Synergistic effect of lattice strain and Co doping on enhancing thermal stability in Fe16N2 thin film with high magnetization
Synergistic effect of lattice strain and Co doping on enhancing thermal stability in Fe16N2 thin film with high magnetization
复制标题
晶格应变和Co掺杂对增强高磁化Fe16N2薄膜热稳定性的协同作用
DOI：
10.1016/j.jmmm.2019.165873
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发表时间：
2020
影响因子：
2.7
通讯作者：
Yu Guang-Hua
中科院分区：
文献类型：
--
作者：
Wang Lei;Feng Chun;Cao Mi-Dan;Meng Fei;Li Yu-Kun;Yin Jian-Juan;Li Bao-He;Ogata Shigenobu;Geng Wen-Tong;Yu Guang-Hua
单相Fe16N2具有超高的饱和磁化强度和磁各向异性，是制造高性能磁写入头和永磁体的潜在材料。然而，相组成的可控性差和热稳定性差(在200 °C下分解)是其实际应用的一大障碍。在这项工作中，我们设计了一种新颖的Fe/Cr/FeN：Co异质结，同时引入晶格应变和Co掺杂，以调节FeN组分并协同提高相稳定性。通过有效的调节，FEN层在450 °C的温度下可以同时具有高的MS(2.4-2.8 T)和高的热稳定性。此外，通过第一性原理计算，我们发现对热稳定性的协同调节与Fe-N相的溶液热可调性密切相关。Fe/Cr/FeN：Co异质结可作为构造高效写头、永磁体和其他磁性器件的一种很有前途的材料。
Single phase Fe16N2is a potential material in building high-performance magnetic writing heads and permanent magnets due to its ultra-high saturation magnetization (MS) and magnetic anisotropy (Keff). However, the poor controllability of phase constituent and low thermostability (decomposed at 200 °C) are big obstacles to its practical applications. In this work, we have devised a novel Fe/Cr/FeN:Co heterostructure to introduce both lattice strain and Co doping for tuning the FeN constituent and enhancing the phase stability synergistically. With effective regulation, the FeN layer can possesse both superiorMS(2.4–2.8 T) and high thermostability with standing 450 °C annealing. Furthermore, by first-principles calculations, we reveal that the synergistic regulation on the thermostability is closely related to the solution heat tunability of Fe-N phases. The Fe/Cr/FeN:Co heterostructure may serve as a promising material for constructing high-efficient writing heads, permanent magnets, and other magnetic devices.