Tip Interface Exchange-Coupling Based on "Bi-Anisotropic" Nanocomposites with Low Rare-Earth Content
Tip Interface Exchange-Coupling Based on "Bi-Anisotropic" Nanocomposites with Low Rare-Earth Content
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基于低稀土含量“双各向异性”纳米复合材料的尖端界面交换耦合
DOI：
10.1021/acsami.0c21669
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发表时间：
2021
影响因子：
9.5
通讯作者：
Wang Yatao
中科院分区：
文献类型：
--
作者：
Wu Qiong;Ma Xiangyu;Yue Ming;Cong Liying;Ma Zhenhui;Zhang Dongtao;Li Yuqing;Wang Yatao
采用自下而上的方法制备了SmCo 5/Co磁性纳米复合材料。首先采用液相化学合成结合还原退火法制备SmCo 5纳米芯片，然后化学沉积Co纳米棒进行包覆。SmCo 5纳米片和Co纳米棒均具有各向异性，在外加磁场作用下可以同时取向.应用于这些“双各向异性”SmCo 5/Co复合材料的磁性测量显示出高的磁性能与Co相含量在很宽的范围从10到80重量%。有史以来第一次，实现了适用的交换耦合纳米复合材料与稀土含量低于7重量%，表现出接近10 kOe的矫顽力和剩磁31%以上的单相SmCo 5。通过三维微磁学模拟，揭示了在SmCo 5表面与针尖界面交换耦合作用下，Co相的反转机制从非相干模式转变为相干模式.
Specially designed SmCo5/Co magnetic nanocomposites have been fabricated by a “bottom up” process. SmCo5nanochips were first prepared by solution-phase chemical synthesis combined with reductive annealing and then coated by chemical deposition of Co nanorods. Both the SmCo5nanochips and Co nanorods are anisotropic and could be simultaneously aligned under the external magnetic field. Magnetic measurements applied on these “bi-anisotropic” SmCo5/Co composites show high magnetic performance with the Co phase content in a wide range from 10 to 80 wt %. For the first time ever, the applicable exchange-coupled nanocomposites with a rare-earth content lower than 7 wt % was realized, which exhibits the coercivity close to 10 kOe and remanence 31% larger than that of single phase SmCo5. 3-D micromagnetic simulations were performed to reveal that the reversal mechanism in the Co phase was transferred from the incoherent mode to the coherent mode under a tip interface exchange-coupling with a SmCo5surface.