Wd Media, LLC

Rui Zhang

Antony Ajan

Tomoko Seki

Paul Christopher Dorsey

Kumar Srinivasan

Jiaxing Liu

Magnetic media having dual phase MgO-X seed layers with both MgO grains and segregants are provided. One such magnetic medium includes a substrate, a heatsink layer on the substrate, a dual phase seed layer on the heatsink layer, where the dual phase seed layer comprises MgO and a segregant, where a concentration of the MgO is greater than 50 percent by volume in the dual phase seed layer, and a magnetic recording layer including FePt on the dual phase seed layer.

Dual phase MgO-X seed layers for heat assisted magnetic recording media

Thermal barrier layers and seed layers for control of thermal and structural properties of heat assisted magnetic recording (HAMR) media are provided. One such HAMR medium includes a substrate, a heat sink layer on the substrate, a thermal barrier layer of SrTiOon the heat sink layer, an underlayer of MgO on the thermal barrier layer, and a magnetic recording layer on the underlayer. Another such HAMR medium includes a substrate, a heat sink layer on the substrate, a thermal barrier layer of an ABO3-type oxide on the heat sink layer, and a magnetic recording layer on the thermal barrier layer.

Thermal barrier layers and seed layers for control of thermal and structural properties of HAMR media

A heat-assisted magnetic recording (HAMR) media stack is provided in which Iridium (Ir)-based materials may be utilized as a secondary underlayer instead of a Magnesium Oxide (MgO) underlayer utilized in conventional media stacks. Such Ir-based materials may include, e.g., pure Ir, Ir-based alloys, Ir-based compounds, as well as a granular Ir layer with segregants. The use of Ir or Ir-based materials as an underlayer provide advantages over the use of MgO as an underlayer. For example, DC sputtering can be utilized to deposit the layers of the media stack, where the deposition rate of Ir is considerably higher than that of MgO resulting in higher manufacturing production yields. Further still, less particles are generated during Ir-based layer deposition processes, and Ir-based underlayer can act as a better heat sink. Further still, the morphology and structure of a recording layer deposited on an Ir-based layer can be better controlled.

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Milpitas, CA, United States of America

Rui Zhang