Title :
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
fDate :
9/1/1996 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
