Magnetic properties and microstructures of multi-component Sm–Co-based films prepared by high-throughput experiments

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-07-27 DOI:10.1007/s12598-024-02902-7

Xin-Rui Zheng, Si-Zhe Liang, Zhao-Guo Qiu, Yan-Song Gong, Hong-Xia Meng, Gang Wang, Zhi-Gang Zheng, Wei-Xing Xia, De-Chang Zeng, Ping Liu

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Abstract

Sm–Co-based films play an irreplaceable role in special applications due to their high curie temperature and magnetocrystalline anisotropic energy, especially in heat-assisted magnetic recording (HAMR), but the complex composition of Sm–Co phase and unclear synergistic coupling mechanisms of multi-elemental doping become the challenges to enhance the properties. In this work, a novel strategy combining magnetron sputtering and a high-throughput experiment method is applied to solve the above-mentioned problems. Fe/Cu co-doping highly increases the remanence while maintaining a coercivity larger than 26 kOe, leading to an enhancement of the magnetic energy product to 18.1 MGOe. X-ray diffraction (XRD) and high-resolution transmission electron microscope (HRTEM) reveals that SmCo₅ phase occupies the major fraction, with Co atoms partially substituted by Fe and Cu atoms. In situ Lorentz transmission electron microscopy (LTEM) observations show that the Sm (Co, Cu)₅ phase effectively prohibits domain wall motions, leading to an increase of coercivity (H_c). Fe doping increases the low saturation magnetization (M_s) and low remanence (M_r) due to the Fe atom having a higher saturation magnetic moment. The magnetization reversal behaviors are further verified by micromagnetic simulations. Our results suggest that Sm–Co-based films prepared via Fe/Cu co-doping could be a promising candidate for high-performed HAMR in the future.

Graphical abstract

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通过高通量实验制备的多组分 Sm-Co 基薄膜的磁性能和微观结构

钐钴基薄膜具有高居里温度和磁晶各向异性能，在特殊应用中发挥着不可替代的作用，尤其是在热辅助磁记录（HAMR）中，但钐钴相成分复杂，多元素掺杂的协同耦合机制不明确，成为提高其性能的难题。本研究采用磁控溅射和高通量实验相结合的新策略解决了上述问题。在保持大于 26 kOe 的矫顽力的同时，铁/铜共掺杂极大地提高了剩磁，从而将磁能积提高到 18.1 MGOe。X 射线衍射（XRD）和高分辨率透射电子显微镜（HRTEM）显示，SmCo5 相占主要部分，钴原子部分被铁原子和铜原子取代。原位洛伦兹透射电子显微镜（LTEM）观察表明，Sm（Co，Cu）5 相有效地抑制了畴壁运动，从而提高了矫顽力（Hc）。由于铁原子具有较高的饱和磁矩，因此掺杂铁会增加低饱和磁化（Ms）和低剩磁（Mr）。微磁模拟进一步验证了磁化反转行为。我们的研究结果表明，通过铁/铜共掺杂制备的 Sm-Co 基薄膜有望成为未来高性能 HAMR 的候选材料。

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.