Formation and magnetization reversal mechanisms of nano-size Fe arrays prepared on anodic aluminum oxide templates

THIN SOLID FILMS

卷:518

Article

Huang, Kai-Tze^2,3  Kuo, Po-Cheng²  Lin, Ger-Pin²  Shen, Chih-Lung²  Yao, Yeong-Der¹ 

[1] Fu Jen Catholic Univ, Inst Appl Sci & Engn, Taipei 24205, Taiwan

[2] Natl Taiwan Univ, Inst Mat Sci & Engn, Taipei 10617, Taiwan

[3] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

关键词: Anodic aluminum oxide;    Nanostructure array;    Scanning Electron Microscopy;    Magnetization reversal;    Magnetic Force Microscopy;    Magnetic storage media;   

DOI  :  10.1016/j.tsf.2010.04.020

来源: Elsevier

【 摘 要 】

Vertically aligned Fe arrays have been self-assembled on anodic aluminum oxide templates by evaporation. The rims of the pores, which act as obstacles to the stacking of atoms, prevent them from forming continuous films. By controlling the Fe nominal thicknesses (tau(n)) from 400 to 5 nm, the morphology is changed from continuous film to isolated arrays, leading to the change of the predominant magnetization reversal from domain wall motion to spin rotation. For samples with tau(n)<59 nm, isolated, rather than interconnected, morphology is formed. In this range, the coercivity shows a spectacular change for tau(n) = 47 nm, with an array diameter of about 52 nm, achieving a maximum of about 38 kA/m. The critical dimension of single-domain array is therefore determined. The magnetostatic and exchange interactions are reduced due to the thermal fluctuation, and the magnetization leaves from the in-plane direction to be randomly distributed in 3-D, for tau(n)<27 nm. (C) 2010 Elsevier B.V. All rights reserved.

【 授权许可】

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