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Synergistic Enhancement of Coercivity and Dielectric Performance in Al-Sm Co-Doped SrFe12O19 for High-Frequency Applications
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en
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11
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ECS Journal of Solid State Science and Technology, Volume 14, issue 10
Abstract
Magnetic nanomaterials with tunable dielectric and magnetic properties are essential for high-frequency applications. M-type strontium hexaferrites are widely used; however, their moderate magnetization, high dielectric loss, and limited tunability restrict broader usage. Prior studies employed single-ion doping to enhance individual properties, but often lacked simultaneous optimization of electrical and magnetic behavior. In this work, we introduce a novel Al-Sm co-doping strategy designed to simultaneously overcome these limitations by synergistically modifying dielectric and magnetic responses. The nominal composition SrAlxSmxFe12-2xO19 (x = 0.0-0.8) was synthesized using the sol-gel method and characterized by XRD, SEM, EDX, and FTIR. The electric and magnetic properties were systematically evaluated. Our results show that Al3+ effectively reduces dielectric loss and conductivity, while Sm3+ enhances magnetic anisotropy and coercivity. An optimal composition at x = 0.2 exhibits high coercivity (6805 Oe) and low dielectric loss, while the sample at x = 0.8 achieves a maximum dielectric constant (∼58) with minimal loss. These findings highlight, for the first time, that Al-Sm co-doping provides a dual improvement in dielectric and magnetic performance, surpassing previously reported single-doping approaches. The optimized compositions demonstrate strong potential for next-generation high-frequency and EMI absorption devices, underscoring the technological relevance of the proposed co-doping strategy.
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Publisher Copyright: © 2025 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.
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Irshad, A, Arif, D, Asghar, G, Safeen, A, Ali, B & Alam, M 2025, 'Synergistic Enhancement of Coercivity and Dielectric Performance in Al-Sm Co-Doped SrFe 12 O 19 for High-Frequency Applications', ECS Journal of Solid State Science and Technology, vol. 14, no. 10, 103001. https://doi.org/10.1149/2162-8777/ae09d9