In situstudies of the properties of micrometre-sized magnetic elements by coherent Foucault imaging
- 14 June 1996
- journal article
- Published by IOP Publishing in Journal of Physics D: Applied Physics
- Vol. 29 (6) , 1419-1427
- https://doi.org/10.1088/0022-3727/29/6/002
Abstract
Coherent Foucault (CF) imaging has been implemented in a transmission electron microscope to obtain magnetic interferograms of micrometre-sized permalloy elements fabricated by electron beam-lithographic and evaporation techniques. The interferograms provide a quantitative description of the distribution of flux throughout the elements. We have observed how this changes under the influence of applied magnetic field and temperature variation. Results are presented for rectangular elements of thickness 30 nm. From the magnetizing experiments, details of the transformation between solenoidal and non-solenoidal magnetization distributions are revealed, whereas the heating experiments show how domain structures are modified as the temperature of the element is increased from room temperature to beyond the Curie point.Keywords
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