高等学校化学学报

高等学校化学学报 ›› 2010, Vol. 31 ›› Issue (4): 653.

• 研究论文 • 上一篇    下一篇

γ′-Fe4N纳米晶薄膜的磁性及热稳定性研究

王丽丽1,2, 安涛1, 宋立军1, 王欣2, 宫杰1, 郑伟涛2   

  1. 1. 长春大学理学院, 长春 130022;
    2. 吉林大学材料科学与工程学院, 长春 130012
  • 收稿日期:2009-05-26 出版日期:2010-04-10 发布日期:2010-04-10
  • 通讯作者: 郑伟涛, 男, 博士, 教授, 博士生导师, 主要从事功能材料和薄膜材料方面的研究. E-mail: wtzheng@jlu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 50832001)资助.

Investigation on Magnetic Properties and Thermal Stability for Nanocrystalline γ′-Fe4N Thin Films

WANG Li-Li1,2, AN Tao1, SONG Li-Jun1, WANG Xin2, GONG Jie1, ZHENG Wei-Tao2*   

  1. 1. College of Science, Changchun University, Changchun 130022, China;
    2. College of Materials Science and Engineering, Jilin University, Changchun 130012, China
  • Received:2009-05-26 Online:2010-04-10 Published:2010-04-10
  • Contact: ZHENG Wei-Tao. E-mail: wtzheng@jlu.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 50832001)资助.

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摘要：

采用直流磁控溅射方法, 在Si(100) 单晶衬底上获得了γ′-Fe4N纳米晶薄膜样品. 将样品在真空中分别于300, 400, 500, 600, 700和800 ℃下进行热处理, 利用XRD, SEM和VSM等测试手段对样品的结构、形貌和磁性进行表征. 结果表明, 热处理温度在300～500 ℃时, 在γ′-Fe4N纳米晶粒的界面处形成了Fe8N包裹层, 600 ℃时, Fe8N包裹层转变为α-Fe, 当热处理温度≥700 ℃时, 样品全部转变为α-Fe. γ′-Fe4N薄膜样品在600 ℃以下温度热处理可保持其主相γ′-Fe4N的结构稳定, 而其软磁性能并未发生明显的减弱.

关键词: γ′-Fe4N薄膜; 结构; 磁性; 热稳定性

Abstract:

Nanocrystalline γ′-Fe4N thin films were synthesized on single crystal Si(100) substrate by facing target magnetron sputtering and were heat-treated in vacuum at different temperatures of 300, 400, 500, 600, 700 and 800 ℃ in order to investigate their thermal stability. The structure, morphology and magnetic properties were characterized using X-ray diffraction(XRD), scanning electron microscopy(SEM) and vibrating sample magnetometer(VSM), respectively. The results indicated that Fe8N capsule layer was formed at the interface of γ′-Fe4N grain between the heat-treating temperature of 300 and 500 ℃. At heat-treating temperature of 600 ℃, the Fe8N phase layer tended to decompose to the more stable phase α-Fe. The complete phase transformation from nanocrystalline γ′-Fe4N phase to α-Fe phase occurred at 700 ℃. The obvious changes of the structure and soft ferromagnetic properties were not found under the temperature of 600 ℃.

Key words: γ′-Fe4N thin film; Structure; Magnetic property; Thermal stability

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