Thermal-vacancy-assisted phase transition in FePt thin films
Thermal-vacancy-assisted phase transition in FePt thin films
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DOI：
10.1063/1.3575558
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发表时间：
2011-04
影响因子：
4
通讯作者：
Xiujin Li;Fengqin Wang;B. Liu;D. Guo;X. Zhang
中科院分区：
文献类型：
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作者：
Xiujin Li;Fengqin Wang;B. Liu;D. Guo;X. Zhang
了解FePt薄膜从A1结构到L10结构的有序转变对开发L10-FePt薄膜作为超高密度磁记录介质具有重要意义。本文研究了基于活化体积测量的FePt薄膜的l10有序转变。在l10阶跃迁中，原子扩散具有较大的活化体积ΔV∗= 10-11 A3=(0.75-0.8) Ω，其中Ω为FePt的平均原子体积，表明其为热空位辅助相变。这种转变被认为主要依赖于铁原子的扩散。这些发现对低温下制备L10-FePt薄膜和优化其微观结构具有直接意义。
Understanding the ordering transition from A1 to L10 structure in FePt thin films is of great significance for developing L10-FePt films as ultrahigh density magnetic recording media. Here, the L10-ordering transition of FePt films has been investigated based on activation volume measurements. A large activation volume ΔV∗=10–11 A3=(0.75–0.8) Ω, where Ω is average atomic volume of FePt, is determined for atomic diffusions in the L10-ordering transition, indicating a thermal-vacancy-assisted phase transition. This transition is suggested to be predominantly dependent on the diffusion of Fe atoms. These findings have direct implications for yielding L10-FePt films at low temperatures and optimizing their microstructures.