A. B. Drovosekov, N. M. Kreines, D. A. Ziganurov, A. V. Sitnikov, S. N. Nikolaev, V. V. Rylkov
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引用次数: 0
摘要
摘要 通过磁共振研究了金属-绝缘体纳米粒状复合材料 MxD100 - x 薄膜，其金属和介电相（M = Fe、Co、CoFeB；D = Al2O3、SiO2、LiNbO3；x ≈ 15-70 at %）的组成和比例各不相同，频率（f = 7-37 GHz）和温度（T = 4.2-360 K）范围很广。除了来自纳米颗粒阵列的常规铁磁共振信号外，实验光谱还包含一个额外的吸收峰，我们将其与分散在颗粒之间绝缘空间的铁离子和钴离子的电子顺磁共振（EPR）联系起来。与传统的铁离子和钴离子在弱掺杂的非磁性基质中的电子顺磁共振不同，观察到的峰值显示出许多不寻常的特性，我们将其解释为离子和颗粒之间存在磁性相互作用。
Specific Features of g ≈ 4.3 EPR Line Behavior in Magnetic Nanogranular Composites
Abstract
Films of metal-insulator nanogranular composites MxD100 –x with different composition and percentage of metal and dielectric phases (M = Fe, Co, CoFeB; D = Al2O3, SiO2, LiNbO3; x ≈ 15–70 at %) are investigated by magnetic resonance in a wide range of frequencies (f = 7–37 GHz) and temperatures (T = 4.2–360 K). In addition to the usual ferromagnetic resonance signal from an array of nanogranules, the experimental spectra contain an additional absorption peak, which we associate with the electron paramagnetic resonance (EPR) of Fe and Co ions dispersed in the insulating space between the granules. In contrast to the traditional EPR of Fe and Co ions in weakly doped non-magnetic matrices, the observed peak demonstrates a number of unusual properties, which we explain by the presence of magnetic interactions between ions and granules.
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Journal of Experimental and Theoretical Physics is one of the most influential physics research journals. Originally based on Russia, this international journal now welcomes manuscripts from all countries in the English or Russian language. It publishes original papers on fundamental theoretical and experimental research in all fields of physics: from solids and liquids to elementary particles and astrophysics.
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