2014/11/02 by Zhiguo Liu, Shangfei Wu, Liu, Zhi-Guo +15
Engineering · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Magnetic Properties and Synthesis of Ferrites #Magnetic properties of thin films #Magneto-Optical Properties and Applications #Strongly Correlated Electrons (cond-mat.str-el)
paper · pdf · doi:10.48550/arxiv.1411.0208
openalex publication_date 2014/11/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
High quality single crystal Fe3O4 thin films with (111) orientation had been prepared on amorphous SiO2 substrate by pulsed laser deposition. The magnetization properties of the films are found to be highly unconventional. The Verwey transition temperature derived from the magnetization jump is around 140K, which is higher than the bulk value and it can be slightly suppressed by out-plane magnetic field; the out-of-plane magnetization, which is unexpectedly higher than the in-plane value, is also significantly increased as compared with the bulk value. Our findings suggest that the local Coulomb correlation U and the effective ferromagnetic exchange interaction J of Fe 3d electrons are both dramatically strengthened and out-of-plane directionally entangled by the unusual coupling between Fe3O4 thin film and the amorphous SiO2 substrate.