Volume 41, Number 2, January II 1998
|Page(s)||219 - 224|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Possible determination of critical exponents from experimental magnetization data of ferromagnetic thin films
Institut für Experimentalphysik, Freie Universität Berlin, D-14195 Berlin,
Accepted: 20 November 1997
The influence of finite-size effects on the determination of the critical exponent of the magnetization β is critically discussed. We show that the usual fitting procedure, of fitting a power law to experimental data, is not correct for finite-size disturbed data and only accidentally results in nearly correct values for the critical exponent. The critical temperature resulting from a fit procedure is always too high, because the fitting range includes finite-size disturbed data. A new method is proposed, which circumvents the problems arising in fitting a power law to the experimental magnetization data. This method uses an effective critical exponent and allows the determination of β and Tc even from finite-size disturbed data. The method will be reliable for evaluating experimental data in the currently interesting field of confined magnetic films.
PACS: 75.70.Ak – Magnetic properties of monolayers and thin films / 75.40.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) / 75.40.Mg – Numerical simulation studies
© EDP Sciences, 1998
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.