US 12,254,907 B2
Dual layer graded curie temperature HAMR media
Thomas Young Chang, Singapore (SG); Aneesh Venugopal, Edina, MN (US); and Philip Lisle Steiner, Los Altos, CA (US)
Assigned to SEAGATE TECHNOLOGY LLC, Fremont, CA (US)
Filed by Seagate Technology LLC, Fremont, CA (US)
Filed on Feb. 29, 2024, as Appl. No. 18/592,111.
Claims priority of provisional application 63/493,493, filed on Mar. 31, 2023.
Prior Publication US 2024/0331725 A1, Oct. 3, 2024
Int. Cl. G11B 5/31 (2006.01); G11B 5/66 (2006.01); G11B 5/00 (2006.01)
CPC G11B 5/3146 (2013.01) [G11B 5/66 (2013.01); G11B 2005/0021 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a first magnetic layer having a first surface and second surface;
a second magnetic layer having a third surface and a fourth surface;
a break layer between the first surface of the first magnetic layer and the third surface of the second magnetic layer;
wherein the first magnetic layer has a first Curie temperature that varies between the first surface and the second surface to define a first average Curie temperature and a first Curie temperature gradient;
wherein the second magnetic layer has a second Curie temperature that varies between the third surface and the fourth surface to define a second average Curie temperature and a second Curie temperature gradient;
wherein the first average Curie temperature is higher than the second average Curie temperature; and
wherein the first Curie temperature at the first surface of the first magnetic layer is higher than the second Curie temperature at the third surface of the second magnetic layer.