Studies on Domain Structure of FeCoZr Films From MFM Image by Calculating the Surface Stray Field

Author

Ge Yin ; Yuanfu Lou ; Fu Zheng ; Zhenghua Li ; Dongping Wu ; Jianmin Bai ; Fulin Wei ; Dan Wei

Author_Institution

Key Lab. for Magn. & Magn. Mater. of the Minist. of Educ., Lanzhou Univ., Lanzhou, China

Volume

49

Issue

7

fYear

2013

fDate

Jul-13

Firstpage

3553

Lastpage

3556

Abstract

Magnetic force microscopy (MFM) image is directly related to the field derivative distribution above the sample. It is necessary to find the real domain structure of the sample from the MFM image. In this work, the magnetic pole or charge distribution at the sample surface is calculated by deconvoluting the MFM image using the tip´s Green function. The Fourier transform of the magnetic potential in the 3-D space above the sample surface can be derived from the Fourier transform of the surface charge distribution. Thus the stray field distribution of sample can be obtained since it is the gradient of the magnetic potential. Based on the stray field distribution and the magnetic properties of the sample, we can analyze the magnetic domain structure. As an example, the domain structure of FeCoZr film is studied.

Keywords

Fourier transforms; Green´s function methods; chromium alloys; cobalt alloys; iron alloys; magnetic domain walls; magnetic force microscopy; magnetic structure; magnetic thin films; magnetisation; surface magnetism; 3-D space magnetic potential; Bloch wall structure; FeCoZr; Fourier transforms; Green´s function method; MFM image; magnetic domain structure; magnetic films; magnetic force microscopy image; magnetic pole; magnetic properties; magnetization; surface charge distribution; surface stray field distribution; Magnetic domain walls; Magnetic domains; Magnetic resonance imaging; Magnetometers; Perpendicular magnetic anisotropy; Soft magnetic materials; Discrete Fourier transformation; magnetic domain; magnetic force microscopy (MFM); stray field;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2013.2240661

Filename

6559117