2D Heterostructure of CoCl₂/Co₃O₄ Built for Strong Enhanced Magnetism

Abstract As a remarkable structure, 2D magnetic heterojunctions have attracted researchers’ attention owing to their controlled manipulation in the electronic device. However, successful fabrication as well as modulation of their structure and compound remain challenging. Herein, a novel method is designed to obtain a CoCl₂/Co₃O₄ heterojunction on Si/SiO₂ substrate with the assistance of supercritical CO₂ (SC CO₂), and the as‐fabricated sample has significantly increased coercivity and saturation magnetization, which is 11 times higher than pure Co₃O₄. Further, it can be found that the CO₂ pressure has the decisive effect on the saturation magnetization of the sample. Therefore, it suggests that the tunable electronic‐magnetic device can be anticipated to be obtained in the future.