This work introduces a material and method for high-volume, low-temperature, screen printing of self-biased magnetic films made from a composite of M-type strontium ferrite SrFe ₁₂ O ₁₉ (SrM) particles and polydimethylsiloxane (PDMS). The magnetic particles are aligned under a dc magnetic field, while the PDMS is cured at 75 °C, making this fabrication process compatible with semiconductor and printed-circuit-board substrates. Aligned composites with estimated SrM particle volume percentages of 14 vol.%, 20 vol.%, and 27 vol.% are fabricated, as well as an unaligned 14 vol.% composite for comparison. X-ray diffraction (XRD) and scanning electron microscopy (SEM) are used to examine the structure and composition of the composites. Furthermore, vibrating sample magnetometer and ferromagnetic resonance (FMR) measurements are performed to determine their dc and ac magnetic properties. Results show that the aligned composites have magnetic textures between 1.47 and 1.95, crystalline anisotropies between 1860 and 1960 kA/m, FMR frequencies of 45.5–45.9 GHz, and FMR linewidths between 3400 and 3500 Oe, indicating the potential for these materials in self-biased, non-reciprocal device applications. The analysis identifies that increased particle loading and better particle alignment may further improve these films by decreasing the linewidth.

中文翻译：

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用于集成磁性微波设备的丝网印刷、自偏置 SrM/PDMS 复合材料

这项工作介绍了一种材料和方法，用于大批量、低温、丝网印刷由 M 型锶铁氧体 SrFe ₁₂ O ₁₉复合材料制成的自偏磁膜 (SrM) 颗粒和聚二甲基硅氧烷 (PDMS)。磁性粒子在直流磁场下排列，而 PDMS 在 75°C 下固化，使这种制造工艺与半导体和印刷电路板基板兼容。制造了估计 SrM 颗粒体积百分比为 14 vol.%、20 vol.% 和 27 vol.% 的对齐复合材料，以及未对齐的 14 vol.% 复合材料用于比较。X 射线衍射 (XRD) 和扫描电子显微镜 (SEM) 用于检查复合材料的结构和组成。此外，还进行了振动样品磁力计和铁磁共振 (FMR) 测量，以确定它们的直流和交流磁特性。结果表明，取向复合材料的磁织构在 1.47 到 1.95 之间，结晶各向异性在 1860 到 1960 kA/m 之间，FMR 频率为 45.5-45.9 GHz，FMR 线宽在 3400 到 3500 Oe 之间，表明这些材料在自偏置、非互易设备应用中的潜力。分析表明，增加的颗粒负载和更好的颗粒排列可以通过减少线宽来进一步改善这些薄膜。