Monday, January 29, 2007

Picture of the day


Magnetic domains in a thin cobalt film


University of Cambridge Department of Materials Science & Metallurgy Gallery, 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 200┬Ám. 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

Visit the University of Cambridge Department of Materials Science & Metallurgy Gallery.

I will post the others in this series over time. To see it all now, visit the Nanotechnology Now Gallery.

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