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US 2014/0178714 A1Published application
Method and Manufacture Process for Exchange Decoupled First Magnetic Layer
AssigneeSeagate Technology LLC
InventorsZhong Stella Wu, Samuel Dacke Harkness, IV, Mariana Rodica Munteanu, Qixu Chen, Connie Chunling Liu
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Abstract
A perpendicular magnetic recording medium having a dual-layer magnetic film is disclosed. The bottom layer is completely exchange decoupled, and the top layer contains a certain amount of exchange coupling optimized for recording performance. Preferably, the bottom magnetic layer contains stable oxide material (for example, TiO2) and other non-magnetic elements (for example, Cr). A method of manufacturing the media is also disclosed.
Claims21
1-20. (canceled)
An apparatus, comprising:
- a substrate of a magnetic recording medium;
- and
- a granular magnetic layer of the medium, wherein the granular magnetic layer comprises one or more first layers being substantially completely exchange decoupled and one or more second layers being partially exchange coupled, wherein the one or more first layers have an Hc of greater than about 4,000 Oe and an Hn of less than about 0.25 H.
An apparatus, comprising:
- a substrate of a magnetic recording medium;
- and
- a granular magnetic layer of the medium, wherein the granular magnetic layer comprises one or more first layers being substantially completely exchange decoupled and one or more second layers being partially exchange coupled, wherein an exchange coupling of the granular magnetic layer is tuned by varying a thickness of the one or more second layers, and wherein the one or more first layers have an Hc of greater than about 4,000 Oe and an Hn of less than about 0.25 Hc.
An apparatus, comprising:
- a substrate;
- one or more soft underlayers;
- one or more seed layers;
- one or more interlayers;
- a granular magnetic recording layer;
- and
- one or more cap layers, wherein the granular magnetic layer comprises one or more first layers being substantially completely exchange decoupled and one or more second layers being partially exchange coupled, wherein the one or more first layers have an Hc of greater than about 4,000 Oe and an Hn of less than about 0.25 Hc.
4 more elements
Dependencies are inferred from the claim text.