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On the Visibility of Bitter Powder Patterns on Ferromagnetic Films with Bloch and Ne´el‐Type Domain Walls

 

作者: A. L. Olson,  

 

期刊: Journal of Applied Physics  (AIP Available online 1967)
卷期: Volume 38, issue 4  

页码: 1869-1871

 

ISSN:0021-8979

 

年代: 1967

 

DOI:10.1063/1.1709773

 

出版商: AIP

 

数据来源: AIP

 

摘要:

It is known that in ferromagnetic films, the Bitter powder pattern of a Ne´el‐type domain wall is much more visible than that of a Bloch wall. The Bitter powder particles are held in place by the magnitude of the stray fields from the domain walls. Calculations on the basis of the simplest wall models show that the magnitude of the component of the Ne´el wall stray field parallel to the film surface is identical with the magnitude of the Bloch wall stray field perpendicular to the film surface. This is not found to be true if the calculations are made using a theoretical Bloch wall model proposed by Brown and LaBonte and an empirical Ne´el wall model as measured with Lorentz microscopy techniques by Fuchs. These calculations show that the ratio of the magnitude of the Ne´el wall stray field component parallel to the film surface to the magnitude of the Bloch wall stray field component perpendicular to the film surface as a function of the distance above the film surface increases almost linearly to a value of 29 at 10 000 Å.

 

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