Orientation dependence of the dynamic coercivity of Stoner-Wohlfarth particles

Authors
Citation
Jw. Harrell, Orientation dependence of the dynamic coercivity of Stoner-Wohlfarth particles, IEEE MAGNET, 37(1), 2001, pp. 533-537
Citations number
14
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
IEEE TRANSACTIONS ON MAGNETICS
ISSN journal
00189464 → ACNP
Volume
37
Issue
1
Year of publication
2001
Part
2
Pages
533 - 537
Database
ISI
SICI code
0018-9464(200101)37:1<533:ODOTDC>2.0.ZU;2-I
Abstract
The time dependence of the remanent coercivity for noninteracting Stoner-Wo hlfarth particles with uniaxial anisotropy has been calculated numerically as a function of easy axis angle and distribution width. The results have b een interpreted in terms of a simplified effective energy barrier function of the form DeltaE = CKV(1 - H/Ho)(n) and a modified Sharrock equation, For a system with identical easy axis angles, Sharrock law behavior occurs at all angles over a wide range of times with C = 1 and n a function of angle. For a distribution of easy axes, Sharrock law behavior also occurs with C = 1 and n approximate to 1.5 for squareness values ranging from random to a t least 0.98. The dependence of the energy barrier on field and easy axis a ngle is compared with the Victora expansion and with the Pfeiffer model.