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Low‐Temperature Lorentz Microscopy on “Weak” Ferromagnetics
Author(s) -
Bostanjoglo O.,
Vieweger W.
Publication year - 1969
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.19690320133
Subject(s) - condensed matter physics , lorentz transformation , electron microscope , ferromagnetism , diffraction , microscopy , optical microscope , magnetization , materials science , optics , magnetic domain , physics , magnetic field , scanning electron microscope , classical mechanics , quantum mechanics
Magnetic domains in CrBr 3 and CrI 3 were investigated down to 3 °K in an electron microscope in the Fresnel and Foucault mode of Lorentz microscopy, and by Fraunhofer diffraction. The experimental domain width was found in agreement with the theoretical value calculated by crystal and magnetic energy considerations. In all modes of Lorentz microscopy the electron optical contrast of the ferromagnetic domains in films with low magnetization and small wall width as occur in CrBr 3 and CrI 3 is found to deviate markedly from the predictions of the geometric optical theory but is satisfactorily understood by wave optics.