姜恩永
长期从事磁性功能材料物理的研究。
个性化签名
- 姓名:姜恩永
- 目前身份:
- 担任导师情况:
- 学位:
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学术头衔:
博士生导师
- 职称:-
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学科领域:
材料合成与加工工艺
- 研究兴趣:长期从事磁性功能材料物理的研究。
长期从事磁性功能材料物理的研究,其主要成就:1)率先创制出新型制备薄膜和承受十个氧压的尖晶石铁氧体单晶炉两类新装置,两项成果分别获得全国科学大会奖(1978)和国家教委科技进步二等奖(1988)。两项技术已被国家磁学重点实验室和中国应用磁学研究所等十一个单位采用。形成磁性功能材料系统的研究体系;2)提出Fe-N 梯度薄膜新构想,并用对向靶溅射法制备出Ms比铁高34%的Fe16N2及抗磨损耐蚀性的Fe2N等多相化合物组成的梯度薄膜,为探索超高密度磁记录头材料开辟出新径;3)在国际上推进了Fe16N2化合物研究中两个悬而未决科学问题的解决,即发现其中有不同Ms值的两种微结构,解释了同一化合物中Ms值众说纷纭的难题、提出解决该化合物亚稳相的新思路,并制出了(Fe,Ti)16N2稳定相的三元化合物,使其有了使用价值,引起国际同行关注。在国内外发表学术论文43篇,均被SCI收录,他引47篇次,1999年获得了天津市自然科学二等奖;4)率先研究出视频磁头用锰锌铁氧体大单晶(2.5kg)和设计出独特的磁单晶生长装置,使我国成为国际上除日本外两个能制备该单晶的国家之一,该技术成果被国家选为对波兰交流项目,为祖国赢得了声誉,其中两项成果分别获得天津市科技成果一等奖和二等奖;5)在完成抗核爆X射线弹头加固项目成果后得到国防部门专家验收组“澄清了不少概念,提出新的抗X射线复合膜物理模型,设计了新的技术实施方案”的评价,发表学术论文34篇,被SCI收录17篇,他人引用15篇次,获得2002年天津市自然科学二等奖;6)发现含Bi铁磁非晶中两种结构弛豫现象等。总之,他系统地研究了与磁(光)信息存储相关的新型磁性晶体和薄膜材料,并在国际上率先研制出两种新设备已被十一个单位采用,使其材料研究体系独具特色;有六项成果分别获得了国家和省部级奖励;一项成果与波兰交流和转让;完成一个国防预研项目(科技研究报告I、II);此外还获得了天津市教学成果一等奖和香港柏宁顿教育金球奖.发表论文167篇,其中在JAP、JP等国外影响因子较大的刊物发表论文83篇,《SCI》收录85篇,被引用121篇次,其中他引83篇次;在《中国科学》等国内刊物发表论文84篇。多次被邀请赴外讲学与学术交流,98年被国际同行推选为“99年国际应用磁学会议”程序委员会委员、“第二届国际磁性材料物理讨论会”学术委员、第三、四届全国磁性薄膜和纳米磁学会议学术委员会成员等。兼任国务院学位委员会学科评议组(材料II)成员,全国博士后管理委员会专家组成员,被聘为华侨大学和西南科技大学兼职教授,日本东京工业大学客座教授等。组织创建了天津大学材料物理博士点和博士后站.培养了博士后、博士、硕士生71名(外籍5名)。被评为94年度天津市劳动模范。
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主页访问
1969
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关注数
0
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成果阅读
392
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成果数
10
姜恩永, Hui Liu, E. Y. Jiang, and H. L. Bai a), R. K. Zheng, H. L. Wei, and X. X. Zhang
APPLIED PHYSICS LETTERS VOLUME 83, NUMBER 17 27 OCTOBER 2003,-0001,():
-1年11月30日
Polycrystalline Fe3O4 films have been prepared by reactive sputtering at room temperature. Transmission electron microscopy images show that the films consist of quite uniform Fe3O4 grains well separated by grain boundaries. It was found that the tunneling of spin-polarized electrons across the antiferromagnetic coupled grain boundaries dominates the transport properties of the films. Magnetoresistance (MR) {=[ρ(H)-ρ(0)]/ρ(0)} shows linear and quadratic magnetic-field dependence in the low-field range when the field is applied parallel and perpendicular to film plane, which is similar to the behaviors observed in the epitaxial Fe3O4 films consisting of a large raction of antiferromagnetic antiphase domain boundaries. At 300K, the size of the MR reaches 27.4% under a 50-kOe magnetic field, which is a very large MR for polycrystalline Fe3O4 films.
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姜恩永, H.L. Bai, E.Y. Jiang, P. Wu, Z.D. Lou, Y.Wang, C.D. Wang
Appl. Phys. A 69, 641-647 (1999),-0001,():
-1年11月30日
The structural characterization of heat-treated CN films fabricated by dual-facing-target sputtering for soft X-ray multilayer mirrors was performed by means of X-ray diffraction (XRD), Raman spectroscopy (RS) and X-ray photoelectron spectroscopy (XPS). The XRD analyses indicate a graphization process in the CN films during thermal annealing. The Raman analyses imply that the primary bonding in the CN films is sp2. In other words, the formation of the sp3 bonding in the CN films can be suppressed effectively by doping with N atoms, and thus the thickness expansion resulting from the changes in the density of CN films during annealing can be decreased considerably. This result is also clarified by the increased conductivity measured. The XPS results give the information of the existence of the strong covalent bonding between N and C atoms, which can slow down the tendency of the structural relaxation during annealing. These results suggest that CN films suitable for soft X-ray multilayers used at high-temperature environments can be obtained by reactive dual-facing-target sputtering. With the low-angle X-ray diffraction measurements, we do observe the enhanced thermal stability of CoN=CN multilayers.
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【期刊论文】The effect of Co addition on the saturation magnetization of Fe16N2
姜恩永, E. Y. Jiang, H. Y. Wang a), Z. W. Ma b)
JOURNAL OF APPLIED PHYSICS VOLUME 85, NUMBER 8 15 APRIL 1999,-0001,():
-1年11月30日
The effects of Co addition on the structure and the saturation magnetization of Fe16N2 were investigated. Enhancement of the formation of Fe16N2 phase by Co addition was observed. Films with 5-25 at% Co contents deposited at proper conditions exhibit a high saturation magnetization up to the range of 2.5-2.7 T. The saturation magnetization of (Fe, Co) 16N2 alloys phase is expected to be 2.8-2.9 T, which is as large as that of Fe16N2. This demonstrates that proper Co addition does not induce notable changes in the high saturation magnetization of the Fe16N2.
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【期刊论文】Aging effect of Co/C soft x-ray multilayer mirrors
姜恩永, E. Y. Jiang, H. L. Bai, a) R. Y. Tian, and C. D. Wang
J. Appl. Phys. 81 (1), 1 January 1997,-0001,():
-1年11月30日
The effect of aging on Co/C multilayer x-ray mirrors is presented. One significant result is the enhancement of the reflectivity at grazing incidence with time for the Co/C multilayers with C-on-top stored in air or argon and Co-on-top stored in argon. This can be interpreted in terms of a Co-C phase-separation at Co-C interfaces due to the positive enthalpy of Co-C mixing. Results also show that oxidation of the surface of Co-on-top Co/C multilayers plays an important role in the decrease of reflectivity. The oxidation can be prevented by storing the multilayers in an oxygen-free atmosphere or by depositing amorphous carbon as the top layer. The reflectivity of tarnished multilayers can be restored by removing the oxides by wet chemical methods.
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【期刊论文】Facing targets sputtered Fe-N gradient films
姜恩永, E. Y. Jiang, D. C. Sun, a) C. Lin, M. B. Tian, a) H. L. Bai, and S. Liu Ming
J. Appl. Phys. 78 (4), 15 August 1995,-0001,():
-1年11月30日
Fe-N gradient films were prepared with a facing targets sputtering system. During deposition, the nitrogen pressure increased linearly up to a value, which is called the "ultimate pressure." Composition profiles, microstructure, magnetic properties, and corrosion resistance of the films were investigated by various methods. The experimental results indicate that the Fe-N films possess some composition and structural gradients. The Fe concentration decreases from the substrate to the film surface from 100 to 66 at. %. The phases α"-Fe16N2, γ'-Fe4N, ε-FexN(2<x≤3) and ζ-FeN are present in the gradient films at different depths. Ms under the ultimate nitrogen pressure of 0.05 Pa has a value of 1803 emu/cc which is higher than that of bulk iron, this is attributed to the presence of Fe16N2. Increasing further the ultimate nitrogen pressure, Me decreases monotonically. The corrosion resistance of the gradient film with higher nitrogen concentration near the surface is good enough t'or magnetic recording heads. ~ 1995 American Institute of Physics.
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【期刊论文】Structural and magnetic properties of Fe-N gradient thin films
姜恩永, E.Y. Jiang a, *, D.C. Sun b, H. Liu a, H.L. Bai a, X.X. Zhang a
Journal of Magnetism and Magnetic Materials 140-144(1995)719-720,-0001,():
-1年11月30日
Fe-N gradient thin films are fabricated by a facing targets sputtering (F-f S) system. Rutherford backscattering spectrometry shows that the concentration of Fe atoms or N atoms varies gradually from the substrate to the surface of the film. The Fe-N gradient films contain crystal phases of ζ-Fe2N, ε-FexN (2<x<3), γ'-Fe4N and α"-Fe16N2, and amorphous FeN as well, according to different sputtering conditions.
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【期刊论文】Perpendicular magnetic anisotropy of NdFe films
姜恩永, Jiang En-yongt†‡, Wang Zhong-jie‡, and Li Jin-e‡
J. Phys.: Condens. Matter 2(1990)6089-6092. Printed in the UK,-0001,():
-1年11月30日
The perpendicular magnetic properties of NdFe alloy thin films have been studied on samples prepared by the facing targets sputtering method at a substrate temperature of 240-270 C. All the films with Nd content over 35 at.% exhibit perpendicular magnetic anisotropy. The Curie and crystalline temperatures were about 400 K and 630 K, respectively. The x-ray diffraction patterns show that the uniaxial anisotropy of a NdFe film has a certain relation to the partial oxidation of Nd in the film. The direction of the magnetic easy axis is determined by the orientation of C-Nd203; (440)-oriented C-Nd203 contributes to the formation of a perpendicular magnetic film. It is proposed that the partial oxidation of Nd may induce some short range atomic order in NdFe films.
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【期刊论文】THE MAGNETIC AND MAGNETO-OPTIC PROPERTIES OF FACING TARGETS SPUTTERED DyNdFeCo THIN FILMS
姜恩永, En Yong JIANG, Zhong Jie WANG, Chang Qing SUN, Qi LU, Xi Xiang ZHANG, Yu Guang LIU
Journal of Magnetism and Magnetic Materials 81(1989)25-28,-0001,():
-1年11月30日
The magnetic and magneto optic (MO) properties of facing Targets Sputtered (FTS) Dyx Nds(Fe75Co25)95-x amorphous films were investigated When x is over 12 at%, the easy magnetizalion axis is perpendicular to the film plane The effets of various preparation conditions were also examined, both 470K substrate temperature and 110 V bias can enhance the nniaxial aniaotropy of the films; substrate bias causes M, to decrease and Hc to increase, substrate heating will have the opposite effects These interesting results show that DyNdFeCo this films have properties similar to both Dy TM and Nd-TM thin films Furthermore, it is shown that Ihe Nd componem has a similar conmbution to the uniaxial anisotropy as the Dy component in DyNdFeCo thin films.
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【期刊论文】Structure and magnetic properties of RF sputtered Fe-N films
姜恩永, Y F Chen, , E Y Jiang, Z Q Li, W B Mi, P Wu, and H L Bai
J. Phys. D: Appl. Phys. 37(2004)1429-1433,-0001,():
-1年11月30日
Fe-N films with 20nm thick Fe underlayers were deposited on Si(100) substrates by RF magnetron sputtering, and their structure and magnetic properties were investigated. It was found that the optimum nitrogen partial pressure for α phase formation is about 2×10−4 Torr, and the saturation magnetization measured at room temperature of the Fe-N films deposited at this pressure is as high as 2179emu cc−1, which is much higher than that of pure iron. Film thickness dependence of the saturation magnetization shows that it initially increases with the increase in film thickness and reaches a maximum of~2179emu cc−1 in the thickness range of 300-570nm, and decreases with a further increase in film thickness.
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姜恩永, En-yong Jiang, Chang-qing Sun, Jin-e Li, and Yu-guang Liu
J. Appl. Phys. 65 (4), 15 February 1989,-0001,():
-1年11月30日
The Fe nitride fiims were easily produced by facing targets sputtering (FTS). The structures and magnetic properties of the films depend on the reactive pressure (PN) and dc substrate biasing voltage (Vb)o α-Fe, α"-Fe16N2, γ-Fe4N, ε-Fe3N, and ζ-FezN as well as the amorphous FeN phase have been produced at the PN ranges of 0-8~10-3 Torr. The magnetic moment per iron atom increases with PN until PN=1.O mTorr at which the α'-Fe16N2 phase appears with the coercive force Hc=103A/m, susceptibility γ=161, and μs=2.85 μB. The relation between conductivty and temperature σ-T indicates that Fe nitride films resemble a semiconductor. The Curie temperature of these films is reduced with the increase of PN. Magnetic relaxation phenomena were observed in the vicinity of 540℃.
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