First-order-reversal-curve analysis of rare earth permanent magnet nanostructures: insight into the coercivity enhancement mechanism through regulating the Nd-rich phase,Inorganic Chemistry Frontiers

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First-order-reversal-curve analysis of rare earth permanent magnet nanostructures: insight into the coercivity enhancement mechanism through regulating the Nd-rich phase
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-11-13 , DOI: 10.1039/d0qi01108h
Junjie Xu _{1,

2,

3,

4,

5} , Kai Zhu _{1,

2,

3,

4,

5} , Wei Li _{1,

2,

3,

4,

5} , Xiaobai Wang _{1,

2,

3,

4,

5} , Ziyu Yang _{1,

2,

3,

4,

5} , Yanglong Hou _{1,

2,

3,

4,

5} , Song Gao _{4,

5,

6,

7}

Affiliation

Rare earth permanent magnet nanostructures have attracted intensive interest recently due to the increasing demand for integrated and miniaturized devices. As a typical example, hard magnetic Nd₂Fe₁₄B-based nanostructures with desired coercivity have been developed by a reduction–diffusion process and the Nd-rich phase is supposed to be essential to optimize the magnetic properties, whereas the identification and role of the Nd-rich phase have not been addressed so far. Herein, Nd₂Fe₁₄B-based nanostructures with different Nd-rich phase contents, Nd₁₅Fe₇₇B₈ and Nd_14.2Fe_78.6B_7.2, are rationally prepared by a reduction–diffusion process. The coercivity of Nd₁₅Fe₇₇B₈ can reach 5 kOe, which is higher than that of Nd_14.2Fe_78.6B_7.2 of 3.2 kOe. First-order-reversal-curve (FORC) analysis confirms the amorphous paramagnetic Nd-rich phase as pinning centers and reveals magnetic interactions and magnetic domain nature in the two nanostructures. The increase of the Nd-rich phase optimizes microstructures and magnetic interactions, responsible for higher coercivity. This work points out the relationship between the Nd-rich phase, magnetic interactions, microstructures, and magnetic properties, and could usher in new ways of fabricating advanced permanent magnetic nanostructures.

中文翻译：

稀土永磁体纳米结构的一阶反转曲线分析：通过调节富钕相提高矫顽力机理

由于对集成和小型化设备的需求不断增加，稀土永磁体纳米结构最近引起了广泛的关注。作为一个典型示例，通过还原扩散过程已开发出具有所需矫顽力的硬磁Nd ₂ Fe ₁₄ B基纳米结构，富Nd相对于优化磁性能至关重要，而Nd ₂ Fe ₁₄ B的识别和作用至关重要。迄今为止，富钕阶段尚未解决。在此，具有不同的富Nd相含量的Nd ₂ Fe ₁₄ B基纳米结构，Nd ₁₅ Fe ₇₇ B ₈和Nd _14.2 Fe _78.6 B _7.2通过减少扩散过程合理地准备。Nd ₁₅ Fe ₇₇ B ₈的矫顽力可以达到5 kOe，高于Nd _14.2 Fe _78.6 B _7.2的矫顽力。3.2 kOe。一阶反转曲线（FORC）分析确认非晶态顺磁性富Nd相为钉扎中心，并揭示了两个纳米结构中的磁相互作用和磁畴性质。富钕相的增加优化了微观结构和磁相互作用，从而提高了矫顽力。这项工作指出了富Nd相，磁相互作用，微观结构和磁性能之间的关系，并且可能会为制造先进的永磁纳米结构开辟新的途径。

更新日期：2020-12-17

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