Development and Application cf Bistability in Molecule-based Magnetic Mterials

分子磁性材料双稳态的开发与应用

• 批准号: 13304054
• 负责人: AWAGA Kunio
• 金额: $ 34.44万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13304054/
• 关键词: Molecular magnetism; Bistability; nanomagnet; Single Molecule Magnet; 双安定性; 分子磁性体; 有機ラジカル; 高スピン金属クラスター; 量子効果

The science and technology of spin electronic devices have attracted much interest. In this project, we developed molecule-based magnetic materials for future spintronics.1)Thiazyl radicals possess chemical stability and strong intermolecular interactions. We carried out a systematic study, namely, chemical syntheses, structural analyses, and physical measurements on this radical family, and discovered room-temperature magnetic bistability, photo-induced phase transition, organic ferromagnetism, etc.2)Development of molecular-/nano-magnets is a key issue for spintronics. Some of transition-metal cluster complexes exhibit a hysteresis loop on magnetization curve, so that they are called single molecule magnets(SMM). In this project, we performed chemical modifications on SMM, in order to elucidate the magneto-structural correlation and to control the classical and quantum magnetic relaxations. The magneto-structural correlation in SMM was revealed.We also developed synthesis of novel nanomagnets. We succeeded in uniform coating of polystyrene beads (O.D.300-1000 nm) with cobalt hydroxides, and obtained spherical hollow nanomagnets of fee Co and spinel Co_3O_4.

旋转电子设备的科学和技术引起了极大的兴趣。在这个项目中，我们开发了用于未来旋转的分子的磁性材料。1）噻唑自由基具有化学稳定性和强烈的分子间相互作用。我们进行了一项系统的研究，即对这个激进家族的化学合成，结构分析和物理测量，并发现了室温的磁性磁性，光诱导的相变，有机铁磁剂等。2）开发分子 - /nano-magnets的发展是用于旋转的关键问题。某些过渡金属簇复合物在磁化曲线上表现出滞后环，因此它们被称为单分子磁铁（SMM）。在这个项目中，我们对SMM进行了化学修饰，以阐明磁结构相关性并控制经典和量子磁性弛豫。 SMM中的磁结构相关性已显示出来。我们还开发了新型纳米磁体的合成。我们与氢氧化钴的聚苯乙烯珠（O.D.300-1000 nm）的均匀涂层成功，并获得了Fee Co和Spinel CO_3O_4的球形空心纳米磁铁。

项目成果

K.Takeda, K.Awaga, T.Inabe, A.Yamaguchi, H.Ishimoto, T.Tomita, H.Mitamura, T.Goto, N.Mon, H.Nojiri: "Magnetic anisotropy, tunneling effects, high-frequency EPR, and molecular structure offast-relaxation species of Mn-12"Phys.Rev. B65. 094424 (2002)

K.Takeda、K.Awaga、T.Inabe、A.Yamaguchi、H.Ishimoto、T.Tomita、H.Mitamura、T.Goto、N.Mon、H.Nojiri：“磁各向异性、隧道效应、高频

Magnetic anisotropy, tunneling effects, high-frequency EPR, and niolecular structure of fast-relaxation species of Mn_<12>

Mn_<12>快弛豫物质的磁各向异性、隧道效应、高频EPR和纳米分子结构

• 发表时间: 2002
• 期刊: Phys.Rev.B 65
• 作者: K.Takeda;K.Awaga;T.Inabe;A.Yamaguchi;H.Ishimolo;T.Tomita;H.Mitamura;T.Goto;N.Mori;H.Nojiri
• 通讯作者: H.Nojiri

T. Otsuka, M. Yoshimaru, K. Awaga, H. Imai, T. Inabe, N. Wada, M. Ogata: "Magnetic Conversion Induced by Non-Magnetic Impurities in a Molecular Spin Ladder System, ρ-EPYNN・[Ni(dmit)_2]"J. Phys. Soc. Japan. 70. 2711-2716 (2001)

T. Otsuka、M. Yoshimaru、K. Awaga、H. Imai、T. Inabe、N. Wada、M. Ogata：“分子自旋梯系统中非磁性杂质诱导的磁转换，ρ-EPYNN·[Ni (dmit)_2]“日本物理学会杂志。70. 2711-2716 (2001)

T. Akutagawa, N. Takamatsu, K. Shitagami, T. Hasegawa, T. Nakamura, T. Inabe, W. Fujita, K. Awaga: "Diversity in the 1/2 spin arrangement of [Ni(dmit)_2] anions in divalent Ca^<2+>(crown ether) supramolecular cation salts"J. Mater. Chem.. 11. 2119-2125 (2

T. Akutakawa、N. Takamatsu、K. Shitagami、T. Hasekawa、T. Nakamura、T. Inabe、W. Fujita、K. Awaga：“[Ni(dmit)_2] 阴离子 1/2 自旋排列的多样性

Magnetic anisotropy, tunneling effects, high-frequency EPR, and molecular structure of fast-relaxation species of Mn_<12>

Mn_<12>快弛豫物质的磁各向异性、隧道效应、高频EPR和分子结构

• 发表时间: 2002
• 期刊: Phys.Rev. B65
• 作者: K.Takeda;K.Awaga;T.Inabe;A.Yamaguchi;H.Ishimoto;T.Tomita;H.Mitamura;T.Goto;N.Mori;H.Nojiri
• 通讯作者: H.Nojiri