Study on the origin of induced magnetic anisotropy of metal-insulator nano-granular soft-magnetic film by small-angle X-ray and neutron scattering

小角X射线和中子散射研究金属绝缘体纳米颗粒软磁薄膜感应磁各向异性的起源

• 批准号: 18360340
• 负责人: MASATO Ohnuma
• 金额: $ 6.8万
• 依托单位: National Institute for Materials Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18360340/
• 关键词: soft-magnetic materials; induced magnetic anisotropy; small-angle scattering; neutron scattering; quantum beam; 磁性; 複合材料・物性

For achieving high density and fast electronic devices, soft magnetic materials with high-magnetic permeability at the GHz frequency regions are required. Nano-granular soft-magnetic films are one of the promising candidates because of their high saturation magnetization, large resistivity and large induced magnetic anisotropy field, Hk, that sometimes exceed 200 Oe. Except large Hk, the origin of the properties is attribute to the microstructure which consists of almost pure Co and Si-O base amorphous matrix. Elk also shows weak dependence of the average particle size, however, no microstructural anisotropy has been found yet. For full understanding of the origin of anisotropy, it is needed to know the magnetization process in the field smaller than Hk. For this purpose, we use small-angle neutron scattering (SANS). Our findings are follows;1. Intensity maximum in SANS appears parallel to the major axis of magnetization. This indicates the existence of minor contribution of magnetizat … More ion which lies perpendicular direction to the major magnetization axis.2. By applying magnetic field perpendicular to easy axis, the intensity maximum rotate continuously to the external field, indicating the minor contribution also rotate together with major component of magnetization.3. The size of the magnetic domain of minor component is changed by the external field. Larger in the small field and smaller in the field close to the Bk. Latter ease, it is about 10 nm which is still larger than the particle size (〜3nm). Magnetic domain size of the major component is larger than a few thousand nm that is the maximum size of our SANS measurements. Therefore, it indicates the existence of hierarchical structure in the magnetic domain.Such of hierarchical structure in the magnetic domain has never reported in the soft-magnetic materials. Hence it can be a key factor for showing large Bk. For confirming it, we are now conducting further experiments using stronger neutron source which starts from Dec. 2008. Less

为了实现高密度和快速电子器件，需要在GHz频率区域具有高磁导率的软磁材料。纳米颗粒软磁薄膜具有高的饱和磁化强度、大的电阻率和大的感生磁各向异性场（Hk）（有时超过200 Oe），是最有希望的候选材料之一。除了Hk大之外，其主要原因是由几乎纯的Co和Si-O基非晶基体组成的微结构。埃尔克还显示出弱的平均粒径的依赖性，然而，没有微观结构的各向异性已被发现。为了充分理解各向异性的起源，需要知道小于Hk的磁场中的磁化过程。为此，我们使用小角中子散射（SANS）。研究结果如下：1. SANS的强度最大值平行于磁化主轴。这表明磁化强度的贡献很小， ...更多信息 离子位于垂直于主磁化轴的方向。施加垂直于易磁化轴的磁场后，强度最大值随外场连续旋转，说明次要贡献也随磁化强度的主要分量一起旋转.磁场的作用改变了小分量磁畴的大小。在小场中较大，在靠近Bk的场中较小。后一种情况下，它约为10 nm，仍大于颗粒尺寸（约3 nm）。主要成分的磁畴尺寸大于几千nm，这是我们SANS测量的最大尺寸。因此，这表明磁畴中存在着分级结构，这种磁畴分级结构在软磁材料中还从未有过报道。因此，它可能是显示大Bk的关键因素。为了证实这一点，我们正在从2008年12月开始使用更强的中子源进行进一步的实验。少

项目成果

Brillouin light scattering from TM-AI-O granular films(TM=Co, Fe)

TM-AI-O颗粒薄膜的布里渊光散射(TM=Co, Fe)

• 发表时间: 2007
• 期刊: J. Magn. Magn. Mat. 310
• 作者: A. Yoshihara;S. Ohnuma;H. Fujimori
• 通讯作者: H. Fujimori

偏極中性子小角散乱法によるナノ結晶軟磁性材料の磁化過程の検討

极化中子小角散射法研究纳米晶软磁材料的磁化过程

• 发表时间: 2008
• 作者: 篠原武尚;鈴木淳市;大沼正人;奥隆之;大沼繁弘
• 通讯作者: 大沼繁弘

Magnetic properties of Cobalt based nano-ganular soft magnetic fims

钴基纳米颗粒软磁薄膜的磁性能

• 发表时间: 2006
• 作者: H. Mamiya;S. Ohnuma;M. Ohnuma;T. Furubayashi;H. Fujimori
• 通讯作者: H. Fujimori

Observation of an extended magnetic field penetration in amorphous superconducting MoGe films

• DOI: 10.1103/physrevb.77.052503
• 发表时间: 2008-02-01
• 期刊: PHYSICAL REVIEW B
• 影响因子: 3.7
• 作者: Nishio, Taichiro;Okayasu, Satoru;Kadowaki, Kazuo
• 通讯作者: Kadowaki, Kazuo

Comparison of field-cooled,zero-field-cooled, and thermoremanent magnetization in nanomagnet, random magnet, and bulk ferromagnet

纳米磁体、随机磁体和块体铁磁体的场冷却、零场冷却和热剩磁的比较

• 发表时间: 2007
• 期刊: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 316
• 作者: Mitsutaka Sato;Rong Tu and Takashi Goto;Meiyong Liao;H.Gao,S.Toh.S.Matsumura,S.Abe S.Ohnuma;河原弘治;S.Ohnuma,M.Ohnuma,H.Fujimori,T.Masumoto;北浦祐太;Meiyong Liao;A.Yoshihara,S.Ohnuma,H.Fujimori;Y. Koide;T.Takasugi;H.Mamiya,S.Nimori,,M.Ohnuma,I.Nakatani,M.Demura,T.Furubayashi
• 通讯作者: H.Mamiya,S.Nimori,,M.Ohnuma,I.Nakatani,M.Demura,T.Furubayashi