| EPSRC Reference: |
GR/J81372/01 |
| Title: |
THERMAL ACTIVATION OF MAGNETIC SWITCHING AND THE EFFECT OF DISLOCATIONS ON MAGNETIC DOMAIN STRUCTURES |
| Principal Investigator: |
Williams, Professor W |
| Other Investigators: |
|
| Researcher Co-Investigators: |
|
| Project Partners: |
|
| Department: |
Institute of Geography |
| Organisation: |
University of Edinburgh |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 May 1994 |
Ends: |
30 April 1997 |
Value (£): |
64,341
|
| EPSRC Research Topic Classifications: |
| Materials Characterisation |
|
|
| EPSRC Industrial Sector Classifications: |
|
| Related Grants: |
|
| Panel History: |
|
|
Summary on Grant Application Form |
|
This research programme exploits advances in computer technology, and builds on recent developments in fine particle magnetism, in order to investigate the factors controlling the magnetic switching process in small grains with non-uniform magnetisation structures (called PSD grains). In large PSD grains distinct domain walls develop, and crystal dislocations are likely to be the dominant barrier to changes in the domain structures. We will use high resolution micromagnetic models to examine the interaction of domain walls with grain shape and grain imperfections.In slightly smaller PSD grains, domain switching will occur by incoherent reversal of the magnetisations structure. The nature of the energy barriers between different domain states will be examined by parameterising the model in terms of certain constrained elements within the model. The effect of thermal fluctuations will be examined by a modification of the simulated annealing method of optimisation, and this will allow the first accurate estimates of the temperatures below which a grains non-uniform magnetisation becomes blocked.
|
|
Key Findings |
|
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
|
|
Potential use in non-academic contexts |
|
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
|
|
Impacts |
|
| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
|
| Date Materialised |
|
|
|
|
Sectors submitted by the Researcher |
|
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
|
| Project URL: |
|
| Further Information: |
|
| Organisation Website: |
http://www.ed.ac.uk |