The relationship between the dynamic remanent coercivity and the viscosityand irreversible susceptibility in magnetic media

Citation
Sm. Stinnett et al., The relationship between the dynamic remanent coercivity and the viscosityand irreversible susceptibility in magnetic media, IEEE MAGNET, 36(1), 2000, pp. 148-153
Citations number
25
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
IEEE TRANSACTIONS ON MAGNETICS
ISSN journal
00189464 → ACNP
Volume
36
Issue
1
Year of publication
2000
Part
1
Pages
148 - 153
Database
ISI
SICI code
0018-9464(200001)36:1<148:TRBTDR>2.0.ZU;2-D
Abstract
It has been established previously that thermal switching in high density m agnetic media causes a significant time dependence of the coercivity at lea st for times > 10(-8) s, Here, the classical Arrhenius-Neel model assuming coherent rotation is applied to systems with distributions in volume, aniso tropy and orientation and the numerical results for the time dependent rema nent coercivity H-CR(t), the viscosity SR, and the irreversible susceptibil ity, chi(IRR) compared to new experimental data on CrO2 particulate tapes w ith varying orientation. The results for an anisotropy distribution are sig nificantly different from a volume distribution and are in better agreement with the data. All distributions produce Sharrock type behavior for H-CR(t ), regardless of the distribution width. The model predicts that increasing the orientation distribution width will have very little effect on the fra ctional time dependence of N-CR, in agreement with experiment which showed that S-R/chi(IRR) and HCR(t) were essentially independent of orientation. F inally, the direct connection between S-R/chi(IRR) and N-CR(t) is confirmed theoretically and experimentally.