Structural and magnetic properties of ultra-thin Fe films on metal-organic chemical vapour deposited GaN(0001)
Structural and magnetic properties of ultra-thin Fe films on metal-organic chemical vapour deposited GaN(0001)
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DOI：
10.1063/1.4973956
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发表时间：
2017-01
影响因子：
3.2
通讯作者：
Jun-young Kim;A. Ionescu;R. Mansell;I. Farrer;F. Oehler;C. Kinane;J. Cooper;N. Steinke;S. Langridge;R. Stankiewicz;C. Humphreys;R. Cowburn;S. Holmes;C. Barnes
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文献类型：
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作者：
Jun-young Kim;A. Ionescu;R. Mansell;I. Farrer;F. Oehler;C. Kinane;J. Cooper;N. Steinke;S. Langridge;R. Stankiewicz;C. Humphreys;R. Cowburn;S. Holmes;C. Barnes
研究了GaN（0001）衬底上1-10 nm厚Fe薄膜的结构和磁性。原位反射高能电子衍射图像表明α-Fe（110）/GaN（0001）生长为三维Volmer-Weber型。α-Fe（110）X射线衍射峰半高宽为1°，晶粒尺寸约为20 nm。一个显着减少Fe原子矩从它的体积值，观察薄膜薄于4 nm。GaN/Fe界面粗糙度和Fe膜的结晶度都随着Fe厚度的增加而增加，表明Fe的结晶质量可能会变差。磁各向异性主要是单轴的所有薄膜，而六方各向异性出现的厚度大于3.7 nm。
Structural and magnetic properties of 1–10 nm thick Fe films deposited on GaN(0001) were investigated. In-situ reflecting high energy electron diffraction images indicated a α-Fe(110)/GaN(0001) growth of the 3D Volmer-Weber type. The α-Fe(110) X-ray diffraction peak showed a 1° full-width at half-maximum, indicating ≈20 nm grain sizes. A significant reduction in Fe atomic moment from its bulk value was observed for films thinner than 4 nm. Both GaN/Fe interface roughness and Fe film coercivity increased with Fe thickness, indicating a possible deterioration of Fe crystalline quality. Magnetic anisotropy was mainly uniaxial for all films while hexagonal anisotropies appeared for thicknesses higher than 3.7 nm.