A Ferroelectric Metallomesogen Exhibiting Field-Induced Slow Magnetic Relaxation |
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| Authors: | Dr Ryohei Akiyoshi Hikaru Zenno Dr Yoshihiro Sekine Dr Manabu Nakaya Prof Motoko Akita Dr Daisuke Kosumi Prof Leonard F Lindoy Prof Shinya Hayami |
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| Institution: | 1. Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto, 860-8555 Japan;2. Department of Chemistry, Faculty of Science, Josai University, 1-1 Keyakidai, Sakado, Saitama, 350-0295 Japan;3. Graduate School of Material Science, Josai University, 1-1 Sakado, Saitama, 350-0295 Japan;4. Department of Physics, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto, 860-8555 Japan;5. School of Chemistry F11, The University of Sydney, Sydney, NSW 2006 Australia |
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| Abstract: | Magnetoelectric (ME) materials exhibiting coupled electric and magnetic properties are of significant interest because of their potential use in memory storage devices, new sensors, or low-consumption devices. Herein, we report a new category of ME material that shows liquid crystal (LC), ferroelectric (FE), and field-induced single molecule magnet (SMM) behaviors. Co(II) complex incorporating alkyl chains of type Co(3C16-bzimpy)2](BF4)2 ( 1 ; 3C16-bzimpy=2,2’-(4-hexadecyloxy-2,6-diyl)bis(1-hexadecyl-1H-benzod]imidazole)) displayed a chiral smectic C mesophase in the temperature range 321 K–458 K, in which distinct FE behavior was observed, with a remnant polarization (88.3 nC cm−2). Complex 1 also exhibited field-induced slow magnetic relaxation behavior that reflects the large magnetic anisotropy of the Co(II) center. Furthermore, the dielectric property of 1 was able to be tuned by an external magnetic field occurring from both spin-lattice coupling and molecular orientational variation. Clearly, this multifunctional compound, combining LC, FE, and SMM properties, represents an entry to the development of a range of next-generation ME materials. |
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| Keywords: | cobalt(II) complexes ferroelectricity liquid crystal magnetoelectric coupling slow magnetic relaxation |
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