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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Influence of maghemite concentration on magnetic interactions in maghemite/PTT-block-PTMO nanocomposite
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Influence of maghemite concentration on magnetic interactions in maghemite/PTT-block-PTMO nanocomposite

机译：磁赤铁矿浓度对磁赤铁矿/ PTT-嵌段-PTMO纳米复合材料中磁性相互作用的影响

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摘要

Temperature dependence of dc magnetization and ferromagnetic resonance (FMR) of two samples containing gamma-Fe2O3 (maghemite) magnetic nanoparticles dispersed at low concentration (0.1 and 0.3 wt%) in a nanocomposite based on a poly(ether-ester) multiblock copolymer (PTT-block-PTMO) matrix was investigated. The polymer filler was in a powder form consisting of small-sized magnetic nanoparticles arranged in agglomerates 2-3 mu m long and 100 nm thick. The studied samples were characterized by SEM spectroscopy. The SEM showed that the concentration of magnetic nanoparticles was homogenous in both samples The temperature dependence of the dc magnetization revealed that the blocking was about 100 K and the ZFC (zero-field cooling) mode at low magnetic fields uncovered the presence of magnetic interactions between magnetic nanoparticles depending on the properties of the matrix. FMR measurements were carried out in the temperature range 4.2-300 K. An intense resonance absorption line attributed to gamma-Fe2O3 nanoparticles was recorded with a slightly asymmetric lineshape. At room temperature the resonance line was centered at H-r = 3241(2) and 3253(2) G, with linewidths of Delta H = 1069(1) and 1070(l) G for samples with concentrations of 0.1 and 0.3 wt%, respectively. All FMR parameters showed an anomalous behavior at matrix critical temperatures. it was shown that the difference in concentration of magnetic nanoparticles could be responsible for the observed differences in the thermal behavior of the FMR spectra. (C) 2008 Elsevier B.V. All rights reserved.
机译：包含以低浓度（0.1和0.3 wt％）分散在基于聚醚酯多嵌段共聚物（PTT）的纳米复合材料中的两个含γ-Fe2O3（磁铁矿）磁性纳米颗粒的样品的直流磁化强度和铁磁共振（FMR）的温度依赖性-block-PTMO）矩阵进行了研究。聚合物填料为粉末形式，由小尺寸的磁性纳米颗粒组成，这些纳米颗粒排列成2-3微米长，100纳米厚的团块。所研究的样品通过SEM光谱表征。扫描电镜显示两个样品中磁性纳米粒子的浓度均一。直流磁化强度的温度依赖性显示，阻塞约为100 K，并且在低磁场下的ZFC（零场冷却）模式揭示了两者之间存在磁性相互作用磁性纳米颗粒取决于基质的性质。 FMR测量在4.2-300 K的温度范围内进行。记录到归因于γ-Fe2O3纳米粒子的强烈共振吸收线，其线形略有不对称。在室温下，对于浓度分别为0.1和0.3 wt％的样品，共振线的中心位于Hr = 3241（2）和3253（2）G，线宽Delta H = 1069（1）和1070（l）G 。所有FMR参数在基质临界温度下均表现出异常行为。结果表明，磁性纳米粒子浓度的差异可能是造成FMR光谱热行为差异的原因。 （C）2008 Elsevier B.V.保留所有权利。

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