Authors
WT Coffey, DSF Crothers, JL Dormann, Yu P Kalmykov, EC Kennedy, W Wernsdorfer
Publication date
1998/6/22
Journal
Physical review letters
Volume
80
Issue
25
Pages
5655
Publisher
American Physical Society
Description
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 Néel-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 Néel-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).
Total citations
Scholar articles
WT Coffey, DSF Crothers, JL Dormann, YP Kalmykov… - Physical review letters, 1998