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Electron‐Optic Investigation of the Magnetic Stray Field above Bloch Walls in Cylindric Nickel Crystals
Author(s) -
Schwink Ch.,
Schärpf O.
Publication year - 1968
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19680300225
Subject(s) - maxima , condensed matter physics , dipole , magnetic field , physics , electron , crystal (programming language) , field (mathematics) , optics , quantum mechanics , mathematics , art , performance art , computer science , pure mathematics , programming language , art history
An electrostatic electron microscope of high magnification is developed for measuring low magnetic fields of small spatial extension. The method is applied to the investigation of the stray fields above the “convex” 71° Bloch walls of cylindric 〈110〉 Ni crystals causing the well‐known intense colloid lines. We find that these fields have dipole character and are closely related to the domain structure. The distance between the maxima of the both magnetic poles of the dipole stripe lying at the position of each convex Bloch wall varies from 4 to 10 μm. The normal field above the maxima amounts to about 25 Oe at the crystal surface. Generally, it is supposed that colloid patterns ‐ with the exception of very weak lines ‐ are due to dipole fields of the sort described.