MAGNETIC-PROPERTIES AND MICROSTRUCTURE OF EVAPORATED CO OXIDE TAPE MEDIA

The magnetic properties and microstructure of Co oxide tape media were studied. The intrinsic in-plane and out-of-plane anisotropy constants of metal evaporated CoO tape media were measured from the in-plane to rque and the out-of-plane torque curves. It was found that after consi dering the tilting effect of the column, the total intrinsic anisotrop y constant, calculated from the in-plane torque curve, is much less th an that calculated from the out-of-plane anisotropy constant. TEM elec tron diffraction studies indicate that the Co c-axes are randomly orie nted. However, from the in-plane hysteresis loop measurements, the eas y axes are pretty well parallel to incident beam plane. The cross sect ional TEM micrograph shows that the column is tilted 30 degrees out-of -plane and has a diameter of 10 nm.