Aftereffect and accommodation anisotropy in metal-particle and metal-evaporated recording media

Aftereffect and accommodation are measured in metal recording media using either evaporated cobalt (ME) or particulate iron (MP) as the magnetic material. These materials are highly anisotropic and measurements have been made parallel to the plane of the media both along the easy direction and along the hard direction. Along the easy direction, the loops are square and there is only a small difference between the coercive field, H_c, and the remanent coercive field, H_ci. Along the hard direction the squareness is approximately one-half that along the easy axis and H_ci is shifted considerably from H_c