The apparatus records the image signal whose space frequency of the vertical direction, esp. brightness signal, is preemphasized. And the space frequency of the vertical direction in the reproduction image signal is de-emphasized to reproduce the original image signal when reproducing the recorded signal. The apparatus includes a switching pulse generator (29) controlling switches (27,30) to conne...

This invention relates to a thin film of an amorphous magnetic material including ion-nitride having the formula FexN1-x, where x is from 0.4 to 0.7. The film is deposited on a substrate by sputter deposition in the presence of an inert gas and at a pressure from 25 mu m to 100 mu m. The coercivity of the magnetic material varies as a function of the gas pressure employed during sputtering.