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Simultaneous Modulation of Magnetic and Dielectric Transition via Spin‐Crossover‐Tuned Spin Arrangement and Charge Distribution
Authors:Dr. Hui Zheng  Dr. Yin‐Shan Meng  Guang‐Li Zhou  Prof. Chun‐Ying Duan  Prof. Osamu Sato  Prof. Shinya Hayami  Prof. Yi Luo  Prof. Tao Liu
Affiliation:1. State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, China;2. Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka, Japan;3. Institute of Pulsed Power Science, Kumamoto University, Chuo-ku, Kumamoto, Japan
Abstract:Magnetic and dielectric properties have been tuned simultaneously by external stimuli with rapid and sensitive response, which is crucial to monitor the magnetic state via capacitive measurement. Herein, positive charged FeII ions were linked via negative charged [(Tp)FeIII(CN)3]? (Tp=hydrotris(pyrazolyl)borate) units to form a neutral chain. The spin‐crossover (SCO) on FeII sites could be sensitively triggered via thermal treatment, light irradiation, and pressure. SCO switched the spin state of the FeII ions and antiferromagnetic interactions between FeIII and FeII ions, resulting in significant change in magnetization. Moreover, SCO induced rotation of negative charged [(Tp)FeIII(CN)3]? units, generating dielectric anomaly due to geometric change of charges distribution. This work provides a rational way to manipulate simultaneous variations in magnetic and dielectric properties utilizing SCO as an actuator to tune spin arrangement, magnetic coupling, and charge distribution.
Keywords:coordination chemistry  iron  magnetic interactions  multifuntional materials  spin-crossover complexes
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