Soft magnetic properties appeared in magnetic granular system with frustrated interactions between the particles

磁性颗粒系统中出现软磁特性，颗粒之间的相互作用受阻

• 批准号: 13650003
• 负责人: ISHII Kiyoshi
• 金额: $ 1.98万
• 依托单位: Utsunomiya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650003/
• 关键词: Granular magnetic material; Magnetic particle; Coercivity; Soft magnetic property; Magnetic thin film; Super-paramagnetism; Super-ferromagnetism; 磁性体; 磁性材料; スパッタ膜; クラスター堆積

In nanogranular magnetic system, the magnetic properties are strongly dominated by the magnetic interactions between magnetic particles. The production method of nanogranular materials ever used has not enabledthe independent control of the size and density of the magnetic particles in granular sample. On the other hand, the cluster deposition method used in this work allows such an independent contol. Fe clusters with the mean diameter of about 5nm could be embedded in Ag matrix over wide concentration by the method. The relationship between the magnetic properties and the concentration of Fe particles was investigated. The results are summarized as follows.1. Fe clusters with the mean diameter of about 5nm were well dispersed in Ag matrix.2. Interparticle magnetic interaction became strong with increasing the particle density in Fe/Ag system.3. Avery low coercive force of about 0.5 Oe was observed in the Fe/Ag film with Fe content of 30 at%. Such a low coercivity has never been observed in granular system.4. For the samples with low coercivities, magnetic behavior was well described by a Curie-Weiss-like law. The lowest coercive force was observed for the samples with the Fe concentration where super-paramagnetic behavior changed to ferromagnetic behavior.

在纳米颗粒磁性体系中，磁性颗粒之间的相互作用强烈地控制着磁性。现有的纳米颗粒材料的制备方法不能独立控制颗粒样品中磁性颗粒的尺寸和密度。另一方面，在这项工作中使用的集群沉积方法允许这样一个独立的控制。该方法可以在较宽的浓度范围内将平均直径约为5 nm的Fe团簇嵌入到Ag基体中。研究了磁性与Fe颗粒浓度的关系。研究结果如下：1. Fe团簇在Ag基体中分散良好，平均粒径约为5 nm.在Fe/Ag体系中，随着粒子密度的增加，粒子间的磁相互作用增强.当Fe含量为30at%时，Fe/Ag薄膜的矫顽力很低，约为0.5Oe。在颗粒体系中从未观察到如此低的介电常数.对于低磁化率的样品，磁行为很好地描述了居里-外斯定律。在Fe浓度为超顺磁性转变为铁磁性的情况下，样品的矫顽力最低。

项目成果

K.Ishii, Y.Saito, T.Hihara: "Growth of nanocrystalline Fe films by low energy cluster deposition using sputtering"Trans. of MRS-J. (未定). (2003)

K.Ishii、Y.Saito、T.Hihara：“利用溅射法生长纳米晶铁薄膜”，MRS-J (TBD)。

K. Ishii, H. Hamakake: "Prepartion of Magnetic Granular Films by the Co-deposition of Magnetic Clusters and Matrix Vapor Using Gas Flow Sputtering"Proceedings of International Symposium on Cluster Assembled Materials. 42-45 (2001)

K. Ishii，H. Hamakake：“使用气流溅射通过磁簇和基质蒸气共沉积制备磁性颗粒薄膜”簇组装材料国际研讨会论文集。

Prepartion of Magnetic Granular Films by the Co- deposition of Magnetic Clusters and Matrix Vapor Using Gas Flow Sputtering

气流溅射磁簇与基质蒸气共沉积制备磁性颗粒薄膜

• 发表时间: 2001
• 期刊: Proceedings of International Symposium on Cluster Assembled Materials
• 作者: K.Ishii;H.Hamakake
• 通讯作者: H.Hamakake

H. Hamakake, M. Wakairo, M. Ishikawa, K. Ishii: "Paramagnetic-Ferromagnetic Phase Transition in Fe/Ag Nanogranular System"Proceedings of International Symposium on Cluster Assembled Materials. 46-49 (2001)

H. Hamakake、M. Wakairo、M. Ishikawa、K. Ishii：“Fe/Ag 纳米颗粒系统中的顺磁-铁磁相变”簇组装材料国际研讨会论文集。

Growth Nanocrystalline Fe films by Low Energy Cluster Deposition Using Sputtering.

使用溅射的低能量团簇沉积生长纳米晶铁薄膜。

• 发表时间: 2003
• 期刊: Trans.(on MRS-J) (In press)
• 作者: K.Ishii;Y.Saito;T.Hihara
• 通讯作者: T.Hihara