Demagnetizing factors in patterned CoNiFe films with rectangular elements

doi:10.1088/1674-1056/22/5/056801

Abstract CoNiFe patterned films with rectangular elements, all 600 nm wide but of different lengths, were fabricated and investigated by ferromagnetic resonance experiment and micromagnetic simulation. An in-plane magnetic uniaxial anisotropy was exhibited, and its value increases with an increase in the aspect ratio of the elements, which was fitted by the model, including a quasi-ellipsoid demagnetizing field and a non-uniform demagnetizing field. The relative importance of the non-uniform demagnetizing field decreased from 0.26 to 0.16 with an increase in the length-width aspect ratio of the patterned element from 1.5 to 10. The demagnetizing factors in the three principal axes were determined from the experimental data of ferromagnetic resonance, which agreed reasonably well with the values calculated by micromagnetic simulation. The calculation also indicated that the interaction between elements could be neglected when the edge to edge spacing between neighboring elements was larger than 3 μ in our patterned films.

Keywords: patterned film shape anisotropy ferromagnetic resonance

Received: 18 September 2012
Revised: 07 November 2012
Accepted manuscript online:

PACS:	68.60.-p	(Physical properties of thin films, nonelectronic)
	75.30.Gw	(Magnetic anisotropy)
	75.50.+g

Fund: Project supported by the Postgraduates Innovation Program of Jiangsu Province, China (Grant No. CXZZ12-0086), the National Natural Science Foundation of China (Grant No. 11074034), the National Basic Research Program of China (Grant No. 2010CB923404), and the National Laboratory of Solid State Microstructures at Nanjing University and Southeast University, China.

Corresponding Authors: Zhang Dong, Zhai Ya
E-mail: physzd@yahoo.com; yazhai@seu.edu.cn

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Zhang Yu (章羽), Zhang Dong (张栋), Wang Yu-Kun (王昱坤), Yin Yu-Li (尹玉莉), Huang Zhao-Cong (黄兆聪), Luo Chen (罗琛), Zhai Ya (翟亚) Demagnetizing factors in patterned CoNiFe films with rectangular elements 2013 Chin. Phys. B 22 056801

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Demagnetizing factors in patterned CoNiFe films with rectangular elements

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