Heat assisted magnetic recording media having moment keeper layer
View Patent ↗Systems and methods for providing media having a moment keeper layer for heat assisted magnetic recording (HAMR). One such method for writing information to a magnetic media having a moment keeper layer using heat assisted magnetic recording includes heating a portion of the media to a preselected temperature, where the media includes a magnetic recording layer adjacent to the keeper layer, where a Curie temperature of the keeper layer is greater than a Curie temperature of the recording layer, and where the preselected temperature is about equal to, or greater than, the Curie temperature of the recording layer, allowing the portion of the media to cool, and writing information to the media during the cooling.
1. A magnetic media for heat assisted magnetic recording (HAMR), the magnetic media comprising:
a substrate;
at least one intermediate layer on the substrate;
a magnetic recording layer on the at least one intermediate layer; and
a keeper layer on the at least one intermediate layer,
wherein a Curie temperature of the keeper layer is greater than a Curie temperature of the recording layer, and
wherein the keeper layer comprises a one to one grain correspondence with the recording layer.
2. The media of claim 1 , wherein a magnetic anisotropy of the keeper layer is greater than a magnetic anisotropy of the recording layer at a preselected temperature.
3. The method of claim 1 , wherein a magnetization of the keeper layer is greater than a magnetization of the recording layer at the preselected temperature.
4. The media of claim 1 , wherein the keeper layer is on the recording layer.
5. The media of claim 1 , wherein the recording layer is on the keeper layer.
6. The media of claim 1 , further comprising an exchange break layer positioned between the keeper layer and the recording layer.
7. The media of claim 1 , wherein the keeper layer comprises a minimal amount of lateral exchange coupling.
8. The media of claim 1 , wherein the media comprises a vertical exchange coupling between grains of the keeper layer and grains of the recording layer.