Soft underlayer structure for magnetic recording

Details Soft underlayer structure for magnetic recording Soft underlayer structure for magnetic recording

2005-05-10

2005-05-10

Bernatz, Kevin M. (Department: 1773)

Stock material or miscellaneous articles

All metal or with adjacent metals

Having magnetic properties, or preformed fiber orientation...

C428S668000, C428S678000, C428S679000, C428S680000, C428S681000, C428S653000, C428S215000, C428S332000, C428S690000, C428S690000

Reexamination Certificate

active

06890667

ABSTRACT:
A magnetic recording medium having a soft magnetic underlayer structure that includes two soft underlayers is presented. A thick first soft underlayer, disposed on the medium substrate, is made of material which provides a low magnitude of magnetization saturation (Bsat) and high permeability. The first soft underlayer can be formed by plating or high-rate sputtering. The second soft underlayer, which has a lesser thickness than the first soft underlayer, is made of a material which provides a relatively high magnitude of Bsat and low permeability. The second soft underlayer can be formed by low-rate sputtering. The first soft under layer can be isolated from other layers in the medium by an exchange isolation layer. The second soft underlayer can be exchange coupled to a radial exchange pin layer disposed on the exchange isolation layer.

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English Translation of JP 10-228620 A (Tsuboi et al., PTO 04-2291).*
JPO Abstract Translation of JP 2001-155322 A (Doc. ID: JP 2001155322 A).*
JPO Abstract Translation of JP 10-228620 A (Doc. ID: JP 10228620 A).*
Machine Translation of JP 10-228620-A.*
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