2D Amorphous Heterointerface Engineering for Enhanced Ferromagnetism in MoO3–x/Graphene Oxide

Abstract

Two-dimensional (2D) amorphous materials have broad potential for applications in magnetic property modulation and functional material design due to their unique electronic structures and abundant surface defects. However, the challenge of achieving room-temperature ferromagnetism in these materials limits their application in spintronics. In this study, a heterostructure between 2D amorphous molybdenum oxide (MoO_3–x) and graphene oxide (GO) was constructed, achieving room-temperature ferromagnetism with a Curie temperature of greater than 350 K. The influence of interfacial oxygen atom migration on the distribution of oxygen vacancies and the modulation of magnetic properties was systematically investigated. The results indicate that interfacial charge transfer significantly modulated the Mo d-electron states, activating the ferromagnetic activity of MoO_3–x. Moreover, carbon defects at the heterointerface induced oxygen atom migration, further enhancing the ferromagnetic behavior. This work provides atomic-scale insights into the magnetic regulatory mechanism of 2D amorphous ferromagnetic oxide materials by heterointerface engineering, offering new strategies for the design and application of 2D magnetic amorphous materials and expanding their potential applications in spintronics.