高性能La-Co共替代M型永磁铁氧体的磁各向异性增强机理研究进展

刘若水; 王利晨; 俞翔; 孙洋; 何诗悦; 赵同云; 沈保根

doi:10.7498/aps.73.20240190

摘要
自20世纪末以来，La-Co共替代的M型铁氧体备受关注，已成为高性能永磁铁氧体的基础材料。Co²⁺的未淬灭轨道矩被认为是增强铁氧体单轴各向异性的原因，但其微观作用机理尚未完全解释清楚。为了满足铁氧体材料日益增长的性能需求，理解其磁各向异性增强机理至关重要，并寻求从根源上的提升、低成本和高效的方法，以制定开发高性能产品的指导原则。本文综述了一系列研究工作，旨在确定Co离子在晶格中的取代位置，这是增强磁各向异性的关键。这些研究为进一步提高永磁铁氧体的磁性能提供了重要的材料设计参考。

关键词:
永磁铁氧体 /

La-Co共替代 /

磁晶各向异性 /

Co占位
Abstract
La-Co co-substituted M-type ferrite,first reported at the end of the 20th century,has garnered continuous attention from researchers worldwide,serving as the cornerstone for high-performance permanent magnet ferrites.The unquenched orbital moments of Co²⁺ play a pivotal role in enhancing the uniaxial anisotropy of M-type ferrites.However,a comprehensive understanding of its microscopic mechanism remains elusive.In response to the escalating performance demands of ferrite materials,elucidating the mechanism behind magnetic anisotropy enhancement becomes imperative,alongside the quest for guiding principles facilitating the swift and cost-effective development of high-performance products.but its mechanism at the microscopic level has not been explained.This review encompasses a comprehensive analysis of various studies aimed at pinpointing the crystal sites of Co substitution within the lattice.These investigations including neutron diffraction,nuclear magnetic resonance,and Mössbauer spectroscopy delve into the fundamental origins underlying the enhancement of magnetic anisotropy,thereby furnishing valuable insights for material design strategies geared towards further augmenting the magnetic properties of permanent magnet ferrites.The exploration of Co-substitution sites has yielded noteworthy findings.Through meticulous examination and analysis,researchers have discerned the intricate interplay between Co ions and the lattice structure,shedding light on the mechanisms governing magnetic anisotropy enhancement.The current mainstream view is that Co ions tend to occupy more than one site,namely the 4f₁,12k,and 2a sites,all of which are located within the spinel lattice.However,there have also been differing viewpoints,indicating that further exploration is needed to uncover the primary controlling factors influencing Co occupancy.Notably,the identification of specific Co substitution sites,especially the spin-down tetrahedron 4f₁,has enabled targeted modifications,culminating in the fine-tuning of magnetic properties with remarkable precision.Furthermore,the reviewed studies underscore the pivotal role of crystallographic engineering in tailoring the magnetic characteristics of ferrite materials.By strategically manipulating Co substitution,researchers have harnessed the intrinsic properties of the lattice to amplify magnetic anisotropy,thereby unlocking new avenues for the advancement of permanent magnet ferrites.In conclusion,the collective findings outlined in this review herald a promising trajectory for the field of permanent magnet ferrites.Armed with a nuanced understanding of Co-substitution mechanisms,researchers are poised to chart novel pathways toward the development of next-generation ferrite materials boasting enhanced magnetic properties.

Keywords:
permanent magnet ferrite /

La-Co substitution /

magnetocrystalline anisotropy /

Co occupancy
施引文献

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高性能La-Co共替代M型永磁铁氧体的磁各向异性增强机理研究进展

Progress of magnetic anisotropy enhancement mechanism in high-performance La-Co co-substituted M-type ferrites

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高性能La-Co共替代M型永磁铁氧体的磁各向异性增强机理研究进展

Progress of magnetic anisotropy enhancement mechanism in high-performance La-Co co-substituted M-type ferrites

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