Engineered Magnetic Shape Anisotropy in BiFeO3鈥揅oFe2O4 Self-Assembled Thin Films

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• 作者：Zhiguang Wang ; Yanxi Li ; Ravindranath Viswan ; Bolin Hu ; Vincent G. Harris ; Jiefang Li ; Dwight Viehland
• 刊名：ACS Nano
• 出版年：2013
• 出版时间：April 23, 2013
• 年：2013
• 卷：7
• 期：4
• 页码：3447-3456
• 全文大小：732K
• 年卷期：v.7,no.4(April 23, 2013)
• ISSN：1936-086X

文摘

We report growth of various phase architectures of self-assembled BiFeO₃鈥揅oFe₂O₄ (BFO鈥揅FO) thin films on differently oriented SrTiO₃ (STO) substrates. CFO forms segregated square, stripe, and triangular nanopillars embedded in a coherent BFO matrix on (001)-, (110)-, and (111)-oriented STO substrates, respectively. Nanostructures with an aspect ratio of up to 5:1 with a prominent magnetic anisotropy were obtained on both (001) and (110) STO along out-of-plane and in-plane directions. Magnetic easy axis rotation from in-plane to out-of-plane directions was realized through aspect ratio control. An intractable in-plane anisotropy was fixed in CFO on (111) STO due to the triangular shape of the ferromagnetic phase nanopillars. These studies established a detailed relationship of magnetic anisotropy with specific shape and dimensions of ordered magnetic arrays. The results suggest a way to effectively control the magnetic anisotropy in patterned ferromagnetic oxide arrays with tunable shape, aspect ratio, and elastic strain conditions of the nanostructures.

Keywords:

BiFeO₃鈭扖oFe₂O₄; self-assembled thin film; magnetic shape anisotropy