Formation of Magnetic Clusters in Perpendicular Thin Films

Author

Endo, H. ; Uesaka, Y. ; Nakatani, Y. ; Hayashi, N. ; Fukushima, H.

Author_Institution

Coll. of Eng., Nihon Univ., Fukushima

Volume

42

Issue

10

fYear

2006

Firstpage

2969

Lastpage

2971

Abstract

The formation and growing process of magnetic clusters in perpendicular thin films were investigated using micromagnetic simulation. Two estimation methods of cluster size were proposed. CS(area) was defined as the diameter of the circle which has the same area as the reversed region. CS(corr) was defined from the correlation between magnetizations of adjacent grains. These cluster sizes were calculated in the demagnetizing process. The shape of the cluster can be estimated from comparison between CS(area) and CS(corr). If CS(area) is larger than CS(corr), string shape clusters are formed. If CS(area) coincides with CS(corr), there are nonstring shape clusters. In order to make cluster size small in the demagnetizing process it is useful for the perpendicular thin film to have grain size dispersion

Keywords

magnetic thin films; magnetisation; micromagnetics; perpendicular magnetic recording; adjacent grains; demagnetizing process; grain size dispersion; magnetic cluster formation; magnetization correlation; micromagnetic simulation; nonstring shape clusters; perpendicular magnetic recording; perpendicular thin films; Demagnetization; Grain size; Magnetic anisotropy; Magnetic films; Micromagnetics; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Saturation magnetization; Shape; Transistors; Magnetic cluster; micromagnetic simulation; perpendicular magnetic recording;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2006.880075

Filename

1704499