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A new type of longitudinally driven GMI effect of FeCo-based alloy

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Chinese Science Bulletin 2008年第3期53卷 329-334页

作者： man qikui FANG YunZhang SUN HuaiJun YE FangMin College of Mathematics Physics and Information Engineering Zhejiang Normal University Jinhua 321004 China

On investigating the longitudinally driven GMI effect of the DC annealed Fe36Co36Nb4Si4.8B19.2 alloy rib-bon,the current density was 3.2×107 A/m2,the GMI effect responds sensitively(the sensitivity is as high as 2440.2%/(A.m?1))to weak magnetic field after a 600-second *** experimental result shows that the sensitivity is closely related to annealing current density,driven current frequency and eroded thickness.

关键词：铁钴合金退火敏感性磁畴结构

Ultrathin, flexible, and high-strength Ni/Cu/metallic glass/Cu/Ni composite with alternate magneto-electric structures for electromagnetic shielding

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Journal of Materials Science & Technology 2021年第22期81卷 43-50页

作者： Zenan Ma Jiawei Li Jijun Zhang Aina He Yaqiang Dong Guoguo Tan Mingqiang Ning qikui man Xincai Liu Faculty of Materials Science and Chemical Engineering Ningbo UniversityNingbo315211China CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology&EngineeringChinese Academy of SciencesNingbo315201China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu610054China

Electromagnetic interference(EMI)shielding materials with ultrathin,flexible,superior mechanical and thermal management properties are highly desirable for smart and wearable ***,ultrathin and flexible Ni/Cu/metallic glass/Cu/Ni(Ni/Cu/MG)multilayer composite with alternate magnetic and electrical structures was designed via facial electroless plating of Cu and Ni on an Fe-based metallic *** resultant 0.02 mm-thick Ni/Cu/MG composite displays a superior EMI shielding effectiveness(EMI SE)of 35 dB and a great EMI SE/t of 1750 dB/mm,which is greater than those of composites with monotonous multilayer or homogeneous *** improved EMI SE originates from the massive ohmic losses,the enhanced internal reflection/absorption,and the abundant interfacial polarization ***,Ni/Cu/MG exhibits a high tensile strength of up to 1.2 GPa and outstanding mechanical stability,enabling the EMI SE remains unchanged after 10,000 times of ***,Ni/Cu/MG has excellent Joule heating characteristics and thermal stability,which is very suitable for heating components of wearable hyperthermia devices.

关键词： Electromagnetic shielding Thermal management Mechanical properties Fe-based metallic glasses Alternate magnetic and electrical structures

AFM research on the mechanism of Fe-based alloy stress annealed inducing magnetic anisotropy

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Science China(Technological Sciences) 2008年第9期51卷 1409-1424页

作者： FANG YunZhang ZHENG JinJu SHI FangYe WU FengMin SUN HuaiJun LIN GenJin YANG XiaoHong man qikui YE FangMin College of Mathematics Physics and Information EngineeringZhejiang Normal UniversityJinhua 312004China Chemical and Physics Institute Zhejiang Normal UniversityJinhua 321004China Jinhua Vocational College Jinhua 321000China

The cross-section of the Fe-based alloy (Fe73.5Cu1Nb3Si13.5B9) ribbon annealed at 540°C under various tensile stress was investigated with atomic force microscope (AFM). The stress effect mechanism in Fe-based alloy ribbon tensile stress annealed inducing transverse magnetic anisotropy field was studied using the X-ray diffraction spectra and longitudinal drive giant magneto-impedance effect curves, and the model of direction dominant in encapsulated grain agglomeration was established. The relationship between the direction dominant in encapsulated grain agglomeration and magnetic anisotropy field was disclosed.

关键词： stress annealing nanocrystalline agglomeration AFM magnetic anisotropy

AFM research on Fe-based nanocrystal crystallization mechanism

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Science China(Technological Sciences) 2008年第1期51卷 46-57页

作者： FANG YunZhang WU FengMin ZHENG JinJu SHI FangYe WU WenHui SUN HuaiJun LIN GenJin man qikui HU JuanMei YANG XiaoHong College of Mathematics Physics and Information EngineeringZhejiang Normal UniversityJinhua 312004China Chemical and Physics Institute Zhejiang Normal UniversityJinhua 321004China Jinhua Vocational College Jinhua 321000China

The cross-section pattern of Fe-based alloy ribbon (Fe73.5Cu1Nb3Si13.5B9) annealed at different temperatures was investigated by AFM (atomic force microscope), and the effect mechanism of Nb and Cu in Fe-based alloy ribbon annealing was analyzed with XRD diffraction crystal analysis technique and other research results. New concepts of encapsulated grain, Nb vacancy cluster, Nb-B atom cluster and so on were proposed and used to describe the formation mechanism of α-Fe (Si) nanocrystal. Finally, a three-phase (separation phase, encapsulated phase and nanocrystalline phase) interconnected structure model in Fe-based nanocrystalline alloy was established.

关键词： amorphous crystallization nanocrystal AFM three-phase structure model

Magnetic-electric composite coating with oriented segregated structure for enhanced electromagnetic shielding

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Journal of Materials Science & Technology 2022年第1期96卷 11-20页

作者： Jijun Zhang Zexuan Wang Jiawei Li Yaqiang Dong Aina He Guoguo Tan qikui man Bin Shen Junqiang Wang Weixing Xia Jun Shen Xin-min Wang CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China University of Chinese Academy of Sciences Beijing 100049China Ningbo Key Laboratory of Polymer Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China

manipulation of the internal architecture is essential for electromagnetic interference(EMI)shielding performance of metal-based coatings,which can address the electromagnetic pollution in large-size,complex geometries,and harsh *** this work,oriented segregated structure with conductive networks embedded in magnetic matrix was achieved in Fe-based amorphous coatings via Ni-Cu-P functionalization of(Fe_(0.76)Si_(0.09)B_(0.1)P_(0.05))_(99)Nb_(1)amorphous powder precursors and then thermal spraying them onto aluminum(Al)*** from the unique magnetic-electric structure,the coating@Al composite delivered prominent EMI shielding *** EMI shielding effectiveness(SE)of modified coating@Al composite is~41 dB at 8-12 GHz,doubling the value of Al substrate and is 15 dB greater than that of Ni-Cu-P-free coating@Al *** analysis showed that the introduced Ni−Cu−P insertions forcefully suppress the serious oxidation of the magnetic precursors during thermal spraying and form a dense conductive network in the magnetic *** holography observation and electromagnetism simulation clarified that the modified coating can effectively trap and attenuate the incident radiations because of the electric loss from Ni−Cu−P conductive network,magnetic loss from Fe-based amorphous coating,and the electromagnetic interactions in the oriented segregated ***,the optimized thermal isolation and mechanical properties brought by structural improvement enable the coating to shield complex parts in thermal shock and mechanical loading *** work gives an insight on the design strategies for metal-based EMI shielding materials and enriches the fundamental understanding of EMI shielding mechanisms.

关键词： Fe-based amorphous coatings Ni-Cu-P Oriented segregated structure Electromagnetic shielding

Effect of Nb Addition on the Glass-forming Ability, Soft-magnetic Properties and Mechanical Properties of CoFeNiBSiNb Bulk Glassy Alloys

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Effect of Nb Addition on the Glass-forming Ability, Soft-mag...

Fe_(36)Co_(36)Nb_4Si_(4.8)B_(19.2)合金带巨磁阻抗效应研究

中国材料大会2012

作者： Yaqiang Dong qikui man Baolong Shen Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology ＆ Engineering Chinese Academy of Sciences

ISBN: (纸本)9783037856079

The effect of Nb addition on the glass-forming ability （GFA）, soft-magnetic properties and mechanical properties of [（Co0.65Fe0.35）0.9Ni0.1]73-xB21.9Si5.1Nbx （x=3-6） alloy system were investigated. The results showed that by adjusting the content of Nb, the thermal stability of the supercooled liquid and the GFA increased effectively. With increasing the amount of Nb, the supercooled liquid region （ΔTx ） increased from 45 to 65 K and the reduced glass transition temperature （Trg =Tg /Tl ） was located in the range of 0.584-0.644. As a result, the [（Co0.65Fe0.35 ）0.9Ni0.1 ]73-xB21.9si5.1 Nb x bulk glassy alloys （BGAs） with diameters up to 5.0 mm were produced by copper mold casting. In addition to the high GFA, the Co-based glassy alloys exhibited excellent soft-magnetic properties, i.e., saturation magnetization of 0.53-0.81 T, low coercive force of 0.51-1.75 A/m, and high effective permeability of （1.52-2.53）×104 at 1 kHz under a field of 1 A/m. Besides, the Co-based BGAs also exhibited super high fracture strength of 4270-4490 MPa and vickers hardness of 1127-1182.

关键词： Supercooled liquid region Glass-forming ability Soft-magnetic properties Mechanical property

来源： cnki会议评论

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浙江师范大学学报（自然科学版） 2008年第1期31卷 51-54页

作者：满其奎方允樟林根金孙怀君叶方敏浙江师范大学数理与信息工程学院浙江金华321004

在Fe36Co36Nb4Si4.8B19.2非晶合金中发现明显巨磁阻抗效应,最大磁阻比达到35.9%,并利用直流电流退火对样品进行热处理.实验表明:电流密度为35 A/mm2时退火600 s灵敏度得到大幅提高,达到0.0067/(A.m-1);适当大小的张应力电流退火有效地... 详细信息

在Fe36Co36Nb4Si4.8B19.2非晶合金中发现明显巨磁阻抗效应,最大磁阻比达到35.9%,并利用直流电流退火对样品进行热处理.实验表明:电流密度为35 A/mm2时退火600 s灵敏度得到大幅提高,达到0.0067/(A.m-1);适当大小的张应力电流退火有效地提高了磁阻比幅度.

关键词：大块非晶巨磁阻抗电流退火应力退火

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金属电磁屏蔽材料的研究进展

宁波大学学报（理工版） 2022年第4期35卷 93-108页

作者：黎嘉威马泽南贺爱娜董亚强满其奎刘新才中国科学院宁波材料技术与工程研究所中国科学院磁性材料与器件重点实验室浙江宁波315201 宁波大学材料科学与化工学院浙江宁波315211

电磁屏蔽是抑制电磁干扰并实现电磁兼容的重要技术手段.金属材料是目前应用最广泛的电磁屏蔽材料,随着5G通信、物联网、智能消费电子等领域的快速发展,金属材料在电磁屏蔽材料领域的应用趋于轻薄化、宽频化和多功能化,近年来引起广泛关... 详细信息

电磁屏蔽是抑制电磁干扰并实现电磁兼容的重要技术手段.金属材料是目前应用最广泛的电磁屏蔽材料,随着5G通信、物联网、智能消费电子等领域的快速发展,金属材料在电磁屏蔽材料领域的应用趋于轻薄化、宽频化和多功能化,近年来引起广泛关注.本文从金属型和金属氧化物型电磁屏蔽材料的制备、性能及应用等方面,综述了近3年有关金属材料在电磁屏蔽领域的国内外研究进展,重点对材料的成分、电磁屏蔽效能、材料的厚度、适用频率之间的关联性进行分析和介绍,并展望其未来的发展趋势.

关键词：电磁屏蔽金属材料屏蔽机制屏蔽效能