Ultrathin particulate magnetic recording media (abstract)
- 15 April 1987
- journal article
- conference paper
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 61 (8) , 3898
- https://doi.org/10.1063/1.338603
Abstract
This paper presents a novel method of producing an ultrathin and highly oriented particulate magnetic recording medium. The process involves the laying down of a monolayer of magnetically aligned particles where the thickness of the layer is limited only by the diameter of the magnetic particles. Thus, using commercially available magnetic particles, a 50–100‐nm‐thick magnetic layer can be produced. The particle deposition process depends on electrostatic interactions of charged particles with an oppositely charged disk surface in an aqueous medium. In order to reduce the tendency of the magnetic particles to aggregate, the particles are stabilized by adsorbed colloidal silica. Particle volume concentration (PVC) is higher than usually realized with conventional particulate media and it was measured in excess of 50%. A typical particulate monolayer has an Ms of 1.6×10−3 emu/cm2 and the orientation ratio (Mr/Ms) of 4–4.5. Resolution, at 150‐nm flying height, was measured at 1200 fc/mm with a high signal‐to‐noise ratio.This publication has 0 references indexed in Scilit: