| 摘要 |
PURPOSE:To allow magnetic flux response-type reproduction by using the conventional medium as it stands and by changing the part of the head by using transparent materials, by detecting the strength change of reflective light by the traverse Kerr effect of optical beams, and by reading the direction of internal magnetization of the head. CONSTITUTION:A thin-film magnetic head 1 with a transparent base plate 10 is installed on a magnetic recording medium 20 so that a gap 16 contacts with the head 1, and it makes a laser optical beam 30 fall on the surface of a lower-part magnetic pole 11 obliquely through the base plate 10. The falling-on direction shall be the direction where light falls on the surface of the pole 11 obliquely for the surface inside which is vertical with the direction (arrow) of internal magnetization of the thin-film magnetic head 1. The incident light beam 30 is reflected on the surface of the lower-part magnetic pole 11, and is reflected in the opposite direction of the falling-on direction from the surface of the base plate 10. Since the reflection rate of the surface changes in accordance with the change of internal magnetization by the traverse Kerr effect operation at this time, the output indicates the direction and the magnitude of internal magnetization when a reflective beam 31 is detected by a photo-sensor 35 photoelectrically. |
