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Broad distributions of relaxation times in FePt nanoparticles
journal contribution
posted on 2023-05-21, 14:26 authored by Rebecca FullerRebecca Fuller, Koutsantonis, GA, Stamps, RL, Bardou, FResults from magnetic viscosity experiments on chemically synthesized magnetic nanoparticles are presented. Our synthesized Fe20Pt80 particles are distinguished by a narrow size distribution but display features associated with broad distributions of activation rates. Results are presented from viscosity measurements in which the remnant magnetization is measured at different times after the removal of a static field, and studied as a function of temperature. We discuss how these results may be analyzed in terms of activation rate distributions for thermal activated reversal processes after the application and removal of a field. A method for the extraction of energy barrier distributions from directly measured time dependent data is presented.
History
Publication title
Journal of Applied PhysicsVolume
97Issue
10Article number
10J508Number
10J508Pagination
1-3ISSN
0021-8979Department/School
School of Natural SciencesPublisher
A I P Publishing LLCPlace of publication
United StatesRights statement
Copyright 2005 American Institute of PhysicsRepository Status
- Restricted