Abstract
The magnetic structure of a single crystal Tb 2Fe 14B sample, grown by the Czochralski process, was studied using polarized light microscopy with a xenon light source. The domain wall energy, domain wall thickness, and critical single domain particle size were calculated from measurements of equilibrium domain widths in thin crystals. The calculated values were compared with previous results from other permanent magnetic compounds. The changes in domain wall energy, γ, in RE 2Fe 14B (RE=rare earth elements) single crystals are proportional to changes in magnetic anisotropy constant, K 1. The changes in domain wall thickness, δ, in these single crystals, on the other hand, are inversely proportional to changes in K 1. Both of these trends are in agreement with the continuum model (D.J. Craik, Contemp. Phys. 11 (1970) 65).
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