Fe2P 型过渡金属基合金的室温磁各向异性,Journal of Alloys and Compounds

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Fe2P 型过渡金属基合金的室温磁各向异性
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2019-09-01 , DOI: 10.1016/j.jallcom.2019.05.327
F. Guillou , Sun-Liting , O. Haschuluu , Z.Q. Ou , E. Brück , O. Tegus , H. Yibole

摘要我们探索了源自六方 Fe2P 的四元材料的晶体结构和磁性能，六方 Fe2P 是一种已知具有特别大的磁晶各向异性的铁二元材料，可能对永磁体感兴趣，但不幸的是居里温度对于应用来说太低了。在 Fe2-zCozP1-xBx 和 Fe2-zCozP1-ySiy 四元组中同时使用金属和准金属取代，我们发现可以将居里温度提高到至少 640 K，同时保持 ac 轴单轴磁晶各向异性，从而产生可观的磁各向异性在室温下。在 Fe2-zCozP1-xBx 中，虽然硼适合提高居里温度，但其数量有限，因为它也有利于第二相的形成。与 Fe2-zCozP 或 Fe2P1-ySiy 三元相图的预期相反，发现 Fe2-zCozP1-ySiy 中同时 Co 取代 Fe 和 Si 取代 P 显着扩大了 Fe2P 型晶体的稳定性范围结构体。在磁场中取向的粉末上的 X 射线衍射图表明 ac 轴单轴磁各向异性。发现适当的热处理和轻微的金属缺陷适用于限制金属：准金属比为 3:1 的不需要的第二相的形成。结果，制备了几乎单相的 Fe1.95-zCozP1-ySiy 材料，并在室温下表现出可观的磁各向异性，K1 高达约 0.93 MJm-3。

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Room temperature magnetic anisotropy in Fe2P-type transition metal based alloys

Abstract We explore the crystal structure and magnetic properties of quaternary materials deriving from the hexagonal Fe2P, an iron binary known to present a particularly large magnetocrystalline anisotropy potentially interesting for permanent magnets, but with unfortunately a Curie temperature far too low for applications. Using simultaneous metal and metalloid substitutions in Fe2-zCozP1-xBx and Fe2-zCozP1-ySiy quaternaries, we found it is possible to increase the Curie temperature up to at least 640 K while maintaining a c axis uniaxial magnetocrystalline anisotropy, leading to an appreciable magnetic anisotropy at room temperature. In Fe2-zCozP1-xBx, though boron is appropriate to increase the Curie temperature, its amount is limited as it also favors the formation of secondary phases. Contrary to what could be anticipated from the phase diagrams of Fe2-zCozP or Fe2P1-ySiy ternaries, simultaneous Co for Fe and Si for P substitutions in Fe2-zCozP1-ySiy are found to significantly expand the range of stability of the Fe2P-type crystal structure. X-ray diffraction patterns on powders oriented in magnetic field indicate a c axis uniaxial magnetic anisotropy. Appropriate heat-treatments and slight metal deficiency are found suitable to limit the formation of unwanted secondary phase with 3:1 metal:metalloid ratio. As a result, nearly single-phase Fe1.95-zCozP1-ySiy materials are prepared and exhibit an appreciable magnetic anisotropy with K1 up to approximately 0.93 MJm−3 at room temperature. This study experimentally demonstrates that Fe2P-type transition metal quaternaries can present an interest not only for their first-order magnetic transition, but also for their magnetic anisotropy making them potential candidates for magnetostatic applications.

更新日期：2019-09-01

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