Micromagnetic structures of recorded transitions in isotropic high-coercivity longitudinal thin films

Author

Cameron, Graham P. ; Judy, Jack H.

Author_Institution

Solid State Electron. Center, Honeywell Inc., Plymouth, MN, USA

Volume

29

Issue

6

fYear

1993

fDate

11/1/1993 12:00:00 AM

Firstpage

4177

Lastpage

4181

Abstract

A study of the micromagnetic structures of recorded transitions in isotropic longitudinal CoCr₁₂Ta₂/Cr thin films with coercivities between 240 and 1410 Oe is made directly through the Cr underlayer using Fresnel Lorentz transmission electron microscopy (FLTEM). Fourier transforms of digitized magnetic images are used to quantify the micromagnetic structures of the recorded transitions which are found to be dominated by magnetic vortex structures. Adjacent vortices are found to have alternating directions of magnetization rotation in contrast to zigzag or sawtooth transitions observed in conventional uniaxial thin film recording media with average transition lengths of 1.2 to 0.6 μm

Keywords

Fourier transforms; chromium; chromium alloys; cobalt alloys; coercive force; ferromagnetic properties of substances; magnetic heads; magnetic recording; magnetic thin film devices; magnetic thin films; magnetisation; tantalum alloys; transmission electron microscope examination of materials; CoCr₁₂Ta₂-Cr; CoCr₁₂Ta₂/Cr thin films; Fourier transforms; Fresnel Lorentz transmission electron microscopy; coercivities; digitized magnetic images; isotropic high-coercivity longitudinal thin films; magnetic heads; magnetic vortex structures; magnetization rotation; micromagnetic structures; recorded transitions; Chromium; Coercive force; Magnetic films; Magnetic recording; Micromagnetics; Radio frequency; Saturation magnetization; Sputtering; Transistors; Transmission electron microscopy;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.280865

Filename

280865