Moving Preisach model analysis of nanocrystalline SmFeCo
- Instituto de Fisica, Universidade de Sao Paulo, C.P. 66318, 05315-970 Sao Paulo, S.P. (Brazil)
- Instituto Elettrotecnico Nazionale Galileo Ferraris, C.M. d`Azeglio 42, I-10125 Torino (Italy)
Nanocrystalline SmFeCo, prepared by mechanically alloying the elementary powders and subsequent annealing (600{degree}C/15 min), showed remanence enhancement ({eta}=I{sub r}/I{sub s}=0.67) and H{sub c}=18.6 kOe. Starting from the ac-demagnetized state, minor hysteresis loops were determined for magnetic fields up to 70 kOe for numerical calculation of the Preisach function p(h{sub c},h{sub u}), where h{sub c} and h{sub u} are the elementary loop coercive field and interaction field. The numerically determined irreversible part of p(h{sub c},h{sub u}) had a form indicating that it could be factored: p{sub irr}(h{sub c},h{sub u})=f(h{sub c})g(h{sub u}), where f(h{sub c}) and g(h{sub u}) are log{endash}normal and Gaussian distributions. An analytic expression for p(h{sub c},h{sub u})=f(h{sub c})g(h{sub u})+p{sub rev} was fitted to experimental hysteresis curves. The analytic expression for p(h{sub c},h{sub u}) was used with the moving Preisach model to calculate minor loops and Henkel plots. Agreement between theory and experiment was very good. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 496606
- Report Number(s):
- CONF-961141-; ISSN 0021-8979; TRN: 97:016291
- Journal Information:
- Journal of Applied Physics, Vol. 81, Issue 8; Conference: 41. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 12-15 Nov 1996; Other Information: PBD: Apr 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Comparative Magnetic and Structural Properties Study of Micro- and Nanopowders of Nd{sub 2}Fe{sub 14}B Doped with Ni
High /sub i/H/sub c/ perpendicular anisotropy Nd-Fe-B sputtered films