KENBIKYO Vol.50▶No.2 2015
â– Lectures

Lorentz Microscopy

Ken Harada

Hitachi Ltd., Research & Development Group

Abstract: Magnetic structures of magnetic materials are not easy objects for visualizing by electron microscope because strong magnetic field caused by electron lens modulates their structure. Therefore, a specially customized electron microscope, named Lorentz microscope, has been used for the observation. Recently, however, the observation technology of the magnetic structures is improved in Lorentz microscopy and small angle electron diffraction, for example, the development of Foucault imaging method by using a non-dedicated transmission microscope. This paper introduces the principle of Lorentz microscopy and the latest methods.

Key words: Lorentz microscopy, Fresnel method, Foucault method, magnetic material, magnetic domain wall, magnetic domain