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Lorentz Microscopy of Recorded Magnetization Patterns

 

作者: D. E. Speliotis,   J. R. Morrison,  

 

期刊: Journal of Applied Physics  (AIP Available online 1969)
卷期: Volume 40, issue 3  

页码: 982-984

 

ISSN:0021-8979

 

年代: 1969

 

DOI:10.1063/1.1657809

 

出版商: AIP

 

数据来源: AIP

 

摘要:

We have used the technique of transmission electron microscopy for the static observation of recorded magnetization patterns in high‐coercivity films of cobalt and iron. Such magnetization patterns consist of a series of oppositely magnetized regions, and are characterized by the length of these magnetized regions and by the spatial variation of the magnetization in the transition regions in which the magnetization reverses from one direction to the opposite direction. Magnetic bit patterns of different wavelengths were recorded with conventional high‐resolution transducers and by magnetic transfer from high‐coercivity masters. The Foucault method using the objective aperture diaphragm was found particularly applicable for observing the oppositely magnetized regions, resulting in good contrast for wavelengths as small as 2 &mgr;. For the observation of the magnetization transition regions, the defocus mode was found better applicable. Measurements of the length of the transition region by this method are in good agreement with our theoretical calculations using harmonic analysis to determine the resulting demagnetization.

 

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