OBSERVATION METHOD OF MAGNETIC SECTOR CONSTRUCTION USING ELECTRON MICROSCOPE

摘要

PURPOSE:To observe a magnetic sector construction wit no effect from magnetic fields by placing a sample at a slant in an objective lens of an electron microscope so that a scanned image can be obtained by means of reflected electrons from the sample and by turning the objective lens off. CONSTITUTION:When observing a magnetic sample, if it is desired to apply no magnetic field to a sample first, an objective lens is turned off and an electron beam is converged by a focusing lens so as to focus a spot on the sample 4, then the electron beam is scanned by deflection coils 5a, 5b on the sample in two dimensions. Electrons reflected by this scan from the sample surface are detected by a detector 11, then the signals are fed to a CRT 8 and a magnetic sector construction of the sample is displayed as a cscanned image. If it is desired to observe the effect from magnetic fields on the sample, the objective lens is energized on and the magnetic field with a desired strength can be applied. By radiating the electron beam, not only reflected electrons but also transmission electrons are generated. Therefore, if a diffracted pattern is focused on a phosphor screen by using an intermediate lens 13 and a projecting lens 14, the direction of the sample can be determined conveniently.