Abstract
To achieve high density magnetic recording media through systematic experiments by applying the ultra clean sputtering process the following universal guiding principles are proposed: (1) Hc/Hkgrain ≈ 0.4 (isotropic), (2) to suppress the magnetostatic coupling effect due to the grain size reduction 4πMs/Hkgrain < 1.0, (3) grain diameter < 10 nm, (4) (110), (100) preferred grain orientation of HCP crystallite, (5) for the improvement of D50, tBr < 50 Gμm, (6) for freezing the superparamagnetic effect due to grain size reduction vKugrain/kT ≥ 40, Kugrain ≥ 3 × 106 erg/cm3 (v: volume of magnetic grain, Kugrain : magnetocrystalline anisotropy energy constant, kT: thermal energy).
Original language | English |
---|---|
Pages (from-to) | 44-51 |
Number of pages | 8 |
Journal | Journal of Magnetism and Magnetic Materials |
Volume | 193 |
Issue number | 1-3 |
DOIs | |
Publication status | Published - 1999 Jan 1 |
Keywords
- Grain diameter
- High density magnetic recording
- Intergranular exchange coupling
- Intergranular magnetostatic coupling
- Magnetocrystalline anisotropy energy constant
- Preferred grain orientation
- Thin film media
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics