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Exchange Interactions and Curie Temperature of Ce-Substituted SmCo5

by Soyoung Jekal 1,2
1
Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
2
Condensed Matter Theory Group, Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland
Condens. Matter 2019, 4(1), 11; https://doi.org/10.3390/condmat4010011
Received: 13 December 2018 / Revised: 7 January 2019 / Accepted: 8 January 2019 / Published: 14 January 2019
A partial substitution such as Ce in SmCo 5 could be a brilliant way to improve the magnetic performance, because it will introduce strain in the structure and breaks the lattice symmetry in a way that enhances the contribution of the Co atoms to magnetocrystalline anisotropy. However, Ce substitutions, which are benefit to improve the magnetocrystalline anisotropy, are detrimental to enhance the Curie temperature ( T C ). With the requirements of wide operating temperature range of magnetic devices, it is important to quantitatively explore the relationship between the T C and ferromagnetic exchange energy. In this paper we show, based on mean-field approximation, artificial tensile strain in SmCo 5 induced by substitution leads to enhanced effective ferromagnetic exchange energy and T C , even though Ce atom itself reduces T C . View Full-Text
Keywords: mean-field theory; magnetism; exchange energy; curie temperature mean-field theory; magnetism; exchange energy; curie temperature
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Jekal, S. Exchange Interactions and Curie Temperature of Ce-Substituted SmCo5. Condens. Matter 2019, 4, 11.

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