R/W CHARACTERISTICS OF RING HEAD/Co-Cr MEDIA WITH SOFT MAGNETIC UNDERLAYER

Barium and Strontium Ferrite Perpendicular Thin Film Media with a Sendust Soft Magnetic Underlayer

The possibility of using sendust (FeAlSi) as the soft magnetic underlayer for hexagonal barium ferrite (BaM) and strontium ferrite (SrM) was studied. Sendust films were found to retain their soft magnetic properties with a rapid thermal anneal (RTA) at 800 C for 60 s, which is necessary to crystallize the as-deposited amorphous BaM and SrM films. Several film structures with sendust films as th...

New highly oriented soft magnetic underlayer structures for perpendicular recording

Highly oriented soft underlayers with face-centered-cubic ~fcc! phase Co, Co alloy, and composite NiFe/Co film structures have been epitaxially grown on single crystal Si wafers by sputter deposition. The epitaxial orientation relationships have been determined by x-ray diffraction and transmission electron microscopy. It was found that the soft underlayer magnetic properties can be modified in...

New Ni5Al3 Underlayer for Longitudinal Magnetic Recording Media

We describe a new Ni5Al3 underlayer for high-density longitudinal magnetic recording. The Ni5Al3 underlayer has the FCC derivative Ga3Pt5 structure. The Ni5Al3 (221) plane has good lattice match with the CoCrPt (10 1 0) plane. In addition, unlike the NiAl (112) plane, the Ni5Al3 (221) plane has the lowest surface energy. Hence, the Ni5Al3 thin film has a strong (221) texture and can induce CoCr...

Recording characteristics of perpendicular magnetic media with CoZrNb, NiFeNb, and exchange-pinned NiFeNb soft magnetic underlayers

Magnetic structures in Co-Cr media for perpendicular magnetic recording

High bit densities have been demonstrated in longitudinal as well as in perpendicular magnetic recording. For the latter an area density of more than 12 G b i t / i n 2 has been obtained in a sputtered C o C r T a hard disk with a soft magnetic underlayer recorded with a special single pole head. In this paper the role of microstructure and morphology in relation to the compositional separation...