Heat-assisted magnetic recording (HAMR) medium including a split heat-sink structure (SHSS)

A heat-assisted magnetic recording (HAMR) medium, comprising:

• a substrate;
• a split heat-sink structure (SHSS), comprising:
• a first heat-sink layer disposed on the substrate;
• a heat-sink break layer (HSBL) disposed on the first heat-sink layer;
• and
• a second heat-sink layer disposed on the HSBL;
• and
• a magnetic recording layer disposed on the SHSS,
• wherein the HSBL comprises CoX, wherein X is a second constituent selected from the group consisting of Cr, Pt, Ag, Ru and combinations thereof, and
• wherein the HSBL comprises two phases, wherein a first phase material comprises the CoX and a second phase material comprises a third constituent, Y, selected from the group consisting of SiO2, SiOx, MgO, Cr2O3, CrOx, HfO2, ZrO2, TiO2, TiOx, Ta2O5, TaOx, WO3, WOx, and combinations thereof.

A heat-assisted magnetic recording (HAMR) medium, comprising:

• a substrate;
• a split heat-sink structure (SHSS), comprising:
• a first heat-sink layer disposed on the substrate;
• a heat-sink break layer (HSBL) disposed on the first heat-sink layer;
• and
• a second heat-sink layer disposed on the HSBL;
• and
• a magnetic recording layer disposed on the SHSS,
• wherein the HSBL comprises CoX, wherein X is a second constituent selected from the group consisting of Cr, Pt, Ag, Ru and combinations thereof, and
• wherein the CoX has a substantially hexagonal close-packed (HCP) crystal structure, and a (0002) preferred orientation.

A heat-assisted magnetic recording (HAMR) medium, comprising:

• a substrate;
• a split heat-sink structure (SHSS), comprising:
• a first heat-sink layer disposed on the substrate;
• a heat-sink break layer (HSBL) disposed on the first heat-sink layer;
• and
• a second heat-sink layer disposed on the HSBL;
• and
• a magnetic recording layer disposed on the SHSS,
• wherein the HSBL comprises a mixture of a first phase and a second phase, wherein the first phase comprises a first-phase material comprising a metallic material with a columnar structure, and the second phase comprises a second-phase material comprising a material that is disposed between the grains of the first phase material.

A heat-assisted magnetic recording (HAMR) medium, comprising:

• a substrate;
• a split heat-sink structure (SHSS), comprising:
• a first heat-sink layer disposed on the substrate;
• a heat-sink break layer (HSBL) disposed on the first heat-sink layer;
• and
• a second heat-sink layer disposed on the HSBL;
• and
• a magnetic recording layer disposed on the SHSS,
• wherein the first heat-sink layer and the second heat-sink layer comprise Ru, and the HSBL comprises a material selected from the group consisting of CoCrSiO2, CoPtSiO2, CoAgSiO2, CoRuSiO2, CoCrTiO2, CoPtTiO2, CoAgTiO2, CoRuTiO2, CoCr, CoPt, CoAg, and CoRu.

A heat-assisted magnetic recording (HAMR) medium, comprising:

• a substrate;
• a split heat-sink structure (SHSS), comprising:
• a first heat-sink layer disposed on the substrate;
• a heat-sink break layer (HSBL) disposed on the first heat-sink layer;
• and
• a second heat-sink layer disposed on the HSBL;
• a magnetic recording layer disposed on the SHSS;
• an adhesion layer disposed between the substrate and the SHSS;
• an amorphous underlayer (AUL) disposed on the SHSS;
• an orientation-control layer disposed between the AUL and the magnetic recording layer;
• and
• an overcoat layer disposed on the magnetic recording layer.

A method for making a HAMR medium for heat assisted magnetic recording (HAMR), comprising:

• providing a substrate;
• depositing a split heat-sink structure (SHSS), comprising:
• depositing first heat-sink layer on the substrate;
• depositing heat-sink break layer (HSBL) on the first heat-sink layer;
• and
• depositing second heat-sink layer on the HSBL;
• and
• depositing a magnetic recording layer on the SHSS,
• wherein a thermal resistance of the HSBL is greater than a thermal resistance of the first heat-sink layer, and the thermal resistance of the HSBL is greater than a thermal resistance of the second heat-sink layer.

A method for making a HAMR medium for heat assisted magnetic recording (HAMR), comprising:

• placing a substrate in a thin-film deposition tool;
• depositing a split heat-sink structure (SHSS), comprising:
• depositing first heat-sink layer on the substrate;
• depositing heat-sink break layer (HSBL) on the first heat-sink layer;
• and
• depositing second heat-sink layer on the HSBL;
• and
• depositing a magnetic recording layer on the SHSS,
• wherein the HSBL comprises a mixture of a first phase and a second phase, wherein the first phase comprises a first-phase material comprising a metallic material with a columnar structure, and the second phase comprises a second-phase material comprising a material that is disposed between the grains of the first phase material.