Continuous Collapse of the Spin Cycloid in BiFeO3 Thin Films under an Applied Magnetic Field probed by Neutron Scattering

作     者：Pervez, Md Firoz Zhang, Hongrui Huang, Yen-Lin Caretta, Lucas Ramesh, Ramamoorthy Ulrich, Clemens 

作者机构：School of Physics The University of New South Wales NSW2052 Australia Materials Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Ningbo Institute of Materials Technology & Engineering Chinese Academy of Sciences Ningbo315201 China Department of Materials Science and Engineering University of California BerkeleyCA94720 United States School of Engineering Brown University ProvidenceRI02912 United States Department of Physics University of California BerkeleyCA94720 United States Materials Science and NanoEngineering Rice University HoustonTX77005 United States Departments of Chemistry and Physics and Astronomy Rice University HoustonTX77005 United States Rice Advanced Materials Institute Rice University HoustonTX77005 United States 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2024年

核心收录：

主　　题：Magnetic fields 

摘      要：Bismuth ferrite (BiFeO3) is one of the rare materials that exhibits multiferroic properties already at room-temperature. Therefore, it offers tremendous potential for future technological applications, such as memory and logic. However, a weak magnetoelectric coupling together with the presence of a noncollinear cycloidal spin order restricts various practical applications of BiFeO3. Therefore, there is a large interest in the search for suitable methods for the modulation of the spin cycloid in BiFeO3. By performing neutron diffraction experiments using a triple-axis instrument we have determined that the spin cycloid can be systematically suppressed by applying a high magnetic field of 10 T in a BiFeO3 thin film of about 100 nm grown on a (110)-oriented SrTiO3 substrate. As predicted by previous theoretical calculations, we observed that the required critical magnetic field to suppress the spin cycloid in a BiFeO3 thin film was lower as compared to the previously reported critical magnetic field for bulk BiFeO3 single crystals. Our experiment reveals that the spin cycloid continuously expands with increasing magnetic field before the complete transformation into a G-type antiferromagnetic spin order. Such tuning of the length of the spin cycloid up to a complete suppression offers new functionalities for future technological applications as in spintronics or magnonics. Copyright © 2024, The Authors. All rights reserved.