Qualitative insight and quantitative analysis of the effect of temperature on the coercivity of a magnetic system

Mariia Moskalenko; Pavel F. Bessarab; Valery M. Uzdin; Hannes Jónsson

doi:10.1063/1.4942428

Qualitative insight and quantitative analysis of the effect of temperature on the coercivity of a magnetic system

Mariia Moskalenko, Pavel F. Bessarab, Valery M. Uzdin, Hannes Jónsson

University of Iceland

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Article number	025213
Journal	AIP Advances
Volume	6
Issue number	2
DOIs	https://doi.org/10.1063/1.4942428
Publication status	Published - 1 Feb 2016

Bibliographical note

Funding Information: This work was supported by the University of Iceland Doctoral Scholarship and Research Funds, the Russian Foundation of Basic Research (Grants No. 14-02-00102, and No. 14-22-01113 ofi-m), the Icelandic Research Fund, the Academy of Finland (grant 278260), and by the Nordic-Russian Training Network for Magnetic Nanotechnology (NCM-RU10121). PB gratefully acknowledges support from the G?ran Gustafsson Foundation. We thank Eric Fullerton for helpful discussions. Publisher Copyright: © 2016 Author(s).

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title = "Qualitative insight and quantitative analysis of the effect of temperature on the coercivity of a magnetic system",

abstract = "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.",

author = "Mariia Moskalenko and Bessarab, \{Pavel F.\} and Uzdin, \{Valery M.\} and Hannes J{\'o}nsson",

note = "Funding Information: This work was supported by the University of Iceland Doctoral Scholarship and Research Funds, the Russian Foundation of Basic Research (Grants No. 14-02-00102, and No. 14-22-01113 ofi-m), the Icelandic Research Fund, the Academy of Finland (grant 278260), and by the Nordic-Russian Training Network for Magnetic Nanotechnology (NCM-RU10121). PB gratefully acknowledges support from the G?ran Gustafsson Foundation. We thank Eric Fullerton for helpful discussions. Publisher Copyright: {\textcopyright} 2016 Author(s).",

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AU - Jónsson, Hannes

N1 - Funding Information: This work was supported by the University of Iceland Doctoral Scholarship and Research Funds, the Russian Foundation of Basic Research (Grants No. 14-02-00102, and No. 14-22-01113 ofi-m), the Icelandic Research Fund, the Academy of Finland (grant 278260), and by the Nordic-Russian Training Network for Magnetic Nanotechnology (NCM-RU10121). PB gratefully acknowledges support from the G?ran Gustafsson Foundation. We thank Eric Fullerton for helpful discussions. Publisher Copyright: © 2016 Author(s).

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N2 - 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.

AB - 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.

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Qualitative insight and quantitative analysis of the effect of temperature on the coercivity of a magnetic system

Abstract

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