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SmCo_7永磁薄膜的高温磁学行为研究
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作者 彭龙 涂小强 +2 位作者 李乐中 王瑞 李元勋 《真空科学与技术学报》 EI CAS CSCD 北大核心 2014年第2期163-166,共4页
以Mo薄膜为衬底层,采用磁控溅射工艺在热单晶Si(100)基片上制备了3μm厚的SmCo7永磁薄膜,研究了薄膜在25—300℃范围内的高温磁学行为。基于趋近饱和定律,建立了薄膜磁晶各向异性常数K1的计算方法,结合薄膜的高温磁化曲线,获得... 以Mo薄膜为衬底层,采用磁控溅射工艺在热单晶Si(100)基片上制备了3μm厚的SmCo7永磁薄膜,研究了薄膜在25—300℃范围内的高温磁学行为。基于趋近饱和定律,建立了薄膜磁晶各向异性常数K1的计算方法,结合薄膜的高温磁化曲线,获得了蜀随温度的变化关系。高温磁滞回线测试结果表明,薄膜的剩磁比Mr/Ms随着温度的增加逐渐降低,说明SmCo晶粒的面内取向受到了破坏。此外,薄膜的磁性能具有适当的温度依赖关系,并且温度稳定性良好,有利于实现器件应用。 展开更多
关键词 稀土永磁 SmCo薄膜 高温 磁学行为
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多层膜中亚稳结构铁的形成及其磁学性能 被引量:1
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作者 潘峰 张自淑 +3 位作者 丁珉 刘兴涛 范毓殿 柳百新 《真空科学与技术》 EI CSCD 北大核心 1999年第6期406-410,共5页
报道了作者近年来在纳米多层膜中亚稳结构铁相形成及其磁学行为的研究结果 ,实验结果表明 ,已在七个多层膜系统中获得三种亚稳结构的铁相 ,它们分别具有面心立方、非晶和菱方结构 ,这三种亚稳相均表现出铁磁性行为 ,在Fe/Cu和Fe/Pd多层... 报道了作者近年来在纳米多层膜中亚稳结构铁相形成及其磁学行为的研究结果 ,实验结果表明 ,已在七个多层膜系统中获得三种亚稳结构的铁相 ,它们分别具有面心立方、非晶和菱方结构 ,这三种亚稳相均表现出铁磁性行为 ,在Fe/Cu和Fe/Pd多层膜中的面心立方结构铁的磁矩显著增强 ,面心立方结构铁的磁矩随其点阵参数的增大而减小。具有菱方结构的铁亦具有相当高的磁矩 (1 52 μB)。而具有非晶结构的铁相磁矩相对较低 ,一般均低于 0 4μB。 展开更多
关键词 亚稳结构铁 磁学行为 磁矩 多层膜
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Corrosion behavior of T2 copper in 3.5% sodium chloride solution treated by rotating electromagnetic field 被引量:5
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作者 张鹏 朱强 +2 位作者 苏倩 郭斌 程树康 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第5期1439-1446,共8页
Copper is susceptible to producing corrosion problems in corrosive environments, which leads to serious safety problems. Thus, investigating the corrosion behavior of copper is of great significance. The effects of ro... Copper is susceptible to producing corrosion problems in corrosive environments, which leads to serious safety problems. Thus, investigating the corrosion behavior of copper is of great significance. The effects of rotating electromagnetic field on corrosion behavior of T2 copper in 3.5% sodium chloride solution with electrochemical measurements were investigated. The results showed that rotating electromagnetic field changed properties of 3.5% sodium chloride solution by increasing the values of temperature and pH and decreasing the values of conductivity and dissolved oxygen. The rotating electromagnetic field improved the corrosion resistance of T2 copper. The corrosion products of T2 copper in treated 3.5% sodium chloride solution were composed of Cu20 and CuCl. The low corrosion rate of T2 copper was resulted from the decrease of dissolved oxygen in 3.5% sodium chloride solution treated by rotating electromagnetic field. 展开更多
关键词 corrosion behavior rotating electromagnetic field electrochemical measurement COPPER
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Electrodeposition and characterization of nanocrystalline Fe-Ni-Cr alloy coatings synthesized via pulse current method 被引量:5
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作者 Ebrahim YOUSEFI Ahmad IRANNEJAD Shahriar SHARAFI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第12期2591-2603,共13页
The nanocrystalline Fe-Ni-Cr coatings were electrodeposited by using the pulse current technique.The SEM results showed that the coatings had a mixed morphology of small nodules and fine cauliflower structures at low ... The nanocrystalline Fe-Ni-Cr coatings were electrodeposited by using the pulse current technique.The SEM results showed that the coatings had a mixed morphology of small nodules and fine cauliflower structures at low current densities.Also,the Cr content was increased at expense of Fe and Ni contents at high current densities.XRD patterns confirmed that the pulse current density had a positive effect on the grain refinement.The results of vibrating sample magnetometer(VSM)measurements demonstrated that by increasing the current density,the saturation magnetization was decreased and the coercivity was increased due to the enhancement of Cr content and the reduction of the grain size.The friction coefficient and wear rate values were decreased by increasing the pulse current density.Also,both the adhesive and abrasive wear mechanisms were observed on the worn surfaces.The abrasive grooves and the amount of wear debris were decreased by increasing the pulse current density. 展开更多
关键词 pulse electrodeposition current density nanocrystalline Fe-Ni-Cr coatings magnetic behavior tribological properties
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从M-T曲线上“奇异峰”分析掺杂3d族ZnO基稀磁半导体的磁学本质 被引量:2
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作者 彭英姿 Thomas Liew +1 位作者 叶志镇 张银珠 《科学通报》 EI CAS CSCD 北大核心 2007年第16期1864-1867,共4页
研究了用双束脉冲激光沉积法在蓝宝石衬底上制备的Zn0.95Co0.05O薄膜的结构和磁学性质.晶体结构分析表明制备的薄膜是具有ZnO沿c轴择优取向的纤锌矿点阵结构的单晶膜.当室温或低于室温时该薄膜具有磁性.Zn0.95Co0.05O薄膜的磁化强度随... 研究了用双束脉冲激光沉积法在蓝宝石衬底上制备的Zn0.95Co0.05O薄膜的结构和磁学性质.晶体结构分析表明制备的薄膜是具有ZnO沿c轴择优取向的纤锌矿点阵结构的单晶膜.当室温或低于室温时该薄膜具有磁性.Zn0.95Co0.05O薄膜的磁化强度随温度的变化曲线,在55K附近出现了一个小峰.小峰出现的温度与文献中报道的"奇异峰"出现的温度相似,虽然小峰凸起似乎并不如引文中的明显.没有实验结果表明引文中的"奇异峰"与纳米材料的量子效应有相关性.Zn0.95Co0.05O薄膜的磁学行为并不能用稀磁半导体的铁磁性解释.并对ZnO基稀磁半导体薄膜中的磁学本质进行了讨论. 展开更多
关键词 稀磁半导体 磁学本质 奇异磁学行为 ZnO基
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Study of Structural, Electrical and Magnetic Properties of Manganese Doped Cobalt Ferrite Nanoparticles with Non-stoichiometric Composition
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作者 M. Z. Ahsan F. A. Khan 《Journal of Physical Science and Application》 2017年第6期30-37,共8页
The nanoparticles of Co1+xMnxFe2-xO4 (0≤x ≤ 0.5) ferrite system are synthesized by solid-state reaction route using planetary ball milling technique to investigate structural, electrical and magnetic properties. ... The nanoparticles of Co1+xMnxFe2-xO4 (0≤x ≤ 0.5) ferrite system are synthesized by solid-state reaction route using planetary ball milling technique to investigate structural, electrical and magnetic properties. The X-ray diffraction patterns confirm the inverse spinel structure with residual oxide phases. Three distinct regions of frequency response on dielectric constant are observed Co1.2sMn0.5Fe1.75O4 as determined by the Wayne Kerr Impedance Analyzer. The first two regions of frequency response 1.13-4.5 MHz and 4.5-6.5 MHz exhibit the normal behavior but the last region 6.5-10.5 MHz indicates its anomalous behavior due to concurrent contribution of O^2-, Fe^3+, Co^2+ and Mn^3+ ions in the relaxation process for sintering effects (sintered at 700℃). This anomalous behavior is found to be pronounced and significant for the sample of composition Co1.25Mn0.25Fe1.75O4, which may be suitable to be used in the frequency band filter over wide range of frequencies. The single peak of imaginary part of dielectric constant (ε") indicates that the conduction process in this sample is due to the grain boundary resistance. The pronounced increase of capacitance (C) as observed from 100 ℃ to 125 ~C in temperature dependent measurement (30-125℃) is expected to eause from the change of polarization across the grain boundary due to redistribution of ions by the thermal agitation. The variation of resistance (R) with temperature (30-125 ℃) is found to exhibit semieonducting behavior that resulted from the p-type carriers (Co^2+/Co^3+). A significant increase of Z from 105 ℃ with the increase of temperature indicates the signature of phase transition from ferrimagnetic-to-ferromagnetic, which may be ascribed to the increase of Co content. The appearance of the single semicircular arc in the Cole-Cole plot may be attributed to the contribution of grain boundary resistance and correspond to the parallel equivalent circuit of resistor-capacitor (R-C) combination with single relaxation time. Saturation magnetization of Co1.25Mn0.25Fe1.75O4 and Co1.375Mn0.375Fe1.625O4 is found to be greater than the literature value (61.5 emu/g) of un-doped cobalt ferrite in the measurement of their initial magnetization using Lakeshore vibrating sample magnetometer. The negative real part of AC permeability of Co1.5Mn0.5Fe1.5O4 signifies the diamagnetic behavior in the frequency range 0.13-25.2 MHz and expected to cause from the formation of magnetic dipoles opposite to the applied field due to Mn^2+ in the B site. The samples are expected to be suitable for dielectric heating and high frequency applications. 展开更多
关键词 Cobalt ferrite dielectric constant CAPACITANCE resistance impedance cole-cole plot magnetization.
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