Patent ID: 9053732
Filing Date: 2015-06-09
Classification: G11B,H01F

Abstract:
1. A method of forming a perpendicular magnetic recording medium, the perpendicular magnetic recording medium comprising a substrate, an underlayer on the substrate, an intermediate layer on the underlayer and a recording layer on the intermediate layer, the underlayer comprising a first soft underlayer, an antiferromagnetically coupled Ru layer on the first soft underlayer, a second soft underlayer on the antiferromagnetically coupled Ru layer, and an orientation control layer on the second soft underlayer, the method comprising applying a negative bias voltage to the substrate during formation of the underlayer, wherein the negative bias voltage is applied to the substrate during formation of one of: the first soft underlayer and the second soft underlayer, and further comprising removing the negative bias voltage during formation of a portion of the one of: the first soft underlayer and the second soft underlayer adjacent the antiferromagnetically coupled Ru layer.