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Publication Citation: Theory of a magnetic microscope with nanometer resolution

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Author(s): P Johansson; S Apell; David R. Penn;
Title: Theory of a magnetic microscope with nanometer resolution
Published: January 01, 2001
Abstract: 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 tunneling microscope (STM) is used to scan a magnetic substrate while a laser is focused on the STM tip. The electric field between the tip and substrate is enhanced in such a way that the magnetic 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 also 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.
Citation: Physical Review B (Condensed Matter and Materials Physics)
Volume: 64
Issue: 5
Pages: pp. 054411-1 - 054411-13
Keywords: Kerr effect,laser,microscope,nanometer resolution,near field microscopy,STM
Research Areas: Nanomagnetics
PDF version: PDF Document Click here to retrieve PDF version of paper (181KB)