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Magnetic domain structures of 1:12 type nitrides NdFe_(10.5)Mo_(1.5)N_x

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Science China Mathematics 1999年第1期42卷 93-98页

作者：徐海韩宝善杨金波杨应昌 State Key Laboratory of Magnetism Institute of Physics Chinese Academy of Sciences Beijing China Department of Physics Peking University Beijing China

The magnetic domain structures of the 1: 12 type alloy NdFe10.5Mo1.5 and its nitride were firstly investigated by using magnetic force microscope (MFM). A complicated corrugation and spike magnetic domain structure was observed in NdFe10.5Mo1.5 alloy. Upon nitrogenation, a stripe domain structure occurs due to the dramatic increase of the uniaxial magneto-crystalline anisotropy K1 induced by nitrogenation. Based on the basic domain theories, the origin of these domain patterns was analyzed and the reason of domain structure transition is explained quantitatively. The domain wall energy γ, exchange constant A and single-domain particle size Dc of NdFe10.5 Mo1. 5 and NdFe10.5-Mo1.5Nx were calculated in combination with the measured domain width ω and magnetic parameters. A comparison of magnetic parameters with those of SmCo5 and Nd2Fe14B permanent materials was also made.

关键词： rare-earth nitride magnetic force microscopy(MFM) domain structure.

Magnetic Microstructure of Sintered Nd-Fe-B Magnets Made from Casting Strips

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Chinese Physics Letters 2004年第8期21卷 1655-1658页

作者：方以坤朱明刚郭永权李卫韩宝善 StateKeyLaboratoryofMagnetism InstituteofPhysicsChineseAcademyofSciencesBeijing100080 DivisionofFunctionalMaterials CentralIron&SteelResearchInstituteBeijing100081

The magnetic microstructures of two Dy–Al substituted sintered Nd–Fe–B magnets with the different nominal compositions of Nd12.2Dy0.6Fe80.4Al0.7B6 (at.%) (composition-A, C-A) and Nd13.7Dy0.6Fe78.8Al0.7B6.2(at.%) (composition-B, C-B) prepared by strip casting technique have been revealed by using a magnetic force microscope. The magnetic properties of sintered C-B magnets are worse than that of C-A sintered magnets. In particular, the value of density products (BH)max for sintered C-A magnets is about 32% higher than that of C-B magnets, which is reflected by their quite different magnetic microstructures. We believe that for the C-B samples, the inappropriate composition and thus the redundant Nd2Fe17(B) phase of the casting strips make its final magnetic microstructures worse than the C-A, and then deteriorates the performance of the C-B magnets.

关键词： Magnets

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磁暴与华北地区地震活动的关系

西北地震学报 1997年第1期19卷 44-48页

作者：解用明韩宝善河北省地震局

利用了白家疃地磁台地磁月报和７日报中的Ｋ指数资料，将大于５的Ｋ指数全都折合成５的Ｋ指数。对磁暴扰动数Ｎ（Ｋ＝５的个数）和华北地区１９７３～１９９２年的ＭＬ≥５．０地震之间关系进行了统计分析，结果表明，磁暴具有大约１０... 详细信息

利用了白家疃地磁台地磁月报和７日报中的Ｋ指数资料，将大于５的Ｋ指数全都折合成５的Ｋ指数。对磁暴扰动数Ｎ（Ｋ＝５的个数）和华北地区１９７３～１９９２年的ＭＬ≥５．０地震之间关系进行了统计分析，结果表明，磁暴具有大约１０年左右的活跃－平静－活跃的周期变化。在半周期中，从上升年到高值年或从下降年到低值年中最大震级有同量级成对出现的特征；取月磁暴扰动数Ｎ≥４０时为异常，异常后４个月内发生的地震占总地震数的６８％，有震异常占总异常的６１％；震级越大，异常越明显。分别对ＭＬ≥５．０，ＭＬ≥５．５，ＭＬ≥６．０和ＭＬ≥６．３（ＭＳ６．０）的地震进行统计，有异常的地震占相应震级地震数各为６１％、７５％、８９％和１００％。

关键词：磁暴 K指数磁暴相位强震地震活动性

Magnetic Agglomeration Among Nd-Fe-B Particles and Its Influence on Field Aligning

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Chinese Physics Letters 2004年第1期21卷 191-193页

作者：何叶青王震西周寿增张臻蓉韩宝善 BeijingZhongKeSanHuanHigh-TechCo. Ltd.Beijing100080 StateKeyLaboratoryforAdvancedMetalsandMaterials UniversityofScienceandTechnologyBeijingBeijing100083 StateKeyLaboratoryofMagnetism InstituteofPhysicsandCenterofCondensedMatterPhysicsChineseAcademyofSciencesBeijing100080

There exists strong magnetic agglomeration among Nd–Fe–B particles. Due to this effect, an applied field even up to 1350kAm−1 still can not make the loose Nd–Fe–B powders to reach saturated magnetization. SEM images of a little amount of Nd–Fe–B powders were used to illustrate the agglomeration phenomenon. We believe that the general existence of misalignment grains in the magnetic force images of the sintered Nd–Fe–B magnet fabricated by die pressing with 1500kAm−1 aligning field is a confirmation of the magnetic agglomeration.

关键词： Agglomeration

硬磁性Nd_(60)Al_(10)Fe_(20)Co_(10)大块金属玻璃的磁畴结构

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科学通报 2001年第14期46卷 1158-1161页

作者：魏炳忱汪卫华韩宝善张臻蓉潘明祥赵德乾胡文瑞中国科学院力学研究所国家微重力实验室中国科学院物理研究所凝聚态物理中心北京100080 中国科学院物理研究所磁学国家重点实验室凝聚态物理中心中国科学院物理研究所凝聚态物理中心

运用磁力显微镜对硬磁性Ｎｄ６０Ａｌ１０Ｆｅ２０Ｃｏ１０大块金属玻璃（ＢＭＧ）的磁畴结构进行了研究．结果表明，制备态材料中存在黑白磁斑相邻的微磁结构，磁畴的平均尺度约为３６０ｎｍ．这种磁畴结构与Ｎｄ基ＢＭＧ的硬磁性是... 详细信息

运用磁力显微镜对硬磁性Ｎｄ６０Ａｌ１０Ｆｅ２０Ｃｏ１０大块金属玻璃（ＢＭＧ）的磁畴结构进行了研究．结果表明，制备态材料中存在黑白磁斑相邻的微磁结构，磁畴的平均尺度约为３６０ｎｍ．这种磁畴结构与Ｎｄ基ＢＭＧ的硬磁性是紧密相关的．由于ＢＭＧ中存在的短程有序原子团簇的尺度只有几纳米量级，因而磁力图上亚微米尺度的黑白磁斑是由大量的原子团簇在强烈的交换耦合作用下磁矩平行排列形成的．而完全晶化的材料则呈顺磁性，其磁力图上已无明显的磁反差，但仍分布着一些间距较大的平均尺度为９００ｎｍ的低矫顽力铁磁晶态相．

关键词：金属玻璃硬磁性磁力显微镜交换耦合作用磁畴结构铁磁晶态相

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磁泡的动态测量

物理 1979年第4期 294-298页

作者：韩宝善刘英烈于志弘中国科学院物理研究所

前言磁泡材料的畴壁迁移率和磁泡状态的测定是磁泡动态测量的两个重要内容.早先的阶梯函数响应法[1]和磁泡破灭法[2]虽然都能测量畴壁迁移率μω,但用作常规测试都不理想,并且都不能用来确定磁泡的状态. 本文所介绍的脉冲梯度场磁泡... 详细信息

前言磁泡材料的畴壁迁移率和磁泡状态的测定是磁泡动态测量的两个重要内容.早先的阶梯函数响应法[1]和磁泡破灭法[2]虽然都能测量畴壁迁移率μω,但用作常规测试都不理想,并且都不能用来确定磁泡的状态. 本文所介绍的脉冲梯度场磁泡传输法[3],直接测量孤立磁泡在脉冲梯度场中的运动速度,从而测得迁移率.同时又从磁泡的运动方向确定磁泡的状态,方法简便,原理直观,所以这个方法被广泛地应用于常规测试和基础研究. 一、测量原理 1.用脉冲梯度场磁泡传输法测迁移率μω。在梯度为 H的不均匀偏场中,磁泡将受力而沿- H的方向运动.磁泡速度V…

关键词：磁泡材料条状迁移率畴壁金线传输电路磁存贮材料动态测量偏场

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磁力显微镜及磁性涂层表面观测

磁记录材料 1997年第1期15卷 10-12页

作者：孙克冯远冰徐海韩宝善中国科学院

利用原子力显微镜（AFM）和磁力显微镜（MFM）技术初步观测了由单畴或接近单畴的钡钴钛铁氧体BaMxFe12-xO19（M=Co，Ti；x=0．7）颗粒做成的磁性涂层的形貌和表面散磁场的分布状况。同时用振动样品磁强计（VSM）测量了该涂层的退磁曲线... 详细信息

利用原子力显微镜（AFM）和磁力显微镜（MFM）技术初步观测了由单畴或接近单畴的钡钴钛铁氧体BaMxFe12-xO19（M=Co，Ti；x=0．7）颗粒做成的磁性涂层的形貌和表面散磁场的分布状况。同时用振动样品磁强计（VSM）测量了该涂层的退磁曲线。从观测照片上可以看出涂层表面颗粒分布状态和磁场分布情况。

关键词：显微镜磁力显微镜磁性涂层涂层表面观测

Magnetic Force Microscopy Study of Alternate Sputtered （001） Oriented L1o Phase FePt Films

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Chinese Physics Letters 2007年第1期24卷 222-225页

作者：夏爱林曹江伟童六牛魏福林杨正韩宝善 Anhui Key Laboratory of A1eta 1 Alaterials and Processing School of ~1aterials Science and Engineering Anhui University of Technology Maanshan 243002 State Key Laboratory of Magnetism Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100080 Research Institute of Alagnetic A 1aterials Lanzhou University Lanzhou 730000

We present a magnetic force microscopy study of alternate sputtered （001） oriented L1o phase FePt films. It is found that the root-mean-square value of phase shift of magnetic force images, （ △Ф）rms, can be used to characterize the perpendicular anisotropy for a series of specimens. Therefore, the considerable improvement of the perpendicular anisotropy after post-annealing can be characterized. In addition, the magnetic properties, magnetic and crystalline microstructures before and after post-annealing are compared for the typical [Fe5nm Pt5 nm]10 film with substrate temperature T8 = 500℃, single layer thickness d = 5 nm and total layer thickness D=100 nm to confirm the effect of post-annealing on improving the perpendicular anisotropy for Fe-Pt films.

关键词： Magnetic Force Microscopy Study Alternate Sputtered (001) Oriented L1_0 Phase FePt Films

Magnetic domain structures of precipitation-hardened SmCo 2:17-type sintered magnets: Heat treatment effect

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Chinese Physics B 2008年第6期17卷 2281-2287页

作者：李岫梅方以坤郭朝晖刘涛郭永权李卫韩宝善 Division of Functional Materials Research Central Iron & Steel Research Institute State Key Laboratory of Magnetism Institute of Physics and the Center for Condensed Matter Physics Chinese Academy of Sciences

The typical magnetic domains of Sm（CObalFe0.25Cuo.07Zr0.02）7.4 magnets quenched through various heattreatment steps have been revealed by using magnetic force microscopy （MFM）. For the specimens in which the nominal c-axis is perpendicular to the imaging plane, the domain configurations change from plate-like for the as-sintered magnet to corrugation and spike-like for the homogenized one, and then to a coarse and finally to a finer domain structure when isothermally aged at 830℃ and then annealed at 400℃. However, only plate-like domains can be detected on the surfaces with the nominal c-axis parallel to the imaging plane. The finer domain （so-called interaction domain） is a characteristic magnetic domain pattern of the SmCo 2：IT-type magnets with high coercivities. Domain walls in a zigzag shape are revealed by means of MFM in final bulk SraCo 2：17-type sintered magnets.

关键词： Sm-Co permanent magnets magnetic domains heat-treatment magnetic force microscopy