title: Magnetic Ordering-Induced Multiferroic Behavior in [CH3NH3][Co(HCOO)3] Metal-Organic Framework.
abstract: We present the first example of magnetic ordering-induced multiferroic behavior in a metal-organic framework magnet. This compound is [CH3NH3][Co(HCOO)3] with a perovskite-like structure. The A-site [CH3NH3](+) cation strongly distorts the framework, allowing anisotropic magnetic and electric behavior and coupling between them to occur. This material is a spin canted antiferromagnet below 15.9 K with a weak ferromagnetic component attributable to Dzyaloshinskii-Moriya (DM) interactions and experiences a discontinuous hysteretic magnetic-field-induced switching along [010] and a more continuous hysteresis along [101]. Coupling between the magnetic and electric order is resolved when the field is applied along this [101]: a spin rearrangement occurs at a critical magnetic field in the ac plane that induces a change in the electric polarization along [101] and [10-1]. The electric polarization exhibits an unusual memory effect, as it remembers the direction of the previous two magnetic-field pulses applied. The data are consistent with an inverse-DM mechanism for multiferroic behavior.
authors.affiliation: Department of Fundamental Chemistry, Faculty of Sciences, University of A Coruña , 15071 A Coruña, Spain.
authors.forename: L Claudia
authors.initials: LC
authors.lastname: Gómez-Aguirre
authors.affiliation: Department of Fundamental Chemistry, Faculty of Sciences, University of A Coruña , 15071 A Coruña, Spain.
authors.forename: Breogán
authors.initials: B
authors.lastname: Pato-Doldán
authors.affiliation: Department of Applied Physics, University of Santiago de Compostela , 15782 Santiago de Compostela, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Mira
authors.affiliation: Department of Fundamental Chemistry, Faculty of Sciences, University of A Coruña , 15071 A Coruña, Spain.
authors.forename: Socorro
authors.initials: S
authors.lastname: Castro-García
authors.affiliation: Department of Fundamental Chemistry, Faculty of Sciences, University of A Coruña , 15071 A Coruña, Spain.
authors.forename: María Antonia
authors.initials: MA
authors.lastname: Señarís-Rodríguez
authors.affiliation: Department of Fundamental Chemistry, Faculty of Sciences, University of A Coruña , 15071 A Coruña, Spain.
authors.forename: Manuel
authors.initials: M
authors.lastname: Sánchez-Andújar
authors.affiliation: National High Magnetic Field Laboratory, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States.
authors.forename: John
authors.initials: J
authors.lastname: Singleton
authors.affiliation: National High Magnetic Field Laboratory, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States.
authors.forename: Vivien S
authors.initials: VS
authors.lastname: Zapf