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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)|
|Pages:||pp. 054411-1 - 054411-13|
|Keywords:||Kerr effect,laser,microscope,nanometer resolution,near field microscopy,STM|
|PDF version:||Click here to retrieve PDF version of paper (181KB)|