Magnetic domains in a thin cobalt film
The colours in the image show the different directions of the magnetic field in a layer of polycrystalline cobalt that has a thickness of only 20nm. The direction of the magnetic field in the film changes at the positions of domain walls. The field of view is approximately 200µm. The image was acquired using the Fresnel mode of Lorentz microscopy in a field emission gun transmission electron microscope. It was recorded out of focus to enhance the contrast of the domain walls, and then converted to a colour induction map by applying the Transport of Intensity Equation to the image intensity. (click to see full sized version)
Acknowledgments: Anke Husmann, Martha McCartney, Chris Boothroyd, Rafal Dunin-Borkowski
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