Abstract
The study investigated the temperature dependence of the exchange-spring interaction in core–shell Co0.6Zn0.4Fe2O4 (core)/SrFe12O19 (shell) magnetic nanofibers. It was found that the squareness of the exchange-spring magnets, and thus the exchange-spring interaction, actually improved as the temperature decreased. The research found that the temperature trends of the soft phase exchange field (Hex) and the Bloch wall width of the hard phase (δh) are crucial in determining how the exchange-spring interaction functions under temperature changes. A competition between the temperature trends of Hex and δh was observed, where decreasing the temperature led to an increase in Hex (improving the exchange-spring interaction) and a decrease in δh (deteriorating the exchange-spring interaction). The study suggests that the Curie temperature (Tc) and the function of the temperature trend (τ) play vital roles in the rate of change of Hex and δh. Considering the Tc of the soft and hard phases and the τ of Hex and δh, it was observed that the rate of increase in Hex became greater than the rate of decrease in δh with decreasing temperature. Therefore, the study concludes that the exchange-spring interaction improved with a reduction in temperature.
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The authors express their gratitude to Isfahan University of Technology for their support of this project.
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Bina, M., Kameli, P. & Varzaneh, A.G. Temperature dependence of exchange-spring interaction in core–shell Co0.6Zn0.4Fe2O4/ SrFe12O19 magnetic nanofibers. Eur. Phys. J. Plus 139, 429 (2024). https://doi.org/10.1140/epjp/s13360-024-05217-9
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DOI: https://doi.org/10.1140/epjp/s13360-024-05217-9