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Reduction of Coercivity of Fe-N Soft Magnetic Film by Heat Treatment 被引量:1
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作者 Dan LI, Yousong GU, Xiangrong CHANG, Fushen LI, Lijie QIAO and Zhongzhuo TIANDepartment of Materials Physics, University of Science & Technology Beijing, Beijing 100083, China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2003年第5期491-494,共4页
200 nm thick Fe-N magnetic thin films were deposited on glass substrates by RF sputtering. The as-deposited films have high saturation magnetization but their coercivity is also higher than what is needed Therefore it... 200 nm thick Fe-N magnetic thin films were deposited on glass substrates by RF sputtering. The as-deposited films have high saturation magnetization but their coercivity is also higher than what is needed Therefore it is very important to reduce coercivity. The samples were vacuum annealed at 250℃ under 12000 A/m magnetic field. When the N content was in the range of 5-7 at. pct, the thin films consisted of α' +α' after heat treatment and had excellent soft magnetic properties of 4πMs=2.4 T, HC <80 A/m. However, the thickness of a recording head was 2μm, and Hc increased as thickness increased. In order to reduce the Hc, the sputtering power was raised from 200 W to 1000 W to reduce the grain size. 2μm Fe-N thin films were vacuum annealed under the same condition, when the N content was in the range of 5.9-8.5 at. pct, the thin films kept its excellent magnetic properties of 4πMs=2.2 T, HC <80 A/m. The properties of the films meet the need of a recording head material used in the dual-element GMR/inductive heads. 展开更多
关键词 Fe-N soft magnetic film COERCIVITY
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Electrodeposition behavior of nanocrystalline CoNiFe soft magnetic thin film 被引量:5
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作者 李劲风 张昭 +3 位作者 阴军英 俞耿华 蔡超 张鉴清 《中国有色金属学会会刊:英文版》 EI CSCD 2006年第3期659-665,共7页
The electroplating behavior of nanocrystalline CoNiFe soft magnetic thin film with high saturation magnetic flux density (Bs>2.1 T) and low coercivity (Hc) was investigated using cyclic voltammetry and chronoampero... The electroplating behavior of nanocrystalline CoNiFe soft magnetic thin film with high saturation magnetic flux density (Bs>2.1 T) and low coercivity (Hc) was investigated using cyclic voltammetry and chronoamperometry methods in conjunction with the scanning electron microscopy (SEM/EDX). The results show that, under the experimental conditions, the co-deposition of CoNiFe film behaves anomalously due to the atomic radii of iron series elements following the order of rFe>rCo>rNi. In the case of lower electroplating current density, the co-deposition of CoNiFe film follows a 3-D progressive nucleation/growth mechanism, while in the case of higher electroplating current density, which follows a 3-D instantaneous nucleation/growth mechanism. Meanwhile, the change of nucleation mechanism of CoNiFe film with electroplating current density was interpreted theoretically in the light of quantum chemistry. 展开更多
关键词 CoNiFe 纳米晶薄膜 软磁材料 脉冲电镀 晶化机制
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Microwave properties and surface topography of soft magnetic films with high resistivity
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作者 马强 江建军 +3 位作者 别少伟 田斌 梁培 何华辉 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第5期2063-2067,共5页
A single layer of CoFeB and a multilayer of CoFeB MgO films are prepared by means of DC/RF magnetron sputter deposition. The excellent microwave properties and high electrical resistivity are simultaneously achieved i... A single layer of CoFeB and a multilayer of CoFeB MgO films are prepared by means of DC/RF magnetron sputter deposition. The excellent microwave properties and high electrical resistivity are simultaneously achieved in the discontinuous multilayer structure of [Co44Fe44B12(0.7nm)/MgO(0.4nm)]40 film. This film has a high permeability (μ′) (larger than 100 below 2.1 GHz), a high magnetic loss (μ″) (larger than 100 in a range from 1.5 to 3.3GHz), a resistivity of 3.3 × 10^3μΩ. cm, a saturation magnetization of 1.2 T, and an in-plane uniaxial anisotropy field of 5.5 kA/m. The microstructure and the surface topography of the film are also analysed. The relatively large surface roughness for the discontinuous film is responsible for the wide frequency band of magnetic loss. The magnetic loss and the high resistivity indicate that the discontinuous CoFeB MgO multilayer film has potential applications in microwave absorbers and electromagnetic interference (EMI) shielding materials in a GHz frequency range. 展开更多
关键词 soft magnetic films microwave properties RESISTIVITY ROUGHNESS
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Effect of seed layers on the static and dynamic magnetic properties of CoIr films with negative effective magnetocrystalline anisotropy
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作者 马天勇 张莎 +3 位作者 张晨虎 李志伟 王涛 李发伸 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第12期554-559,共6页
The c-axis oriented hcp-Co_(81)Ir_(19)magnetic films were prepared on different seed layers(Ni,Cu,Ir,Pt,Au,and No seed).We systematically investigated the impact that surface-free energy and strain energy have on the ... The c-axis oriented hcp-Co_(81)Ir_(19)magnetic films were prepared on different seed layers(Ni,Cu,Ir,Pt,Au,and No seed).We systematically investigated the impact that surface-free energy and strain energy have on the orientation and defects and/or internal stress of the grains by increasing the lattice mismatch ratio.Moreover,the initial permeability and the natural resonance frequency were discussed in great detail using a comparison between calculated values and experimental values.We found that the almost unchanged 4πM_(s) andμ_(i) are not affected,while the changed H_(c),intrinsic K_(grain),and f_(r) are strongly dependent on the seed layer and seed layer material.Moreover,the extracted damping constant is sensitive to the defects and/or internal stress and orientation of the grains.Therefore,the soft magnetic properties and microwave properties are adjusted and optimized by seed layers with different materials. 展开更多
关键词 seed layers magnetic anisotropy surface free energy soft magnetic thin films
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Excellent soft magnetic properties realized in FeCoN thin films
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作者 张璐然 吕华 +2 位作者 刘曦 白建民 魏福林 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第3期428-431,共4页
FeCoN soft magnetic thin films are prepared by using the reactive direct-current magnetron sputtering technique. It is found that the addition of N2 can reduce the coercivity of the FeCoN film, and excellent soft magn... FeCoN soft magnetic thin films are prepared by using the reactive direct-current magnetron sputtering technique. It is found that the addition of N2 can reduce the coercivity of the FeCoN film, and excellent soft magnetic properties can be obtained when the ratio of N2 flow to total gas flow is 10%. The influences of texture, grain size, and stress on the magnetic properties and the high-frequency behaviors of the films are also discussed. 展开更多
关键词 nanocrystalline soft magnetic material magnetic thin films iron alloys
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Studies on high-moment soft magnetic FeCo/Co thin films
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作者 付煜 杨正 +2 位作者 松本光功 刘小晰 森迫昭光 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第6期1351-1355,共5页
The dependences of soft magnetic properties and microstructures of the sputtered FeCo (=Fe65Co35) films on Co underlayer thickness tCo, FeCo thickness tFeCo, substrate temperature Ts and taxget-substrate spacing dT-... The dependences of soft magnetic properties and microstructures of the sputtered FeCo (=Fe65Co35) films on Co underlayer thickness tCo, FeCo thickness tFeCo, substrate temperature Ts and taxget-substrate spacing dT-s are studied. FeCo single layer generally shows a high coercivity with no obvious magnetic anisotropy. Excellent soft magnetic properties with saturation magnetization μ0Ms of 2.35 T and hard axis coercivity Hch of 0.25 kA/m in FeCo films can be achieved by introducing a Co underlayer. It is shown that sandwiching a Co underlayer causes a change in orientation and reduction in grain size from 70 nm to about 10 nm in the FeCo layer. The magnetic softness can be explained by the Hoffmann's ripple theory due to the effect of grain size. The magnetic anisotropy can be controlled by changing dT-S, and a maximum of 14.3 kA/m for anisotropic field Hk is obtained with dT-S=18.0 cm. 展开更多
关键词 FeCo film sputtering conditions high saturation magnetization soft magnetic properties
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可溶固着软质磨粒抛光薄膜制备及性能研究
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作者 赵天晨 冯凯萍 +1 位作者 周兆忠 袁巨龙 《表面技术》 EI CAS CSCD 北大核心 2024年第12期207-217,共11页
目的实现微小光学器件高效、高质量、绿色的可溶固着软质磨粒薄膜抛光,对可溶固着软质磨粒抛光薄膜的制备工艺及抛光性能进行研究。方法研究可溶树脂、不可溶树脂、磨粒和薄膜基底等原料对成膜及抛光性能的影响,探索可溶固着软质磨粒抛... 目的实现微小光学器件高效、高质量、绿色的可溶固着软质磨粒薄膜抛光,对可溶固着软质磨粒抛光薄膜的制备工艺及抛光性能进行研究。方法研究可溶树脂、不可溶树脂、磨粒和薄膜基底等原料对成膜及抛光性能的影响,探索可溶固着软质磨粒抛光薄膜制备工艺,以光纤连接器作为加工对象验证抛光薄膜的抛光特性。结果选用双峰SiO_(2)作为磨粒,采用环氧树脂(质量分数为95%)和聚丙烯酸树脂(质量分数为5%)组成的“可溶”混合树脂为结合剂,可实现磨粒层逐步溶解。在磨粒涂覆层中添加5%(质量分数)的硅橡胶可调节磨粒涂覆层成膜后的弹性模量和硬度,使薄膜兼顾抛光性能和耐用性。对PET薄膜基底进行电晕处理可增强其表面附着力。选用含1%(质量分数为)有机硅烷偶联剂的聚氨酯树脂作为PET基底和磨粒涂覆层连接剂,结合强度好,成膜后表面无裂纹。通过光纤端面抛光对比实验发现,可溶固着软质磨粒抛光薄膜的抛光性能和耐用性均优于日本NTTAT抛光片的相关性能。可溶固着软质磨粒抛光薄膜使用25次后,光纤端面仍可保持表面光滑,曲面面形完整,表面粗糙度Ra小于5 nm,回波损耗大于45 dB,连接损耗小于0.1 dB。结论抛光实验表明,可溶固着软质磨粒抛光薄膜能实现光纤端面的高效精密加工。 展开更多
关键词 可溶固结 软质磨粒 抛光薄膜 制备 光纤连接器
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软弹流状态下“脊-膜”织构化PDMS表面增摩特性的研究
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作者 肖汉 孙勇健 +2 位作者 王涛 时礼平 李蒙 《摩擦学学报(中英文)》 EI CAS CSCD 北大核心 2024年第8期1084-1091,共8页
润滑条件下,增加软质材料(如橡胶、凝胶等)表面摩擦效应是柔性电子、皮肤传感器和智能抓取等功能器件设计制造的1个重大需求.本文中采用激光加工与多次覆膜相结合工艺,在PDMS(Polydimethylsiloxane,聚二甲基硅氧烷)表面加工出不同间距... 润滑条件下,增加软质材料(如橡胶、凝胶等)表面摩擦效应是柔性电子、皮肤传感器和智能抓取等功能器件设计制造的1个重大需求.本文中采用激光加工与多次覆膜相结合工艺,在PDMS(Polydimethylsiloxane,聚二甲基硅氧烷)表面加工出不同间距的“脊-膜”织构,研究其在流体润滑状态下接触界面的摩擦学特性,并原位考察了接触界面内润滑介质的流动特征.结果表明:“脊-膜”织构在滑动界面内产生周期性弹性迟滞,引起润滑界面的能量耗散,从而显著提高了PDMS表面在软弹流状态下的滑动摩擦效应;当“脊”间距为3 mm时,织构化表面的平均摩擦力可达100.23 mN,与光滑表面相比,其摩擦效应提高了49.6倍.此外,PDMS表面摩擦效应随法向载荷的增加而增加,但在不同滑动速度下基本保持不变. 展开更多
关键词 弹流润滑 软材料 “脊-膜”织构 应变能 摩擦力
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溶液法原位大面积制备钙钛矿光电薄膜成膜的同步辐射可视化结晶过程研究
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作者 杨迎国 冯尚蕾 李丽娜 《物理学报》 SCIE EI CAS CSCD 北大核心 2024年第6期184-192,共9页
溶液法是新型光电器件制备的重要手段,然而以钙钛矿半导体材料为代表的薄膜样品制备通常需要在手套箱环境下完成,传统的实验表征大多在空气环境下进行,这显然很难反映薄膜结构与器件性能间的真实关联,因此急需对溶液成膜过程的微结构演... 溶液法是新型光电器件制备的重要手段,然而以钙钛矿半导体材料为代表的薄膜样品制备通常需要在手套箱环境下完成,传统的实验表征大多在空气环境下进行,这显然很难反映薄膜结构与器件性能间的真实关联,因此急需对溶液成膜过程的微结构演变开展原位实时研究.为了实现溶液法成膜中的结构与形貌的同步辐射掠入射广角散射实时观测,本文结合上海同步辐射光源线站布局,报道了一种基于手套箱的原位成膜观测装置,可实现标准手套箱环境(c(H_(2)O,O_(2))<1×10^(-6))下远程控制薄膜旋涂、涂布及样品后处理,并实时可视化监测微结构和形貌演变.基于该装置进行的钙钛矿薄膜狭缝涂布大面积成膜结晶过程的原位GIWAXS/GISAXS(gtrazing incidence wide and small angle X-ray scattering)可视化测试揭示了薄膜微结构转变的内在驱动力:钙钛矿薄膜沉积界面层的优化对提升钙钛矿成核速率、诱导结晶择优取向、形成晶粒有序堆叠等具有“共性作用”,同时在成膜过程中的新生中间相显著提升软晶格薄膜质量和稳定性.基于各层均采用卷对卷全溶液狭缝涂布方法制备的大面积全柔性三维钙钛矿薄膜太阳能电池转换效率提升至5.23%(单个器件面积约15 cm^(2)),为迄今报道的这一体系该尺寸的全溶液狭缝涂布柔性钙钛矿器件的最高器件效率之一.因而,基于该同步辐射原位GIWAXS/S/GISAXS装置可以获得控制薄膜生长界面特性和薄膜品质的关键工艺,指导优化制备薄膜的最佳工艺条件. 展开更多
关键词 同步辐射掠入射X射线散射 手套箱环境 钙钛矿薄膜 软晶格 微结构演化
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无菌生物护创膜在严重创伤致软组织缺损创面早期治疗中的应用效果分析
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作者 季盟烜 黄春辉 +6 位作者 徐军 范姝雯 刘晓 吴义珠 赵小瑜 钱汉根 沈国良 《中国烧伤创疡杂志》 2024年第3期205-209,共5页
目的探讨无菌生物护创膜在严重创伤致软组织缺损创面早期治疗中的临床效果。方法选取2019年1月至2020年12月苏州大学附属第一医院收治的40例严重创伤致软组织缺损患者作为研究对象,按照不同治疗方法将其分为护创膜组(20例)与纱布组(20... 目的探讨无菌生物护创膜在严重创伤致软组织缺损创面早期治疗中的临床效果。方法选取2019年1月至2020年12月苏州大学附属第一医院收治的40例严重创伤致软组织缺损患者作为研究对象,按照不同治疗方法将其分为护创膜组(20例)与纱布组(20例),护创膜组患者在对症支持治疗的基础上局部创面早期行无菌生物护创膜联合负压封闭引流治疗,纱布组患者在对症支持治疗的基础上局部创面早期行灭菌凡士林纱布联合负压封闭引流治疗,对比观察两组患者创面疼痛评分、创面基底准备时间、创面愈合时间、住院时间、创面一次性愈合比值以及术后并发症发生情况。结果护创膜组患者治疗第7天时创面视觉模拟评分法(VAS)评分明显低于纱布组(Z=-2969,P=0003),创面基底准备时间、创面愈合时间及住院时间均明显短于纱布组(Z/t=-2394、-2782、3186,P=0017、0005、0003),而创面一次性愈合比值与纱布组无明显差异(χ^(2)=0173,P=0677);护创膜组患者术后并发症发生率为150%,与纱布组患者的术后并发症发生率200%无明显差异(χ^(2)=0173,P=0677)。结论无菌生物护创膜可有效减轻严重创伤致软组织缺损创面的疼痛程度,缩短创面基底准备时间、创面愈合时间及住院时间,具有较高的临床应用价值。 展开更多
关键词 严重创伤 软组织缺损 创面 无菌生物护创膜 生物敷料
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界面黏接对软电介质薄膜临界击穿场强影响的试验研究
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作者 邵一哲 《应用力学学报》 CAS CSCD 北大核心 2024年第1期140-147,共8页
软电介质薄膜因模量低、可大变形、适应性强等特点,被广泛应用于电气和电子系统中。但由于材料的介电常数较低,通常需要在较高的电场环境下服役。在高电场环境下,软电介质薄膜易产生失稳和电击穿破坏,影响着材料的应用范围和稳定性。本... 软电介质薄膜因模量低、可大变形、适应性强等特点,被广泛应用于电气和电子系统中。但由于材料的介电常数较低,通常需要在较高的电场环境下服役。在高电场环境下,软电介质薄膜易产生失稳和电击穿破坏,影响着材料的应用范围和稳定性。本研究针对电极对软电介质薄膜有无约束两种情况对此类器件的稳定性展开了研究:首先定量描述了电极对电介质无约束时,电压加卸载过程中失稳形貌的演化规律;其次讨论了例如氯化锂水凝胶等软电极对薄膜力电失稳的抑制,并利用化学黏接的方式增强水凝胶电极对电介质薄膜的约束,提升了电介质薄膜的临界击穿场强。 展开更多
关键词 软电介质薄膜 表面失稳 界面黏接 电场击穿强度
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建筑密封胶用包装材料及其性能要求
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作者 沈玉华 吴猛 吕晓芸 《中国建筑防水》 2024年第2期17-21,共5页
基于T/CWA 205—2021《建筑密封胶用包装材料》标准,介绍了密封胶用包装材料的性能要求,指出:包装材料应印刷清晰、无重影;软膜除基本力学性能外,应重点关注其水蒸气透过量、热封部位是否有虚封等项目;塑料胶瓶应重点关注瓶身与底盖的... 基于T/CWA 205—2021《建筑密封胶用包装材料》标准,介绍了密封胶用包装材料的性能要求,指出:包装材料应印刷清晰、无重影;软膜除基本力学性能外,应重点关注其水蒸气透过量、热封部位是否有虚封等项目;塑料胶瓶应重点关注瓶身与底盖的契合性、瓶嘴韧性、耐渗油性等项目;灌装密封胶后应尽量存放在温度5~27℃、湿度不高于70%的环境中。 展开更多
关键词 密封胶 包装材料 软膜 塑料胶瓶 外观 理化性能 贮存条件
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超声萃取法萃取PVC软质薄膜中增塑剂的可行性
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作者 苏恢恢 《聚氯乙烯》 CAS 2024年第11期37-39,共3页
分析了超声萃取法和索氏萃取法萃取PVC软质薄膜中增塑剂的优缺点。通过试验验证了超声萃取法用于气相色谱分析软质PVC薄膜中增塑剂含量和组成的样品前处理过程的可行性,并给出了最佳测试条件。
关键词 PVC软质薄膜 增塑剂 超声萃取 索氏萃取 气相色谱法 萃取率
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气-液置换法测定柔软膜材孔径的研究
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作者 郑锦维 林泽凡 +2 位作者 李昊莛 李开彤 朱锐钿 《产业用纺织品》 2024年第11期42-46,共5页
通过试验探究气-液置换法测试柔软膜材孔径的主要影响因素,发现:有效测试面积、浸润液类型、测试模式,以及是否使用支撑网,都会对孔径测试结果产生一定的影响。研究结果有助于深入理解气-液置换法测试柔软膜材孔径的机理,并为相关测试... 通过试验探究气-液置换法测试柔软膜材孔径的主要影响因素,发现:有效测试面积、浸润液类型、测试模式,以及是否使用支撑网,都会对孔径测试结果产生一定的影响。研究结果有助于深入理解气-液置换法测试柔软膜材孔径的机理,并为相关测试方法的改进和应用提供指导。这对提高柔软膜材孔径测试的准确性和可靠性具有重要意义。 展开更多
关键词 气-液置换法 柔软膜材 孔径
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Excellent magnetic softness in TbFe/FeCoV multilayers 被引量:3
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作者 FENG Tangf LI Yongle CHEN Ziyu 《Rare Metals》 SCIE EI CAS CSCD 2011年第4期322-326,共5页
[Tb4oFe6o(x nm)/Fe49Co49V2(y nm)]N multilayers were prepared by multitarget magnetron sputtering using a rotary turn-table technique in a stop-and-go mode. The mulfilayers were investigated using X-ray diffraction... [Tb4oFe6o(x nm)/Fe49Co49V2(y nm)]N multilayers were prepared by multitarget magnetron sputtering using a rotary turn-table technique in a stop-and-go mode. The mulfilayers were investigated using X-ray diffraction, field emission scan electron microscopy and vibrating sample magnetometry. The result shows that the coercive field drops abruptly with increasing number of bilayers, and it remains generally stable when the number of bilayers is 10 or higher. An excellent magnetic softness with a coercivity of 1.0 mT is obtained for x = 5 and y = 5 after annealing at 250℃. A crystalline state is observed in FeCoV layers before and after annealing by X-ray diffraction. 展开更多
关键词 rnagnetostdctive devices multiplayer films magnetic softness magnetron sputtering COERCIVITY
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Thickness Dependence of Dielectric Characteristics of SrTiO<sub>3</sub>Thin Films on MgAl<sub>2</sub>O<sub>4</sub>Substrates 被引量:1
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作者 Ryuhei Kinjo Iwao Kawayama +1 位作者 Hironaru Murakami Masayoshi Tonouchi 《Advances in Materials Physics and Chemistry》 2013年第1期58-61,共4页
SrTiO3 (STO) thin films of different thicknesses were deposited on MgAl2O4 (MAO) substrates to investigate the in-plane strain effect on the soft-mode frequency of the STO films. X-ray reciprocal space mapping (X-RSM)... SrTiO3 (STO) thin films of different thicknesses were deposited on MgAl2O4 (MAO) substrates to investigate the in-plane strain effect on the soft-mode frequency of the STO films. X-ray reciprocal space mapping (X-RSM) results indicate that there was no relaxation of the in-plane lattice strain of the STO films on MAO. Shifts in the soft-mode frequencies with a decrease in the film thickness were observed using terahertz time-domain spectroscopy (THz-TDS). However, despite the larger lattice mismatch between STO and MAO than that between STO and DyScO3 (DSO), the shifts in the soft-mode frequencies of the STO films on MAO were smaller than those on DSO. The results indicate that the soft-mode frequencies of the STO films on MAO are affected by the c-axis (out-of-plane) lengths. 展开更多
关键词 STRONTIUM TITANATE Ferroelectric soft Mode Thin film Strain Effect
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Thermal Diffusion of Si Atoms at the Interface of Mo/Si Bilayers Studied with a Soft X-ray Emission Microscope 被引量:1
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作者 YoshitakaSHITANI NoboruMIYATA +1 位作者 MihiroYANAGIHARA MakotoWATANABE 《光学精密工程》 EI CAS CSCD 2001年第5期446-450,共5页
Thermal diffusion of Si atoms at the interface in Mo/Si multilayers was observed with an imaging type soft X ray emission microscope developed by us. It was possible to observe the diffusion with 0.2nm depth resolutio... Thermal diffusion of Si atoms at the interface in Mo/Si multilayers was observed with an imaging type soft X ray emission microscope developed by us. It was possible to observe the diffusion with 0.2nm depth resolution in the direction normal to the interface by comparing the emission intensity for exactly the same position. The diffusion coefficient of Si atoms in Mo at 600℃ was roughly estimated to be 6.0×10 17 cm 2/s. 展开更多
关键词 MULTILAYER films thermal diffusion soft X-ray emission MICROSCOPE
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Effect of hydrogen plasma implantation on the micro-structure and magnetic properties of hcp-Co_(80)^(57)Fe_(4)Ir_(16)thin films
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作者 Hui Wang Meng Wu +7 位作者 Haiping Zhou Bo Zhang Shixin Hu Tianyong Ma Zhiwei Li Liang Qiao Tao Wang Fashen Li 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第5期644-649,共6页
We present detailed investigations of structural and static/dynamic magnetic properties of hydrogenated hcp-Co_(80)^(57)Fe_(4)Ir_(16) soft magnetic thin films.Two different kinds of defects,i.e.,destructive and non-de... We present detailed investigations of structural and static/dynamic magnetic properties of hydrogenated hcp-Co_(80)^(57)Fe_(4)Ir_(16) soft magnetic thin films.Two different kinds of defects,i.e.,destructive and non-destructive,were demonstrated by controlling the negative bias voltage of the hydrogenation process.Our results show that the structure and magnetic properties of our sample can be tuned by the density of the induced defects.These results provide better understanding of the hydrogenation effect and thus can be used in the future for materials processing to meet the requirements of different devices. 展开更多
关键词 soft magnetic thin film hydrogen plasma implantation Mössbauer spectroscopy
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Thin-Thick Film Transitions on a Planar Solid Surface: A Density Functional Study 被引量:5
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作者 于养信 李英峰 郑远翔 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第3期247-250,共4页
A weighted density functional theory is proposed to predict the surface tension and thin-thick film transition of a Lennard-Jones fluid on a planar solid surface. The underlying density functional theory for the Lenna... A weighted density functional theory is proposed to predict the surface tension and thin-thick film transition of a Lennard-Jones fluid on a planar solid surface. The underlying density functional theory for the Lennard-Jones fluid at low temperature is based on a modified fundamental measure theory for the hard-core repulsion, a Taylor expansion around zero-bulk-density for attraction, and a correlation term evaluated by the weighted density approximation with a weight function of the Heaviside step function. The predicted surface tension and thin-thick film transition agree well with the results from the Monte Carlo simulations, better than those from alternative approaches. For the Ar/CO2 system, the prewetting line has been calculated. The predicted reduced surface critical temperature is about 0.97, and the calculated wetting temperature is below the triple-point temperature. This is in agreement with the experimental observation. 展开更多
关键词 soft matter liquids and polymers Surfaces interfaces and thin films
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Liquid Film on Unsteady Stretching Sheet with General Surface Temperature and Viscous Dissipation 被引量:3
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作者 R. C. Aziz I. Hashim 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第11期5-8,共4页
We study the effects of viscous dissipation on flow and heat transfer in a thin liquid film on an unsteady stretching sheet. A general surface temperature is taken into consideration. The velocity and temperature fiel... We study the effects of viscous dissipation on flow and heat transfer in a thin liquid film on an unsteady stretching sheet. A general surface temperature is taken into consideration. The velocity and temperature fields are solved using the homotopy analysis method. The results show that the increasing values of the Eckert number can increase temperature distribution and the heat transfer rate. 展开更多
关键词 soft matter liquids and polymers Surfaces interfaces and thin films
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