Patent ID: 8339737

Claim:
A perpendicular magnetic write head comprising: a magnetic pole; a non-magnetic protruding layer formed on side regions of the magnetic pole in a writing track width direction of the magnetic pole, and no other regions of the magnetic pole, the non-magnetic protruding layer protruding from the magnetic pole toward an air bearing surface (ABS) side; and a protective film formed to cover at least the magnetic pole from the air bearing surface side, wherein (a) the non-magnetic protruding layer has an etch rate lower than an etch rate of the magnetic pole such that the non-magnetic protruding layer etches more slowly than the magnetic pole when forming the ABS side, and (b) the non-magnetic protruding layer includes at least one of ruthenium (Ru), titanium (Ti), tantalum (Ta), tungsten (W), chromium (Cr), and a nickel chromium alloy (NiCr).