Thin film media with and without bicrystal cluster structure on glass ceramic substrates

Author

Chen, Qixu ; Chang, Jack J.K. ; Chen, Ga-Lane ; Sinclair, Robert

Author_Institution

Seagate Technol. Recording Group, Milpitas, CA, USA

Volume

32

Issue

5

fYear

1996

fDate

9/1/1996 12:00:00 AM

Firstpage

3599

Lastpage

3601

Abstract

The effect of bicrystal structure on media noise was studied experimentally. Disk samples with and without bicrystal structures have been produced on glass ceramic substrates using different Co/Cr epitaxial systems, (112¯0)/(200) and (101¯1)||(110). With similar magnetic properties and grain size, the former sample with the bicrystal structure has 5 dB better signal-to-noise ratio (SNR), even though the δM curve suggests that the sample with bicrystal structure has stronger intergranular exchange coupling. The interface between NiP and Cr of the sample with bicrystals is rougher than that of the sample without bicrystals. It is suggested that the micro-roughness of the interface between NiP and Cr could affect the formation of Cr(200) texture

Keywords

bicrystals; chromium; chromium alloys; cobalt alloys; exchange interactions (electron); ferromagnetic materials; grain size; interface structure; magnetic epitaxial layers; magnetic multilayers; magnetic recording noise; nickel alloys; platinum alloys; substrates; tantalum alloys; Co/Cr epitaxial systems; Cr (200) texture; NiP-Cr interface; NiP-Cr-CoCrPtTa-C; bicrystal cluster structure; disk samples; glass ceramic substrates; grain size; interface microroughness; intergranular exchange coupling; magnetic properties; media noise; signal-to-noise ratio; thin film media; Ceramics; Chromium; Couplings; Glass; Grain size; Magnetic noise; Magnetic properties; Signal to noise ratio; Substrates; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.538702

Filename

538702