Engineered Magnetic Shape Anisotropy in BiFeO3-CoFe2O4 Self-Assembled Thin Films

被引：71

作者：

Wang, Zhiguang ^{[1
]}

Li, Yanxi ^{[1
]}

Viswan, Ravindranath ^{[1
]}

Hu, Bolin ^{[2
]}

Harris, Vincent G. ^{[2
]}

Li, Jiefang ^{[1
]}

Viehland, Dwight ^{[1
]}

机构：

[1] Virginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA

[2] Northeastern Univ, Dept Elect & Comp Engn, Boston, MA 02115 USA

来源：

ACS NANO | 2013年 / 7卷 / 04期

关键词：

BiFeO3-CoFe2O4; self-assembled thin film; magnetic shape anisotropy; GRAIN-SIZE DEPENDENCE; ARRAYS; FIELD;

D O I：

10.1021/nn4003506

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report growth of various phase architectures of self-assembled BiFeO3-CoFe2(O4) (BFO-CFO) 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.

引用

页码：3447 / 3456

页数：10

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