HYSTERESIS LOOPS AND THE DEMAGNETIZATION PROCESS AT 4.2 K FOR MELT-SPUN ND13FE77B10

Citation
Hm. Jin et al., HYSTERESIS LOOPS AND THE DEMAGNETIZATION PROCESS AT 4.2 K FOR MELT-SPUN ND13FE77B10, Journal of physics. Condensed matter, 10(2), 1998, pp. 389-399
Citations number
12
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
0953-8984
Volume
10
Issue
2
Year of publication
1998
Pages
389 - 399
Database
ISI
SICI code
0953-8984(1998)10:2<389:HLATDP>2.0.ZU;2-3
Abstract
Hysteresis loops of melt-spun Nd13Fe77B10 cooled down at the remanent state were measured at 4.2 K. The loop for fields of H-max = 6.4 MA m( -1) is characterized by low-and high-field steps. The loop for fields of H-max = 4.0 MA m(-1) is very thin with only a low-field step and is shifted profoundly along the H-axes. The loops and the spin distribut ion during the demagnetization process were analysed by micromagnetic finite-element calculations. Quantitatively, the calculations reproduc e the experimental loops fairly well. The spin distribution is fairly nonuniform, and a domain-wall-like distribution appears not only at so me grain boundaries but also within some grains at the high-field step . The demagnetization proceeds by nonuniform reversion as a whole, and neither the model of single-domain reversion nor the model of domain- wall pinning in the grain boundary model describes the process appropr iately.