ALEXANDRIA, Va., March 19 -- United States Patent no. 12,256,644, issued on March 18, was assigned to National Tsing Hua University (Hsinchu, Taiwan).

"Magnetoresistive sensor and manufacturing method thereof" was invented by Chih-Huang Lai (Hsinchu, Taiwan), Chia-Chang Lee (Hsinchu, Taiwan) and Yu-Shen Yen (Hsinchu, Taiwan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A magnetoresistive sensor and a manufacturing method thereof are provided. The method includes: forming an initial reference layer in an annular shape, wherein the initial reference layer includes an anti-ferromagnetic layer and a ferromagnetic layer; performing a heat treatment on the initial reference layer, wherein the ferromagnetic layer ...