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Qualitative insight and quantitative analysis of the effect of temperature on the coercivity of a magnetic system
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF. St. Petersburg State University, Russian Federation.
2016 (English)In: AIP Advances, ISSN 2158-3226, E-ISSN 2158-3226, Vol. 6, no 2, 025213Article in journal (Refereed) PublishedText
Abstract [en]

The temperature dependence of the response of a magnetic system to an applied field can be understood qualitatively by considering variations in the energy surface characterizing the system and estimated quantitatively with rate theory. In the system analysed here, Fe/Sm-Co spring magnet, the width of the hysteresis loop is reduced to a half when temperature is raised from 25 K to 300 K. This narrowing can be explained and reproduced quantitatively without invoking temperature dependence of model parameters as has typically been done in previous data analysis. The applied magnetic field lowers the energy barrier for reorientation of the magnetization but thermal activation brings the system over the barrier. A 2-dimensional representation of the energy surface is developed and used to gain insight into the transition mechanism and to demonstrate how the applied field alters the transition path. Our results show the importance of explicitly including the effect of thermal activation when interpreting experiments involving the manipulation of magnetic systems at finite temperature.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2016. Vol. 6, no 2, 025213
National Category
Condensed Matter Physics
URN: urn:nbn:se:kth:diva-184552DOI: 10.1063/1.4942428ISI: 000371739000064ScopusID: 2-s2.0-84959010744OAI: diva2:917280

QC 20160406

Available from: 2016-04-06 Created: 2016-04-01 Last updated: 2016-04-06Bibliographically approved

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Bessarab, Pavel F.
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