期刊
ADVANCED MATERIALS
卷 29, 期 23, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201606966
关键词
bipolar switching; bistability; exchange bias; ferroelastic phase transition; switchable dielectric constant
类别
资金
- NNSF of China [21290171, 21471112, 21403116, 21421001, 21531005, 91622111]
Multiple switchable physical properties have been demonstrated in one single niccolite structural metal-organic framework, [(CH3CH2)(2)NH2] [(FeFeII)-Fe-III(HCOO)(6)] (1), including (i) a reversible ferroelastic phase transition triggered by freezing the disordered (CH3CH2)(2)NH2+ cations, (ii) a thermally switchable dielectric constant transition accompanied by phase transition, and (iii) thermal and positive magnetic field driven magnetic poles reversal at low temperatures, attributed to different responses of the magnetization of Fe-II and Fe-III sublattices to external stimuli. More interestingly, the exchange anisotropy between the two sublattices can also give rise to tunable positive and negative exchange bias fields. Straightforwardly, such diverse demonstrations of bistability in one single material (depending on the specific tuning way) will provide extra freedom and flexibility for the design of switcher devices.
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