Unveiling unsaturated modes from multi-frequency ferromagnetic resonance using maghemite nanoparticles

IF 2.8 3区物理与天体物理 Q2 PHYSICS, CONDENSED MATTER

Physica B-condensed Matter Pub Date : 2024-11-13 DOI:10.1016/j.physb.2024.416736

M.S. Pessoa , M.A. Sousa , P.S. Moscon , J.R.C. Proveti , L.C. Merino , P.C. Morais , F. Pelegrini , M. Parise , L.C. Figueiredo , E. Baggio-Saitovitch

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Abstract

This study reports on the use of ferromagnetic resonance (FMR), at various microwave frequencies (1.1 GHz, 3.5 GHz, 9.4 GHz, and 33.9 GHz), to investigate nanosized maghemite-based (γ-Fe₂O₃) samples in both powder (P) and aqueous-based magnetic fluid (MF) presentations. The structure of the as-synthesized sample was confirmed through x-ray diffraction (XRD), revealing the maghemite phase with average diameter of about 12 nm. Analyses of the room temperature (RT) FMR spectra suggest that the samples are in a non-saturated state for microwave frequencies below about 10 GHz (X-band). Comparisons between theoretical modelling (acceptable) parameters and those obtained through fittings of the experimental data revealed significant discrepancies, highlighting an increase in divergence as the measurement condition deviates from the magnetic saturation condition, taking place at microwave frequencies below about 10 GHz.

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利用方镁石纳米粒子揭示多频铁磁共振的不饱和模式

本研究报告了在不同的微波频率（1.1 GHz、3.5 GHz、9.4 GHz 和 33.9 GHz）下使用铁磁共振 (FMR) 研究粉末 (P) 和水基磁性流体 (MF) 两种形式的纳米级方镁石 (γ-Fe2O3)样品。通过 X 射线衍射 (XRD) 确认了合成样品的结构，显示出平均直径约为 12 纳米的菱镁矿相。对室温（RT）调频反射光谱的分析表明，样品在低于约 10 GHz（X 波段）的微波频率下处于非饱和状态。将理论建模（可接受）参数与通过实验数据拟合获得的参数进行比较，发现两者之间存在显著差异，这突出表明，当测量条件偏离磁饱和状态时，差异会增大，这发生在微波频率低于约 10 千兆赫时。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physica B-condensed Matter 物理-物理：凝聚态物理

CiteScore

4.90

自引率

7.10%

发文量

703

审稿时长

44 days

期刊介绍： Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work. Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas: -Magnetism -Materials physics -Nanostructures and nanomaterials -Optics and optical materials -Quantum materials -Semiconductors -Strongly correlated systems -Superconductivity -Surfaces and interfaces