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Details of Grant 

EPSRC Reference: GR/L42094/01
Title: MFM TIP CHARACTERISATION USING NOVEL COATINGS,STANDARD SAMPLES,ELECTRON TOMOGRAPHY & MICROMAGNETIC MODELS
Principal Investigator: Rainforth, Professor WM
Other Investigators:
Tucker, Professor J Gibbs, Professor M McVitie, Professor S
Davies, Professor HA
Researcher Co-Investigators:
Project Partners:
Department: Materials Science and Engineering
Organisation: University of Sheffield
Scheme: Standard Research (Pre-FEC)
Starts: 01 October 1997 Ends: 30 September 2000 Value (£): 131,242
EPSRC Research Topic Classifications:
Surfaces & Interfaces
EPSRC Industrial Sector Classifications:
No relevance to Underpinning Sectors
Related Grants:
Panel History:  
Summary on Grant Application Form
Sensing tips with different magnetic properties give MFM images containing different information. No model exists of tips/sample interactions which allows reliable image interpretation. The probe coercivity is of critical importance to the image formed since, if the stray field from the sample is greater than the probe's coercivity, random remagnetisation of the probe occurs during scanning, introducing image artefacts. It is important, therefore to develop tips with ultra-high coercivity to minimise this effect. To alleviate uncertainties regarding tip remagnetisation, an alternative approach is to use a probe with a coercivity as small as possible such that predictable switching of the probe's moment occurs. Thus, tips are required which have both as high a coercivity as possible and as low a coercivity as possible. In addition, tips are required with low moment which avoid perturbing the domain structure of low coercivity samples. Tips will be sputter coated with a variety of low and high coercivity coatings. The magnetic characteristics of the tip will be determined using Lorentz microscopy. MFM images will be obtained from model and commercially important magnetic materials and thin films. Modelling will be undertaken to correlate experimental images.
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Organisation Website: http://www.shef.ac.uk