Manipulation of the magnetic exchange interaction in SmCo films with high thermal stability by controlling phase transformation
Manipulation of the magnetic exchange interaction in SmCo films with high thermal stability by controlling phase transformation
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DOI：
10.1007/s00339-011-6619-2
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
C. Feng;Ning Li;Shuai-jie Li;Q. Huo;Minghua Li;Q. Zhan;Baohe Li;Jinhua Yin;Yong Jiang
中科院分区：
文献类型：
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作者：
C. Feng;Ning Li;Shuai-jie Li;Q. Huo;Minghua Li;Q. Zhan;Baohe Li;Jinhua Yin;Yong Jiang
SmCo材料的高热稳定性和可调谐的磁交换相互作用一直是磁记录介质和纳米复合永磁体应用的关键问题。通过适当增加Sm的浓度(20.5-37.7at.%)和控制退火工艺来控制相变，得到了热稳定性好、MEI可调的SmCo薄膜。微观结构研究表明，SmCo5相的存在保证了薄膜具有较高的热稳定性。此外，我们还用非磁性析出的SmCo2粒子在SmCo5粒子附近操纵了薄膜中的MEI。这些结果为在保持高热稳定性的同时调节SmCo材料中的MEI提供了一种新的方法。
High thermal stability and tunable magnetic exchange interaction (MEI) in SmCo materials have been the critical problem in applications to magnetic recording media and nanocomposite permanent magnets. We constructed SmCo films with a high thermal stability and tunable MEI by controlling the phase transformation through properly increasing the Sm concentration (20.5–37.7 at.%) and controlling the annealing process. Microstructure studies show that the SmCo5phases ensure that the film has a high thermal stability. Moreover, we manipulated the MEI in the film with non-magnetic precipitated SmCo2particles in the vicinity of SmCo5particles. These results provide a novel way to tune the MEI in SmCo materials while maintaining a high thermal stability.