Title :
Noise characteristics in exchange-biased soft underlayers for perpendicular media
Author :
Wierman, K.W. ; Platt, C.L. ; Svedberg, E.B. ; Yu, J. ; van de Veerdonk, R.J.M. ; Eppler, W.R. ; Howard, K.J.
Author_Institution :
Seagate Res., Pittsburgh, PA, USA
fDate :
11/1/2001 12:00:00 AM
Abstract :
The characteristics of exchange-biased soft underlayers (SULs) were investigated using magnetic force microscopy and spin stand measurements with a single-pole (focused ion-beam trimmed gap) writer and magnetoresistive head. The SUL high-moment materials (FeCoB, FeAlN) were exchange biased by using IrMn. Spin stand data on perpendicular media (CoCrPtB) with an exchange-biased FeCoB SUL also showed a low integrated dc erase noise level, demonstrating its potential for use in double-layered perpendicular media
Keywords :
boron alloys; chromium alloys; cobalt alloys; exchange interactions (electron); ferromagnetic materials; focused ion beam technology; iridium alloys; iron alloys; magnetic force microscopy; magnetic heads; magnetic multilayers; magnetic recording noise; magnetoresistive devices; manganese alloys; perpendicular magnetic anisotropy; perpendicular magnetic recording; platinum alloys; soft magnetic materials; CoCrPtB; CoCrPtB-IrMn-FeCoB; FeCoB; double-layered media; exchange-biased soft underlayers; focused ion-beam trimmed gap; integrated dc erase noise level; magnetic force microscopy; magnetoresistive head; noise characteristics; perpendicular media; single-pole writer; spin stand measurements; Amorphous magnetic materials; Ceramics; Glass; Iron; Magnetic heads; Magnetic materials; Magnetic noise; Nonhomogeneous media; Signal to noise ratio; Soft magnetic materials;
Journal_Title :
Magnetics, IEEE Transactions on
