Z.X. Lu

Xi'an Technological University, Ch’ang-an, Shaanxi, China

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Publications (6)7.63 Total impact

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    ABSTRACT: Flakes of Fe–Si alloy were fabricated to get a relatively high permeability. Additives of graphene, TiO2 and ZnO were mixed with the Fe–Si flakes. The magnetic properties of the Fe–Si alloy flakes were slightly affected by mixing, causing little decrease of the complex permeability. But the complex permittivity was significantly reduced due to the enhanced interfacial resistivity after mixing with graphene, TiO2 or ZnO, resulting in a better electromagnetic impedance matching. The best microwave absorption performance was achieved by mixing TiO2: for an absorber thickness of 1.5 mm, a minimum reflection loss (RL) of −14.1 dB was obtained at 7.1 GHz with a large width of 3.6 GHz in which the RL is lower than −10 dB; with the absorber thickness of 2.4 mm, the minimum RL reaches −35.3 dB at 4.2 GHz. The different effects among graphene, TiO2 and ZnO additives on the electromagnetic properties are mainly related to the morphology of the additives rather than their intrinsic characteristics.
    Journal of Magnetism and Magnetic Materials 08/2013; 339:114–118. · 2.00 Impact Factor
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    ABSTRACT: High saturation magnetization and magnetic anisotropy are helpful for getting a high frequency electromagnetic microwave absorption performance. The α-Fe possesses a high saturation magnetization. Fe-B phases exhibit a relatively higher magnetic anisotropy and higher resistivity than α-Fe simultaneously. In this work, we made nanocrystalline powders of Fe82B17Cu1, mainly consisting of α-Fe and Fe2B phases, by ball milling and post-annealing. Electromagnetic microwave characterization shows that Fe82B17Cu1 powders possess a relative high permeability and considerable permittivity. Due to a good electromagnetic impedance matching, a good electromagnetic microwave absorption property (RL < -35 dB) has been achieved at 3.6 GHz. The experimental frequency and the matching thickness are coincident with the quarter wavelength matching condition.
    Modern Physics Letters B 07/2013; 27(19). · 0.48 Impact Factor
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    ABSTRACT: Surface cladding of Magnesium ferrite (MgFe2O4) was found to be helpful for effectively decreasing the permittivity of Fe flakes. So the electromagnetic impedance matching was improved, resulting in a good microwave absorption. Careful characterizations showed that the giant decreases of permittivity were ascribed to the high resistivity of surface due to the MgFe2O4 cladding. A high frequency microwave absorption property with thin absorber thickness was obtained for the Fe flakes with 10 wt% MgFe2O4.
    Journal of Magnetism and Magnetic Materials 12/2012; 324(24):4175–4178. · 2.00 Impact Factor
  • C.Y. You, J.W. Wang, Z.X. Lu
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    ABSTRACT: The Dy layer was inserted into the structure of SiO2/Ti/Nd-Fe-B/Ti as the buffer or capping layer of the Nd-Fe-B layer. The insertions of Dy layers had no significant influence on the film texture with the easy axis mainly perpendicular to the film plane. The film without Dy layer gave the out-of-plane coercivity of 533 kA/m, maximum magnetic energy product (BH)max of 245 kJ/m3. With a Dy buffer layer, the out-of-plane coercivity and (BH)max were increased to 1074 kA/m, 291 kJ/m3 respectively. The film with Dy capping layer had a coercivity of 1035 kA/m and (BH)max of 286 kJ/m3. Microstructure observations showed that the Nd-rich phases were evolved into grain boundaries from triple junctions by a Dy buffer layer deposition, resulting in a well magnetic decoupling of Nd2Fe14B neighboring grains. Through capping a Dy layer, the environment of grain boundaries had been improved and some Dy diffused into Nd2Fe14B phases, which contributed to the enhancement of magnetic performance.
    Journal of Magnetism and Magnetic Materials 04/2012; 324(7):1370–1374. · 2.00 Impact Factor
  • C Y You, N Tian, Z X Lu, L L Ge
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    ABSTRACT: During ordering process of face centered tegragonal (fct) L1(0) phase of the FePt alloy, there exist three growth variants of axes (001) from original disordered fcc structured phase. When FePt film was directly deposited on the MgO (001) substrate, the variant perpendicular to the film plane grew, resulting in a low out-of-plane coercivity of 1.3 kOe. By using Cu underlayer, two variants lying in the film plane got same chance to grow, which caused an in-plane perpendicular alignment of the tetragonal axes of FePt L1(0) phases. The crystallographic relationship between Cu and FePt layers is Cu (100)<100>//fct FePt (100)<100>. A high in-plane coercivity of 4.6 kOe was obtained due to the high density of micro-defects (mcro-twins, anti-phase boundaries, etc.) in the film plane. This work demonstrated a way of selecting the growth variants of ordering process to adjust the magnetic properties of the ordered FePt thin films.
    Journal of Nanoscience and Nanotechnology 02/2012; 12(2):1099-104. · 1.15 Impact Factor
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    C. Y. You, J. Zhu, N. Tian, Z. X. Lu
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    ABSTRACT: The Dy capping layer was deposited at different temperatures on the Nd—Fe—B thin films to investigate the mechanism of the coercivity enhancement through the Dy surface diffusion. The highest coercivity of 2005 kA/m (25.2 kOe) was obtained at the Dy deposition temperature of 460°C, which was significantly higher than the value of 1297 kA/m (16.3 kOe) without Dy capping layer. By performing the transmission electron microscopy (TEM) analysis, it was found that some of the grain boundaries were enriched with Nd element, which could be partly ascribed to the promotion by the Dy surface diffusion. In comparison to the evolution of the spin reorientation temperature of Nd2Fe14B phase after the deposition of the Dy capping layer, it is concluded that structural modification plays a significant role in the coercivity enhancement due to the Dy surface diffusion.
    Journal of Materials Science & Technology - J MATER SCI TECHNOL. 01/2011; 27(9):826-830.