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A Niccolite Structural Multiferroic Metal–Organic Framework Possessing Four Different Types of Bistability in Response to Dielectric and Magnetic Modulation
Author(s) -
Zhao JiongPeng,
Xu Jian,
Han SongDe,
Wang QingLun,
Bu XianHe
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201606966
Subject(s) - materials science , multiferroics , condensed matter physics , dielectric , exchange bias , bistability , phase transition , modulation (music) , magnetization , transition metal , anisotropy , magnetic field , magnetic anisotropy , ferroelectricity , optoelectronics , optics , physics , chemistry , organic chemistry , quantum mechanics , acoustics , catalysis
Multiple switchable physical properties have been demonstrated in one single niccolite structural metal–organic framework, [(CH 3 CH 2 ) 2 NH 2 ][Fe III Fe II (HCOO) 6 ] ( 1 ), including (i) a reversible ferroelastic phase transition triggered by freezing the disordered (CH 3 CH 2 ) 2 NH 2 + 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.