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Spin Configuration and Intrinsic Coercive Field of Narrow Domain Walls in Co 5 R‐Compounds
Author(s) -
Hilzinger H. R.,
Kronmüller H.
Publication year - 1972
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.2220540223
Subject(s) - coercivity , condensed matter physics , domain wall (magnetism) , ferromagnetism , micromagnetics , anisotropy , physics , lattice constant , lattice (music) , field (mathematics) , perpendicular , anisotropy energy , spin (aerodynamics) , magnetic anisotropy , magnetic field , optics , geometry , magnetization , quantum mechanics , thermodynamics , mathematics , diffraction , acoustics , pure mathematics
In ferromagnetic materials with large anisotropy constants ( K 1 > 10 8 erg/cm 3 ) the domain wall width, δB, is of the order of magnitude of a few lattice constants (10 to 30 Å). The spin configuration of such 180°‐walls in Co 5 R‐compounds is determined within the framework of the Heisenberg model. It is found that the deviations from the micromagnetic solution occur mainly in the centre of the wall. The wall energy was found to depend periodically on the position of the wall centre with respect to the crystal lattice. The oscillations of the wall energy give rise to a coercive field H c = const ( A/D ) exp [– π δ B / D ] (A exchange constant, D wavelength perpendicular to the domain wall). The possibilities to obtain large intrinsic coercive fields are discussed in some detail.