Composite HAMR media structure for high areal density
AssigneesSeagate Technology LLC, Regents of the University of Minnesota
InventorsRandall Victora, Zengyuan Liu, Pin-wei Huang, Ganping Ju, Jan-Ulrich Thiele
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Abstract
A heat-assisted magnetic recording media structure with exchange-coupled composite layer structure may be utilized in a data storage device. The heat-assisted magnetic recording disk structure can have a FePt-based layer as a storage layer and a FePt-based or a CoPt-based magnetic layer with higher Curie temperature as a write layer. The interface between the write layer and the storage layer may be separated by an exchange control layer. The composite structure can be optimized to reduce jitter for high density data storage by tuning the exchange coupling between the write layer and storage layer.
Claims20
An apparatus comprising a data storage medium having an exchange coupled composite (ECC) structure comprising a coupling layer (ECL) contacting and disposed between a storage layer and a write layer, the storage layer having a lower Curie temperature and a higher anisotropy than the respective ECL and write layers, the ECL coupling the write layer to the storage layer with a coupling strength from 0.1 Jex/Jo to 0.6 Jex/Jo.
An apparatus comprising a heat-assisted magnetic recording (HAMR) data storage medium having an exchange coupled composite (ECC) structure comprising a coupling layer (ECL) contacting and disposed between a storage layer and a write layer, the storage layer comprising an FePtX material and the write layer comprising a FePtY or CoPtZ material where X, Y, and Z are chosen from the group of C, an oxide, a nitride, and a carbide, the storage layer having a lower Curie temperature and a higher anisotropy than the respective ECL and write layers, the ECL coupling the write layer to the storage layer with a coupling strength that corresponds with a transition jitter for the ECC of 2 nm or less.
A method comprising:
- forming a storage layer atop a substrate;
- depositing an exchange coupling layer in contact with the storage layer;
- creating a write layer in contact with the exchange coupling layer, the storage layer having a lower Curie temperature and a higher anisotropy than the respective ECL and write layers, the ECL coupling the write layer to the storage layer with a coupling strength of 0.1-0.6 Jex/Jo;
- and
- applying a data write field to the storage, exchange coupling, and write layers to provide a predetermined magnetic polarity.
Dependencies are inferred from the claim text.