Magnetic Dispersion of Microparticles Using Magnetic Fluid — Application to Texturing Process for Magnetic Rigid Disk

In order to make well-arranged asperities on Al-alloy substrates of magnetic rigid disk as a texturing process, a new texturing method using magnetic fluid and magnetic field was developed, and its fundamental properties were shown. By applying magnetic field and normal load to the magnetic fluid including 4μm SiO2 micro particles in the gap between the Al-alloy substrate and the glass plate, well-arranged micro particles were indented to the substrate and then made well-arranged asperities. It is concluded that magnetic field controlled the density of micro particles and the distance between micro particles well.