Study of noise sources in thin film media

Author

Zhu, Jian-Gang ; Bertram, Neal H.

Author_Institution

California Univ., San Diego, La Jolla, CA, USA

Volume

26

Issue

5

fYear

1990

fDate

9/1/1990 12:00:00 AM

Firstpage

2140

Lastpage

2142

Abstract

The noise behavior of planar isotropic thin-film media is studied by examining magnetization configurations as well as pole-density distributions. Magnetization configurations at the remanent coercive state and in transitions are simulated by a micromagnetic model. The magnetic pole-density distributions are studied for films with and without intergranular exchange coupling. It is found that the magnetic poles form clusters and concentrate mainly near magnetization vortices and flux saddle points. In films with intergranular exchange coupling, large position fluctuations of the magnetization vortices and the flux saddle points results in large fluctuations of the pole-density distributions. The DC-erase noise in the remanent coercive state and the transition noise are higher in an exchange-coupled medium than in a film without intergranular exchange coupling

Keywords

coercive force; exchange interactions (electron); magnetic recording; magnetic thin films; magnetisation; noise; remanence; DC-erase noise; clusters; flux saddle points; intergranular exchange coupling; magnetic pole-density distributions; magnetization configurations; magnetization vortices; micromagnetic model; noise sources; pole-density distributions; remanent coercive state; thin film media; transition noise; Couplings; Grain boundaries; Magnetic anisotropy; Magnetic films; Magnetic flux; Magnetic noise; Magnetic separation; Perpendicular magnetic anisotropy; Saturation magnetization; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.104647

Filename

104647