Fundamental studies for high temperature organic ferromagnet

高温有机铁磁体的基础研究

• 批准号: 11304052
• 负责人: KINOSHITA Minoru
• 金额: $ 20.99万
• 依托单位: Science University of Tokyo in Yomaguchi
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11304052/
• 关键词: organic ferromagnet; exchange interaction; interaction among electron spins; ferrimagnetism; TCNQ complexes; biradicals; electrical conductivity; TCNO錯体; フェリ磁性体; TCNQ錯体磁性; 分子間交換相互作用; 分子内交換相互作用; Cs_2(TCNQ)_3錯体の磁性; [N(CH_3)_4]_2(TCNQ)_3錯体の磁性

First of all, a new instrument (SQUID magnetometer) was introduced, and its ability was checked with a standard sample. Then, the magnetic properties of some TCNQ complexes were examined, because those complexes were reported to exhibit ferromagnetism even at room temperature. Several trials with carefully prepared samples under argon atmosphere led us to the conclusion that the ferromagnetism reported is erroneous, The magnetic properties of several stable biradicals based on nitronyl nitroxide were also investigated for the purpose to invent an organic ferrimagnet. Although interesting magnetic behavior was found on some biradical crystals, no ferrimagnet has been obtained. Another approach for a high critical temperature ferromagnet was also checked on some conducting organic solids, but no successful result has been observed until now. Further investigation on these lines is indispensable. On the other hand, the SQUID magnetometer has been modified for the measurements of temperature dependence of electrical conductivity and magnetoresistance, because the instrument is equipped with a good temperature control unit and a power supply for a high magnetic field. This trial seems to be successful and will be used further investigation on a magnetic-electrical composite materials.

首先，引入了一种新仪器（Squid磁力计），并使用标准样本检查其能力。然后，检查了某些TCNQ复合物的磁性，因为据报道这些复合物甚至在室温下也表现出铁磁性。在氩气大气下进行精心准备的样品的几项试验使我们得出了这样的结论：报告的铁磁性是错误的，还研究了基于硝基硝基氧化物的几种稳定的Biradicals的磁性特性，目的是发明有机铁磁铁。尽管在某些Biradical晶体上发现了有趣的磁性行为，但尚未获得Ferrimagnet。还检查了一些有机固体的高临界温度铁磁铁的另一种方法，但迄今尚未观察到成功的结果。对这些线路的进一步研究是必不可少的。另一方面，已经对鱿鱼磁力计进行了修改，以测量电导率和磁场的温度依赖性，因为该仪器配备了良好的温度控制单元和高磁场的电源。该试验似乎是成功的，将进一步对磁性复合材料进行进一步研究。

项目成果

M.Kinoshita: "p-nitrophenyl nitronyl nitroxide:the first organic ferromagnet."Philosophical Transactions of the Royal Society. 357(1762). 2855-2872 (1999)

M.Kinoshita：“对硝基苯基硝基硝基氧：第一个有机铁磁体。”英国皇家学会哲学汇刊。

Xingguo Chen: "Nanocomposite system of N-methylstilbazoliums intercalated into lamellar FePS_3"Synthetic Metals. 121. 1307-1308 (2001)

陈兴国：“N-甲基芪唑嵌入层状 FePS_3 的纳米复合体系”合成金属。

Xingguo, Chen..Chuluo, Yang..Jingui, Qin.Makoto, Inokuchi.Yohei, Fujii.Minoru, Kinoshita.Kyuya, Yakushi.Kenji, Ichimura. And Yunqi, Liu q: "Nanocomposity system of N-methyl-stillazoliums intercalated into lamellar FePS_3"Synthetic Metals. 121. 1307-1308 (

兴国、陈..楚罗、杨..金贵、秦.诚、井之口.阳平、藤井.稔、木下.九也、药师.健二、市村。

M, Kinoshita.: "p-Nitrophenyl nitronyl nitroxide : the first organic ferromagnet"Philosophical Transactions of the Royal Society, London, series A. 357(1762). 2855-2872 (1999)

M，Kinoshita.：“对硝基苯基硝基硝基氧：第一个有机铁磁体”英国皇家学会哲学汇刊，伦敦，系列 A.357（1762）。

K, Awaga. And M, Kinoshita: "Magnetism of organic radical crystals"ditto. 170-189 (2000)

K，阿瓦加。