Magnetic Ordering-Induced Multiferroic Behavior in [CH3NH3][Co(HCOO)3] Metal–Organic Framework

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• 作者：L. Claudia Gómez-Aguirre ; Breogán Pato-Doldán ; J. Mira ; Socorro Castro-García ; María Antonia Se?arís-Rodríguez ; Manuel Sánchez-Andújar ; John Singleton ; Vivien S. Zapf
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：February 3, 2016
• 年：2016
• 卷：138
• 期：4
• 页码：1122-1125
• 全文大小：307K
• ISSN：1520-5126

文摘

We present the first example of magnetic ordering-induced multiferroic behavior in a metal–organic framework magnet. This compound is [CH<sub>3sub>NH<sub>3sub>][Co(HCOO)<sub>3sub>] with a perovskite-like structure. The A-site [CH<sub>3sub>NH<sub>3sub>]<sup>+sup> 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.