Patent ID: 9721592
Date: 2017-08-01
CPC Classifications: G11B

Claim:
1. A perpendicular magnetic recording head having an air bearing surface, comprising: a magnetic pole; a pair of side shields disposed to face each other with the magnetic pole interposed therebetween in a cross track direction; a pair of side gaps each provided between the magnetic pole and the pair of side shields; a trailing gap provided to cover the magnetic pole and the pair of side gaps, and having a first width in the cross track direction; a first magnetic layer covering the trailing gap and having a first magnetic layer width larger than the first width in the cross track direction; and a second magnetic layer provided to cover the first magnetic layer, the second magnetic layer having a second magnetic layer width in the cross track direction, wherein the second magnetic layer width in the cross track direction in the second magnetic layer at the air bearing surface is larger than the first magnetic layer width in the cross track direction in the first magnetic layer, the first magnetic layer has a first saturation flux density, the second magnetic layer has a second saturation flux density, and the first saturation flux density is higher than the second saturation flux density.