Magnetic heads for perpendicular recording and magnetic recording disk apparatus using the same

A magnetic head comprising at least a main pole,

• wherein the profile of the main pole on the magnetic head air bearing surface is such that:
• it is composed of a first portion whose length in the cross-track direction continuously increases from the leading edge to the trailing edge, and a second portion located on the side of the trailing edge of the first portion;
• and
• the second portion's length in the cross-track direction at the trailing edge is larger than the length in the cross-track direction at the point of contact between the first and second portions;
• the second portion's length in the track running direction is smaller than the first portion's length in the track running direction;
• and
• the rate of change in the length in the cross-track direction at the point of contact between the first and second portions is different from the rate of increase in the first portion's length in the cross-track direction.

A magnetic recording disk apparatus having at least a magnetic head incorporating a main pole, a magnetic disk medium, and means for rotating the magnetic disk medium in a fixed direction,

• wherein the profile of the main pole on the magnetic head air bearing surface is such that:
• it is composed of a first portion whose length in the cross-track direction continuously increases from the upstream side to the downstream side in the rotational direction of the magnetic disk, and a second portion located on the downstream side of the first portion in the disk rotational direction;
• and
• the second portion's length in the cross-track direction at the trailing edge is larger than the length in the cross-track direction at the point of contact between the first and second portions;
• and
• the rate of change in the second portion's length in the cross-track direction from the upstream side to the down stream side in the rotational direction of the magnetic disk medium is different from the rate of change in the first portion's length in the cross-track direction from the upstream side to the downstream side in the rotational direction of the magnetic disk medium;
• and
• the second portion's length in the track running direction is smaller than the first portion's length in the track running direction.