Domain-wall energy in sintered Nd15Fe77B8 permanent magnet |
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Authors: | D P?usa J J Wys?ocki B Wys?ocki R Pfranger |
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Institution: | (1) Institute of Physics, Technical University of Czestochowa, Al. Zawadzkiego 19, PL-42-200 Czestochowa, Poland |
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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: = 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 thickness
B=89 Å, and the critical diameter for single domain particlesD
c=0.67 m. |
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Keywords: | 75 50 Bb 75 60 Chi 75 60 Gm |
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