Ferromagnetic resonance investigations on styrene-butadiene-styrene barium ferrite nanocomposites.
Ferromagnetic resonance investigations on styrene-butadiene-styrene barium ferrite nanocomposites.
复制标题
苯乙烯-丁二烯-苯乙烯钡铁氧体纳米复合材料的铁磁共振研究。
DOI：
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发表时间：
2009
影响因子：
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通讯作者：
D. Sellmyer
中科院分区：
文献类型：
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作者：
N. All;M. Chipara;S. Balascuta;R. Skomski;D. Sellmyer
报道了分散在嵌段共聚物（苯乙烯-丁二烯-苯乙烯）中的钡铁氧体纳米颗粒（平均长度约 13 nm）的 FMR 测量结果。共振谱已通过戴森线和洛伦兹线的卷积成功模拟。报告了所谓面内和面外结构中 FMR 光谱的温度依赖性。详细分析了室温下 FMR 光谱的角度依赖性，并在简单的热力学模型中进行了模拟，该模型考虑了形状和磁晶各向异性之间的竞争。 FMR 数据表明，作用于非耦合电子自旋的局部磁场主要由磁晶贡献决定，最终包括表面效应。证明了 FMR 谱与磁滞回线之间的紧密联系。
FMR measurements on barium ferrite nanoparticles (with an average length of about 13 nm) dispersed within a block copolymer (styrene-butadiene-styrene) are reported. Resonance spectra have been successfully simulated by a convolution of a Dysonian line and a Lorentzian line. The temperature dependence of FMR spectra in the so called in-the-plane and out-of the-plane configurations is reported. The angular dependence of FMR spectra at room temperature is analyzed in detail and simulated within simple thermodynamic model that takes into account the competition between shape and magnetocrystalline anisotropies. FMR data revealed that the local magnetic field acting on uncoupled electronic spin is dominated by the magnetocrystalline contribution, which eventually includes surface effects. The strong connection between FMR spectra and hysteresis loop is demonstrated.