2019/06/03 by César Menéndez, Menendez, Cesar, Dewei Chu +3
Engineering · Materials Science · #FOS: Physical sciences #Magnetic Field Sensors Techniques #Magnetic and transport properties of perovskites and related materials #Materials Science (cond-mat.mtrl-sci) #Multiferroics and related materials
paper · pdf · doi:10.48550/arxiv.1906.01117
openalex publication_date 2019/06/03 · openalex created_date 2022/07/29 · openalex updated_date 2026/07/28
Multiferroics in which giant ferroelectric polarization and magnetism coexist\nare of tremendous potential for engineering disruptive applications in\ninformation storage and energy conversion. Yet the functional properties of\nmultiferroics are thought to be affected detrimentally by the presence of point\ndefects, which may be abundant due to the volatile nature of some constituent\natoms and high temperatures involved in materials preparation. Here, we\ndemonstrate with theoretical methods that oxygen vacancies may enhance the\nfunctionality of multiferroics by radically changing their magnetic\ninteractions in thin films. Specifically, oxygen vacancies may restore missing\nmagnetic super-exchange interactions in large axial ratio phases, leading to\nfull antiferromagnetic spin ordering, and induce the stabilization of\nferrimagnetic states with a significant net magnetization of 0.5 uB per formula\nunit. Our theoretical study should help to clarify the origins of long-standing\ncontroversies in bismuth ferrite and improve the design of technological\napplications based on multiferroics.\n