DC erasure and demagnetizing fields on written bits in high density longitudinal media

Author

Abarra, E.N. ; Phillips, G.N. ; Okamoto, I. ; Suzuki, T.

Author_Institution

Toyota Technol. Inst., Nagoya, Japan

Volume

34

Issue

4

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

1621

Lastpage

1623

Abstract

The DC erasure process in a CoCrTa medium used for 0.8 Gbit/in² recording is investigated and compared with a CoCrPtTa medium capable of supporting 5 Gbit/in². All-ones patterns up to 250 kfci were imaged in the remanent state after the application of in situ magnetic fields parallel to the tracks. For CoCrTa, the averaged MFM signal drops faster with field compared to the hulk DC demagnetization (DCD) curve, This is different from CoCrPtTa where the MFM signal fits the DCD curve for fields applied along the track direction. For both media, the normalized MFM signal reduction with field is independent of recording density indicating reduced average demagnetizing fields

Keywords

chromium alloys; cobalt alloys; demagnetisation; magnetic fields; magnetic recording; magnetic thin films; tantalum alloys; 0.8 Gbit/in² recording; 5 Gbit/in²; CoCrTa; DC demagnetization curve; DC erasure; averaged MFM signal; demagnetizing fields; high density longitudinal media; in situ magnetic fields; reduced average demagnetizing fields; remanent state; written bits; Artificial intelligence; Demagnetization; High definition video; Magnetic field measurement; Magnetic fields; Magnetic force microscopy; Magnetic forces; Magnetic recording; Magnetization; Remanence;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.706635

Filename

706635