Thermally activated relaxation time of a single domain ferromagnetic particle subjected to a uniform field at an oblique angle to the easy axis: Comparison with experimental observations
File Type:
PDFItem Type:
Journal ArticleDate:
1998Citation:
Coffey, W.T., Crothers, D.S.F., Dormann, J.L., Kalmykov, Yu.P., Kennedy, E.C., Wernsdorfer, W. 'Thermally activated relaxation time of a single domain ferromagnetic particle subjected to a uniform field at an oblique angle to the easy axis: Comparison with experimental observations' in Physical Review Letters, 80, 25, (1998), pp 5655 - 5658Download Item:
Abstract:
New asymptotes of the relaxation time of the magnetic moment of a single domain particle with a uniform magnetic field applied at an oblique angle to the easy axis (in excellent agreement with exact numerical results from the Fokker-Planck equation for the Neel-Brown model) are used to model the experimental angular variation of the switching field for individual Co and BaFeCoTiO particles. Good agreement is obtained, justifying the Neel-Brown (in effect, the Kramers) conception of the superparamagnetic relaxation process and allowing one to deduce the value of the damping constant (hitherto almost unknown).
Sponsor
Grant Number
Enterprise Ireland
Author's Homepage:
http://people.tcd.ie/wcoffeyDescription:
PUBLISHEDPublisher:
American Physical SocietyType of material:
Journal ArticleSeries/Report no:
Physical Review Letters80
25
Availability:
Full text availableKeywords:
Electronic & Electrical EngineeringMetadata
Show full item recordLicences: