期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 138, 期 4, 页码 1122-1125出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b11688
关键词
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资金
- Ministerio de Economia y Competitividad (MINECO) (Spain)
- EU [ENE2014-56237-C4-4-R]
- Xunta de Galicia [GRC2014/042]
- UDC
- Fundacion Barrie
- Laboratory Directed Research and Development program at LANL
- U.S. National Science Foundation [DMR-1157490]
- State of Florida
- U.S. Department of Energy
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.
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