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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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【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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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】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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