Patent ID: 7773342
Filing Date: 2010-08-10
Classification: G11B

Abstract:
1. A thin-film magnetic head comprising: a substrate having an opposed-to-medium surface and an element-formed surface perpendicular to said opposed-to-medium surface; an electromagnetic coil element for writing data signals, formed on/above said element-formed surface, and having a main magnetic pole layer, a pole end of said main magnetic pole layer reaching a head end surface on the side of said opposed-to-medium surface; and a near-field-light-generating portion for heating a portion of a magnetic recording medium during write operation with a near-field light generated by a uniform vibration of electric dipoles or free electrons in said near-field-light-generating portion, formed on/above said element-formed surface, and having a generation end reaching said head end surface, a shape of said generation end on said head end surface being a trapezoid with a shorter edge on the trailing side, or being a triangle with an apex on the trailing side and with a bottom on the leading side, and said shorter edge or said apex being provided adjacent to said pole end and on the leading side of said pole end, and a neighborhood of said shorter edge or said apex acting as a main heating portion emitting a strongest near-field light.