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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, F
Results 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 Physics

Volume

97

Issue

10

Article number

10J508

Number

10J508

Pagination

1-3

ISSN

0021-8979

Department/School

School of Natural Sciences

Publisher

A I P Publishing LLC

Place of publication

United States

Rights statement

Copyright 2005 American Institute of Physics

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the chemical sciences; Expanding knowledge in the physical sciences

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