Theory of a magnetic microscope with nanometer resolution

Details Theory of a magnetic microscope with nanometer resolution Theory of a magnetic microscope with nanometer resolution

2001-02-13

arxiv.org/abs/cond-mat/0102226v1

Phys. Rev. B 64, 054411 (2001).

Physics

Condensed Matter

17 pages, 8 figures

Scientific paper

10.1103/PhysRevB.64.054411

We propose a theory for a type of apertureless scanning near field microscopy that is intended to allow the measurement of magnetism on a nanometer length scale. A scanning probe, for example a scanning tunneling microscope (STM) tip, is used to scan a magnetic substrate while a laser is focused on it. The electric field between the tip and substrate is enhanced in such a way that the circular polarization due to the Kerr effect, which is normally of order 0.1% is increased by up to two orders of magnitude for the case of a Ag or W tip and an Fe sample. Apart from this there is a large background of circular polarization which is non-magnetic in origin. This circular polarization is produced by light scattered from the STM tip and substrate. A detailed retarded calculation for this light-in-light-out experiment is presented.

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