Enhancement of Coercivity in α-Mn(Al) Magnetic Nanopowders Processed by High-Energy Ball Milling

IF 1.6 4区物理与天体物理 Q3 PHYSICS, APPLIED

Journal of Superconductivity and Novel Magnetism Pub Date : 2024-08-17 DOI:10.1007/s10948-024-06816-4

P. Saraswathi, S. Madeswaran, S. Subhavenkadesh, R. Ezhil Vizhi, D. Rajan Babu

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Abstract

We report the achievement of a high coercivity (Hc) value of 3 kOe for Mn₅₄Al₄₆ powders produced by high-energy ball milling without any heat treatment. The ferromagnetic α-Mn(Al) alloy powders were prepared with Mn (54 at%) and Al (46 at%) as the constituent metal elements. Analysis and discussion were held regarding the potential causes of the observed enhancement in the magnetic properties of the ball-milled powders in relation to their phase composition and microstructure. The process of milling causes partial solubilisation of Al atoms in the α-Mn phase and a change in the powder magnetic characteristics from paramagnetic to ferromagnetic. The existence of γ₂ and β phases was identified by XRD after long hours of the milling process. In addition, it was found that a longer milling time resulted in a smaller crystallite size, which also resulted in a decrease in magnetic saturation (Ms) but an increase in coercivity (H_C). Without applying any extra heat treatment, the Mn-Al powders milled for 6 h had optimum magnetic properties: Hc = 3.0 kOe, Mr = 0.05 emu/g, Ms = 0.19 emu/g, and (BH)max = 432 J/m³.

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高能球磨法加工的 α-锰（铝）磁性纳米粉体矫顽力的增强

我们报告了通过高能球磨法生产的 Mn54Al46 粉末在未进行任何热处理的情况下实现了 3 kOe 的高矫顽力 (Hc)。铁磁性α-Mn(Al)合金粉末是以锰(54%)和铝(46%)为组成金属元素制备的。分析和讨论了观察到的球磨粉末磁性增强的潜在原因与其相组成和微观结构的关系。研磨过程导致 Al 原子在 α-Mn 相中部分溶解，粉末磁性特征从顺磁性变为铁磁性。在长时间的研磨过程后，XRD 发现了 γ2 和 β 相的存在。此外，研磨时间越长，结晶尺寸越小，磁饱和度（Ms）降低，但矫顽力（HC）增加。在不进行任何额外热处理的情况下，研磨 6 小时的锰铝粉末具有最佳磁性能：Hc = 3.0 kOe，Mr = 0.05 emu/g，Ms = 0.19 emu/g，(BH)max = 432 J/m3。

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来源期刊

Journal of Superconductivity and Novel Magnetism 物理-物理：凝聚态物理

CiteScore

3.70

自引率

11.10%

发文量

342

审稿时长

3.5 months

期刊介绍： The Journal of Superconductivity and Novel Magnetism serves as the international forum for the most current research and ideas in these fields. This highly acclaimed journal publishes peer-reviewed original papers, conference proceedings and invited review articles that examine all aspects of the science and technology of superconductivity, including new materials, new mechanisms, basic and technological properties, new phenomena, and small- and large-scale applications. Novel magnetism, which is expanding rapidly, is also featured in the journal. The journal focuses on such areas as spintronics, magnetic semiconductors, properties of magnetic multilayers, magnetoresistive materials and structures, magnetic oxides, etc. Novel superconducting and magnetic materials are complex compounds, and the journal publishes articles related to all aspects their study, such as sample preparation, spectroscopy and transport properties as well as various applications.