Thermodynamic Studies on Magnetic Properties of Nano-Scaled Magnets

纳米磁体磁性能的热力学研究

基本信息

批准号：
14540534
负责人：
MIYAZAKI Yuji
金额：
$ 1.86万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2005
项目状态：
已结题

项目摘要

Nano-scaled Magnets have been attracting much attention because of not only application such as a new magnetic memory but also academic aspects such as superparamagnetism, magnetic quantum tunneling, and so on. There are two strategies for development of nano-scaled magnets : top-down type and bottom-up type. In this research, I have investigated specific magnetic properties of bottom-up types of the single-molecule magnet [Mn_<12>O_<12>(O_2CPh) _<16>(H_2O)_4] and the single-chain magnet [Mn(saltmen)] _2[Ni(pao)_2(py)_2](ClO_4)_2 and a top-down type of Ni(OH)_2 monolayered nanocluster (Ni-MNC) in amorphous SiO_2.It was revealed by the magnetic-field dependence of the heat capacity of the [Mn_<12>O_<12>(O_2CPh)_<16>(H_2O)_4] crystal that the crystal has a magnetic-field-direction-dependence for the heat capacity and that the heat capacity data can be accounted for well by the spin Hamiltonian for an S=10 spin system with a uniaxial anisotropy. The magnetic-field dependence of the heat capacity of the [Mn(saltmen)]_2[Ni(pao)_2(py)_2](ClO_4)_2 crystal indicated the nature of a one-dimensional antiferromagnet. It was suggested by the magnetic-field dependence of the heat capacity of the Ni-MNC that ferromagnetic interactions exist in the Ni-MNC and among the Ni-MNCs. It was concluded by the estimated magnetic entropy that a broad magnetic thermal anomaly is due to the magnetic ordering of the Ni^<2+> cations with S=1.

纳米尺寸的磁铁一直引起了很多关注，因为不仅应用了新的磁性记忆，还包括超级磁性，磁量子隧穿等学术方面。有两种开发纳米尺寸磁铁的策略：自上而下的类型和自下而上的型号。在这项研究中，我研究了单分子磁铁的自下而上类型的特定磁性[Mn_ <12> O_ <12>（O_2CPH）_ <16>（H_2O）_4]和单链磁铁[Mn（saltmen）_2 [ni（pao）_2（paO）_2（py）_2 and-type ni tpys _2 and a in-tpys _2 and a in-tpy ni（oh）_2在无定形的sio_2中单层纳米组（Ni-MNC）。具有单轴各向异性的S = 10旋转系统的自旋哈密顿量。 [Mn（盐）] _ 2 [ni（pao）_2（py）_2]（clo_4）_2 crystal的热容量的磁场依赖性表示一维抗fiferromagnet的性质。 Ni-MNC的热容量的磁场依赖性提出，铁磁相互作用存在于Ni-MNC和Ni-MNC中。估计的磁熵得出的结论是，宽阔的磁热异常是由于s = 1的Ni^<2+>阳离子的磁顺序。

项目成果

期刊论文数量（25）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Heat capacities of quasi-two-dimensional hetero-spin honeycomb magnets {NBU_4[Cu^<II>Cr^<III>(ox)_3]}_n and {PPh_4[Mn^<II>Cr^<III>(ox)_3]}_n (Bu=n-Butyl, Ph=Pheyl, H_2ox=Oxalic Acid) : High-Temperature Series Expansion Analysis

准二维异质自旋蜂窝磁体{NBU_4[Cu^<II>Cr^<III>(ox)_3]}_n和{PPh_4[Mn^<II>Cr^<III>(ox)的热容

DOI：
发表时间：
2003
期刊：
J.Chem.Phys. 119(13)
影响因子：
0
作者：
M.Sorai;M.Sorai;M.Sorai;Y.Miyazaki;Y.Miyazaki;Y.Miyazaki;Y.Miyazaki;Y.Miyazaki;Y.Miyazaki;T.Akutagawa;S.Ikeuchi;B.Sieklucka;A.Bhattacharjee;T.Hashiguchi;T.Hashiguchi
通讯作者：
T.Hashiguchi

Heat capacities of quasi-two-dimensional hetero-spin honeycomb magnets {NBu_4[Cu^<II>Cr^<III>(ox)_3]}_n and {PPh_4[Mn^<II>Cr^<III>(ox)_3]}_n…

准二维异质自旋蜂窝磁体{NBu_4[Cu^<II>Cr^<III>(ox)_3]}_n和{PPh_4[Mn^<II>Cr^<III>(ox)的热容_3]}_n…

DOI：
发表时间：
2003
期刊：
J. Chem. Phys. 119・13
影响因子：
0
作者：
M.Sorai;M.Sorai;M.Sorai;Y.Miyazaki;Y.Miyazaki;Y.Miyazaki;Y.Miyazaki;Y.Miyazaki;Y.Miyazaki;T.Akutagawa;S.Ikeuchi;B.Sieklucka;A.Bhattacharjee;T.Hashiguchi
通讯作者：
T.Hashiguchi

T.Sakakibara: "Low-Temperature Heat Capacity and One-Dimensional Ferromagnetic Behavior of the Organic Free Radical, 4-Benzylideneamino-2,2,6,6-tetramethylpiperidin-1-oxyl"Journal of Physical Chemistry B. 106(25). 6390-6394 (2002)

T.Sakakibara：“有机自由基4-亚苄基氨基-2,2,6,6-四甲基哌啶-1-氧基的低温热容和一维铁磁行为”物理化学杂志 B.106(25)