| Abstract Scope |
Electron holography, which is a method related to transmission electron microscopy, can be a powerful tool for revealing the magnetic structures in a nanometer-scaled area. This method determines the phase shift in the incident electron wave that has traversed a thin-foil specimen. Because of the progress in the peripheral techniques in the previous 10 years (i.e., processing to reduce undesired phase information, methods of noise reduction, application of high-sensitive camera, etc.), the precision of electron holography has been improved significantly. We will discuss about several topics about recent electron holography observations, including (1) development/depression of the ferromagnetic spin order in planar defects (i.e., antiphase boundaries), (2) magnetic flux density measurements from narrow grain boundaries in sintered magnets, and (3) applications of information science and technologies for further improvement of sensitivity in electron holography. |