Epitaxial ferromagnetic nanoislands of cubic GdN in hexagonal GaN
Epitaxial ferromagnetic nanoislands of cubic GdN in hexagonal GaN
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DOI：
10.1063/1.3702843
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发表时间：
2012-02
影响因子：
4
通讯作者：
T. Kent;J. Yang;L. Yang;M. Mills;R. Myers
中科院分区：
文献类型：
--
作者：
T. Kent;J. Yang;L. Yang;M. Mills;R. Myers
采用等离子体辅助分子束外延技术在单晶GaN基体中制备了周期结构的GdN颗粒。高分辨率X射线衍射表明，GdN岛，与岩盐结构的纤锌矿GaN基体外延取向。扫描透射电子显微镜结合原位反射高能电子衍射允许岛的形成动力学，发生后1.2单层的GdN覆盖的研究。磁性揭示了两个铁磁相，一个是由于GdN颗粒的居里温度为70 K和第二，异常高于室温相。
Periodic structures of GdN particles encapsulated in a single crystalline GaN matrix were prepared by plasma assisted molecular beam epitaxy. High resolution x-ray diffractometery shows that GdN islands, with rock salt structure are epitaxially oriented to the wurtzite GaN matrix. Scanning transmission electron microscopy combined with in situ reflection high energy electron diffraction allows for the study of island formation dynamics, which occurs after 1.2 monolayers of GdN coverage. Magnetometry reveals two ferromagnetic phases, one due to GdN particles with Curie temperature of 70 K and a second, anomalous above room temperature phase.