ALEXANDRIA, Va., July 21 -- United States Patent no. 12,688,873, issued on July 21, was assigned to Seagate Technology LLC (Fremont, Calif.).

"Heat-assisted magnetic recording heads with additional magnetic material" was invented by Michael Allen Seigler (Eden Prairie, Minn.), Weibin Chen (Bloomington, Minn.), Jianhua Xue (Maple Grove, Minn.), Jie Gong (Eden Prairie, Minn.), Joseph Roth (Minneapolis) and Tong Zhao (Eden Prairie, Minn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Described are magnetic write heads for heat-assisted magnetic recording (HAMR) in which either or both of the heat sink disk or middle disk of the near field transducer are composed of magnetic materials. In addition, any diffusion...