A CROSS-TYPE AMORPHOUS VIDEO HEAD

A cross-type video head composed of cross-shaped amorphous sputtered f ilms and ferrite that can be used with high coercive tapes is describe d. A three-dimensional magnetic field calculation shows that the cross -type head has a strong recording field and high reproduction efficien cy compared to a conventional metal-in-gap head (MIG) or a plate-type head. No large bumps in the output spectrum are observed during record ing and reproduction under normal conditions with the cross-type head. The amorphous sputtered film deposited on the inclined plane of the f errite substrate used for the cross-type head shows a homogeneous stru cture and high permeability similar to that of a film deposited on a h orizontal plane. A cross-type head using a Co-Nb-Zr amorphous film ann ealed in a magnetic field under optimum conditions shows excellent rec ording and reproduction characteristics when used with a high coercivi ty metal tape.