Regensburg 2007 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 32: Magnetic Imaging

MA 32.6: Vortrag

Freitag, 30. März 2007, 12:15–12:30, H22

Suggestion for a depth-resolved magnetic microscopy via the circular magnetic dichroism in two-photon absorption — •Jonas Seib and Manfred Fähnle — Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart

The 4π-confocal-STED-microscopy based on an two-photon absorption is a very powerful tool for the depth-resolved microscopy of nonmagnetic materials like biological systems and semiconductor devices, with a vertical resolution of up to 30nm in the optical regime. It is suggested to use this technique in combination with the circular magnetic dichroism for a depth-resolved magnetic microscopy.

For a more quantitative underpinning of this suggestion we have performed calculations for the simplest possible model system which exhibits magnetic circular dichroism, i.e., a Dirac atom in an external magnetic field, yielding a dichroism also in two-photon absorption. It is discussed under which circumstances this type of microscopy is feasible, and it is suggested to investigate the threedimensional structure of closure domains in magnetic semiconductors by this technique.