Modelling of MFM images of 180° and 90° domain walls in iron films

Author

Huo, S. ; Sishop, J.E.L. ; Tucker, J.W. ; Rainforth, W.M. ; Davies, H.A.

Author_Institution

Centre for Adv. Magnetic Mater. & Device, Sheffield Univ., UK

Volume

33

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

4056

Lastpage

4058

Abstract

We report symmetric and antisymmetric 180° and 90° domain wall structures in (100) iron films obtained by micromagnetic computer simulation and the force gradients experienced by a pyramidal tip coated with thin CoCr film scanning them at 50 nm altitude. The magnetic force gradient was obtained numerically as the second difference of the interaction energy of the magnetic tip and the sample for small vertical displacements. The results showed that by using a magnetic force microscope (MFM), it is very difficult to distinguish (i) S and C type 180° domain walls in a thick iron film; and (ii) symmetric and asymmetric 90° Neel domain walls. However, S and C 180° domain walls can more readily be distinguished in thin magnetic films

Keywords

ferromagnetic materials; iron; magnetic domain walls; magnetic force microscopy; magnetic thin films; C type domain wall; CoCr; CoCr film; Fe; MFM imaging; Neel domain wall; S type domain wall; magnetic iron film; micromagnetic computer simulation; pyramidal tip; Anisotropic magnetoresistance; Demagnetization; Iron; Magnetic anisotropy; Magnetic domain walls; Magnetic domains; Magnetic force microscopy; Magnetic separation; Perpendicular magnetic anisotropy; Saturation magnetization;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.619661

Filename

619661