnt in this project to image and manipulate magnetic beads attached to DNA. An aspect that arose is that the measurement of magnetism on a nanoscale is both qualitative and non-traceable at the present. If future claims on magnetic properties of nanoparticles is to be verified, then work is needed to develop methods and standards that can address this problem. NPL and its European partners are well placed to take up this challenge.

On the other hand, as the project developed, interest shifted into microwave superradiance emission and detection in magnetic assemblies along the third year, and CSIC-IMM was asked to stop in-house development of more promising small magnetic moment detection by nano-electro-mechanical devices fabricated on GaAs and to supply tools for microwave detection and surface acoustical wave (SAW) devices.

NPL measured and investigated SQUID based devices. These ranged from Nb devices to Al devices and in size from a few microns down to 200nm loop dimensions. Sensitivity and applicability to Mn12 spin detection were addressed.

A novel method of using a SQUID to detect its own sensitivity using a magnetic tipped STM system was developed. This impacts in several areas as it shows the ability to use a magnetic tipped STM to achieve magnetic information on a very minute length scale and also shows the ability to combine two quantum detection systems, an STM and a SQUID in one instrument allowing a combination of topography and magnetic information to be obtained simultaneously. This has potential to impact on several technologically significant areas from magnetic storage to quantum computation.

Development of SAW interdigitated transducers on LiNbO2. Technology for surface acoustical waves (SAW) transducers will impact also on future measurement techniques and applications in the biosensor field.

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TW11 0LW Teddington, Middlesex
United Kingdom
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