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ESR Study on Molecular Salt (Benzo-TTFVS)2MBr4 (M = Fe, Ga)
Shuichi Kawamata,Takekazu Ishida,Taro Hayakawa,Takashi Hiraoka,Hideki Fujiwara,Toyonari Sugimoto 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
Electron spin resonance (ESR) experiments on (Benzo-TTFVS)2MBr4 (M = Fe, Ga) have been done with 15.4 GHz microwaves, where Benzo-TTFVS denotes a new donor molecule substituted with a benzo group, benzotetrathiafulvalenothioquinone-1,3-dithiolemethide. The temperature and the magnetic-field-direction dependencies of the effective g-value and the linewidth are obtained. In (Benzo-TTFVS)2GaBr4 (Ga salt), the ESR signals are due to π-electrons while they originate from d-electrons at the Fe3+ ion in the case of (Benzo-TTFVS)2FeBr4 (Fe salt). The g-value and the linewidth for the direction of the π-d correlation are dierent from those for other directions in the Fe salt. A strong antiferromagnetic fluctuation related to the π-d correlation is observed in the Fe salt. On the other hand, in the Ga salt, the magnetic-eld-direction dependencies of the g-value and the linewidth re ect the anisotropy of the one-dimensional conduction band. The importance of the π-d correlation is proved by comparing the ESR results for the Fe salt with those for the Ga salt. Electron spin resonance (ESR) experiments on (Benzo-TTFVS)2MBr4 (M = Fe, Ga) have been done with 15.4 GHz microwaves, where Benzo-TTFVS denotes a new donor molecule substituted with a benzo group, benzotetrathiafulvalenothioquinone-1,3-dithiolemethide. The temperature and the magnetic-field-direction dependencies of the effective g-value and the linewidth are obtained. In (Benzo-TTFVS)2GaBr4 (Ga salt), the ESR signals are due to π-electrons while they originate from d-electrons at the Fe3+ ion in the case of (Benzo-TTFVS)2FeBr4 (Fe salt). The g-value and the linewidth for the direction of the π-d correlation are dierent from those for other directions in the Fe salt. A strong antiferromagnetic fluctuation related to the π-d correlation is observed in the Fe salt. On the other hand, in the Ga salt, the magnetic-eld-direction dependencies of the g-value and the linewidth re ect the anisotropy of the one-dimensional conduction band. The importance of the π-d correlation is proved by comparing the ESR results for the Fe salt with those for the Ga salt.
Optimal Design of Multi-Dimensional Recursive Digital Filters Using a Simple Genetic Algorithm
Higuchi, Tatsuo,Kawamata, Masayuki,Imakubo, Jun 대한전자공학회 1994 ISPACS:Intelligent Signal Processing and Communica Vol.1 No.1
This paper proposes an optimal design method of multi-dimensional recursive digital filters (MDDFs) based on a simple genetic algorithm (SGA) for frequency-domain specifications. Design problem is formulated both in general class and in separable-denominator (SD) class. Parameters of the transfer function of a M-DDF are encoded to hit strings in order to apply a SGA to the design. The proposed method has flexibility for change of specifications of M-DDFs and for error functions used in optimization. The solution obtained by the proposed method can be also a good initial point for traditional optimization methods, for example, the DFP method. The effectiveness of the proposed method is demonstrated by design examples.
Higuchi, Tatsuo,Kawamata, Masayuki,Yoshie, Tomotaka 대한전자공학회 1994 ISPACS:Intelligent Signal Processing and Communica Vol.1 No.1
This paper proposes parallel separable (PS) two-dimensional (2-D) adaptive filters. Their adaptation algorithms are formulated and their computational complexities are estimated. They are applied to 2-D identification for comparison of the proposed adaptive filter and a conventional 2-D adaptive filter. A PS 2-D recursive adaptive filter and a 1PS 2-D non-recursive adaptive filter are realized in the form of the 2-D adaptive line enhancer, and they are applied for restoration of noisy images.