Springer Online Journal Archives 1860-2000
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Abstract From measurements of the magnetic domain widthsD versus grain thicknessL, we have determined the domain wall energy in the demagnetized state for a sintered Nd15Fe77B8 magnet:γ = 56 erg/cm2. Using this wall energy and the published magnetocry-stalline constantK 1=4.9×107 erg/cm3, we have calculated the exchange constantA=4.0×10−6 erg/cm, domain wall thicknessδ B=89 Å, and the critical diameter for single domain particlesD c=0.67 μm.
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