Correlations of magnetic microstructure and anisotropy with noise spectra for CoNi and CoCrTa thin film media

Author

Khan, Mahbub R. ; Lee, S.Y. ; Pressesky, J.L. ; Williams, D. ; Duan, S.L. ; Fisher, R.D. ; Heiman, Neil ; Scheinfein, M.R. ; Unguris, J. ; Pierce, D.T. ; Celotta, R.J. ; Speliotis, Dennis E.

Author_Institution

Seagate Magnetics, Fremont, CA, USA

Volume

26

Issue

5

fYear

1990

fDate

9/1/1990 12:00:00 AM

Firstpage

2715

Lastpage

2717

Abstract

The authors report on two thin-film-media alloys, Co₈₆Cr₁₂Ta₂ and Co₇₅Ni₂₅, which have very different noise characteristics. The magnetic microstructure of these films was observed with SEMPA (scanning electron microscopy with polarization analysis). Anisotropy and rotational hysteresis loss measurements have been made using a torque magnetometer. The distribution of anisotropy field H _k and its width dH_k have also been measured along with its different normalized values. It is suggested that the observed magnetic microstructure can be directly correlated with measured readback noise and anisotropy differences

Keywords

chromium alloys; cobalt alloys; ferromagnetic properties of substances; magnetic anisotropy; magnetic hysteresis; magnetic structure; magnetic thin films; metallic thin films; nickel alloys; noise; scanning electron microscope examination of materials; tantalum alloys; Co₇₅Ni₂₅; Co₈₆Cr₁₂Ta₂; anisotropy; magnetic microstructure; noise spectra; readback noise; rotational hysteresis loss; scanning electron microscopy with polarization analysis; Anisotropic magnetoresistance; Chromium alloys; Cobalt alloys; Electrons; Magnetic field measurement; Magnetic films; Magnetic force microscopy; Magnetic noise; Micromagnetics; Nickel alloys;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.104848

Filename

104848