Multiresonance Microwave Absorption in Ti–Mn Substituted Barium Hexaferrite Composites

IF 1.1 4区物理与天体物理 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Magnetics Letters Pub Date : 2024-10-14 DOI:10.1109/LMAG.2024.3479936

M. J. Vazquez Bernardez;J. Solano;M. Bailleul;N. Vukadinovic;D. Stoeffler;C. Lefevre

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Abstract

Ti–Mn substituted Ba(TiMn) _x Fe _12-2x O ₁₉ hexaferrite randomly oriented composites were obtained by conventional ceramic synthesis. At zero applied magnetic field, in its polycrystalline powder form, this ferrimagnetic compound exhibits a multipeak permeability spectrum with two high-frequency resonances that converge under the action of an external magnetic field. We conduct a broad-band ferromagnetic resonances characterization of this system under an applied magnetic field between 0 and 2 T and integrate the results with micromagnetic simulations to investigate the presence of high-frequency resonating magnetic domains contingent upon the sample's microstructure. Simulations show that magnetic domains separated by domain walls upon each magnetic particle are responsible for the multipeak resonance in the Ka-band. By combining the simulated spectra with an effective medium theory accounting for the dilution effect of the dielectric matrix, we reproduce the zero-field permeability spectra.

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钛锰取代六价钡铁氧体复合材料中的多共振微波吸收

通过传统陶瓷合成法获得了钛锰取代的 Ba(TiMn)xFe12-2xO19 六价铁氧体无规取向复合材料。在零外加磁场条件下，这种多晶粉末状的铁磁化合物表现出多峰值磁导率谱，其中有两个高频共振，在外加磁场的作用下，这两个共振趋于一致。我们在 0 到 2 T 的外加磁场下对该系统进行了宽带铁磁共振表征，并将结果与微磁模拟相结合，以研究样品的微观结构是否存在高频共振磁畴。模拟结果表明，每个磁性粒子上被磁畴壁隔开的磁畴是产生 Ka 波段多峰共振的原因。通过将模拟光谱与有效介质理论（考虑到介质基体的稀释效应）相结合，我们再现了零场磁导率光谱。

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来源期刊

IEEE Magnetics Letters PHYSICS, APPLIED-

CiteScore

2.40

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0.00%

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期刊介绍： IEEE Magnetics Letters is a peer-reviewed, archival journal covering the physics and engineering of magnetism, magnetic materials, applied magnetics, design and application of magnetic devices, bio-magnetics, magneto-electronics, and spin electronics. IEEE Magnetics Letters publishes short, scholarly articles of substantial current interest. IEEE Magnetics Letters is a hybrid Open Access (OA) journal. For a fee, authors have the option making their articles freely available to all, including non-subscribers. OA articles are identified as Open Access.