检索结果-南通市图书馆

Diluted magnetic oxides

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2013年第1期56卷 111-123页

作者： LI XiaoLi QI ShiFei JIANG FengXian quan zhiyong XU XiaoHong School of Chemistry and Materials Science Key Laboratory of Magnetic Molecules and Magnetic Information MaterialsMinistry of EducationShanxi Normal University

In this review,we review the progress of research on ZnO-and In2O3-based diluted magnetic oxides(DMOs).Firstly,we present the preparation and characterization of *** former includes the preparation methods and conditions,and the latter includes the characterization techniques for measuring ***,we introduce the magnetic and transport properties of DMOs,as well as the relationship between ***,the origin and mechanism of the ferromagnetism are ***,we introduce other related work,including computational work and pertinent heterogeneous structures,such as multilayers and magnetic tunnel ***,we provide an overview and outlook for DMOs.

关键词： diluted magnetic oxide preparation magnetism transport

Intrinsic exchange bias effect in strain-engineered single antiferromagnetic LaMnO3 films

在线全文

学校读者我要写书评

暂无评论

Science China Materials 2019年第7期62卷 1046-1052页

作者： Guowei Zhou Huihui Ji Yuhao Bai zhiyong quan Xiaohong Xu School of Chemistry and Materials Science Key Laboratory of Magnetic Molecules and Magnetic Information Materials Ministry of Education Shanxi Normal University Linfen 041004 China Research Institute of Materials Science of Shanxi Normal University & Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Techonology Linfen 041004 China School of Physics and Electronic Information Shanxi Normal University Linfen 041004 China

In this work, epitaxial growth of LaMnO3 thin films on different substrates using pulsed laser deposition under tensile and compressive strain was studied. The intrinsic exchange bias effect was observed in the single A-type antiferromagnetic LaMnO3 films no matter whether the tensile or compressive strain was supplied by the substrates. Due to the lattice mismatch between the film and different substrates, the intense strain can induce MnO6 octahedral rotation in the bottom region of the film neighboring the substrate, which leads to the distortion of MnO6 octahedron and the net magnetic behavior. However, the upper part maintains the original A-type antiferromagnetic order due to strain relaxation. The exchange bias effect in single films is attributed to the coupling between the bottom canted magnetic part and the upper antiferromagnetic region. The observation of exchange bias in single films on different substrates enables the emergence of a new class of biasing components in spintronics, which are based on strain-engineering.

关键词： magnetic insulating state exchange bias Mn06 octahedral rotation strain and interface effects magnetic properties

Epitaxial growth ofβ-Ga_(2)O_(3)thin films on Ga_(2)O_(3)and Al_(2)O_(3)substrates by using pulsed laser deposition

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Dielectrics 2019年第4期9卷 47-53页

作者： Yuxin An Liyan Dai Ying Wu Biao Wu Yanfei Zhao Tong Liu Hui Hao Zhengcheng Li Gang Niu Jinping Zhang zhiyong quan Sunan Dingy Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education School of Chemistry and Materials Science Shanxi Normal University Linfen 041004P.R.China Vacuum Interconnected Nanotech Workstation(Nano-X)Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of Sciences(CAS) Suzhou 215123P.R.China Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric Research School of Electronic and Information Xi’an Jiaotong UniversityXi’an 710049P.R.China

In this work,we have successfully grown high quality epitaxialβ-Ga_(2)O_(3)thin films onβ-Ga_(2)O_(3)(100)and Al_(2)O_(3)(0001)substrates using pulsed laser deposition(PLD).By optimizing temperature and oxygen pressure,the best conditions were found to be 650-700℃and 0.5 *** further improve the quality of hetero-epitaxialβ-Ga_(2)O_(3),the sapphire substrates were pretreated for atomic terraced surface by chemical cleaning and high temperature *** the optical transmittance measurements,the films grown at 600-750℃exhibit a clear absorption edge at deep ultraviolet region around 250-275 nm *** resolution transmission electron microscope(HRTEM)images and X-ray diffraction(XRD)patterns demonstrate thatβ-Ga_(2)O_(3)(-201)//Al_(2)O_(3)(0001)epitaxial texture dominated the epitaxial oxide films on sapphire substrate,which opens up the possibilities of high power electric devices.

关键词： Oxide semiconductor β-Ga_(2)O_(3)epitaxy optical transmission spectrum pulsed laser deposition crystal growth

Strain-induced robust magnetic anisotropy and room temperature magnetoelectric coupling effect in epitaxial SmFeO3 film

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Materials 2020年第10期63卷 2062-2070页

作者： Jun Zhang Wuhong Xue Tiancong Su Huihui Ji Zhi Yan Guowei Zhou zhiyong quan Xiaohong Xu School of Chemistry and Materials Science of Shanxi Normal University&Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education Linfen 041004China Department of Chemistry&Chemical Engineering Lvliang UniversityLvliang 033001China Research Institute of Materials Science of Shanxi Normal University&Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Techonology Linfen 041004China

Rare-earth orthoferrite SmFeO3 is an outstanding single-phase multiferroic material,holding great potential in novel low-power electronic ***,simultaneous magnetic and ferroelectric orders as well as magnetoelectric(ME)coupling effect at room temperature(RT)in this system have not been demonstrated *** this study,epitaxial SmFeO3 films were successfully prepared onto tensile-strain Nb-SrTiO3(Nb-STO)substrates by a pulsed laser deposition(PLD)*** results show that the films exhibit obvious ferromagnetic and ferroelectric orders at ***,the magnetic anisotropy gradually changes from out-of-plane(OP)to in-plane(IP)direction with increasing film thickness,which is attributed to the variations of O 2p-Fe 3d hybridization intensity and Fe 3d-orbit occupancy caused by the strain-relaxed ***,electrically driven reversible magnetic switching further proves that the SmFeO3 films exhibit the RT ME coupling effect,suggesting promising applications in new-generation electric-write magnetic-read data storage devices.

关键词： SmFeO3 film multiferroicity magnetoelectric coupling magnetic anisotropy

The Magnetoresistance of Nanostructured Co-ZnO Films with ZnO Buffer-Layers

在线全文

学校读者我要写书评

暂无评论

Materials Sciences and Applications 2014年第14期5卷 996-1003页

作者： Xiaoli Li Long Cheng Long Cheng Yalei Wang Yan Gao zhiyong quan Xiufang Qin Harry J. Blythe Gillian A. Gehring Xiaohong Xu Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education School of Chemistry and Materials Science Shanxi Normal University Linfen China Department of Physics and Astronomy University of Sheffield Sheffield UK

Co-ZnO films were prepared on oxidised silicon by magnetron sputtering at room temperature both with and without a ZnO buffer-layer. The Co-ZnO films consisted of Co particles dispersed in a semiconductor matrix. The combination of a Co-ZnO layer and a ZnO buffer-layer has a higher magnetoresistance than the Co-ZnO layer alone on an insulating Si substrate. The causes of this effect were investigated using X-ray photoelectron spectroscopy, depth profiling using Auger electron spectroscopy and electrical resistance as well as measurements of the change in the saturation magnetisation, the field cooled- and zero field cooled-magnetisation. This work has shown clearly what criteria are needed to optimise the magnetoresistance and how these conditions may be met by adding a buffer-layer thus making granular films based on ZnO more suitable for applications as field sensors.

关键词： Magnetron Sputtering Magnetoresistance ZnO Buffer-Layer

非线性反铁磁Mn_(3)Sn多晶薄膜的反常霍尔效应研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

稀有金属 2021年第6期45卷 680-686页

作者：全志勇陈翰韬张伟刘慧慧许小红山西师范大学化学与材料科学学院山西临汾041004 山西师范大学材料科学研究院山西临汾041004 磁性分子与磁信息材料教育部重点实验室山西临汾041004 山西先进永磁材料与技术协同创新中心山西临汾041004

非线性反铁磁材料表现出反常霍尔效应(AHE)、反常能斯特效应(ANE)等众多优异的物理性能,成为下一代室温自旋电子器件的重要候选材料,其中,具有420 K反铁磁转变温度的Mn_(3)Sn是最具代表性的材料之一。利用磁控溅射制备了非线性反铁磁Mn_... 详细信息

非线性反铁磁材料表现出反常霍尔效应(AHE)、反常能斯特效应(ANE)等众多优异的物理性能,成为下一代室温自旋电子器件的重要候选材料,其中,具有420 K反铁磁转变温度的Mn_(3)Sn是最具代表性的材料之一。利用磁控溅射制备了非线性反铁磁Mn_(3)Sn多晶薄膜,薄膜表现出显著AHE,通过改变磁控溅射气压有效调控其矫顽场,室温最大值达到3.03×10^(5)A∙m^(-1),260 K时增加到5.73×10^(5)A∙m^(-1)。X射线粉末衍射和变温霍尔测试表明多晶Mn_(3)Sn薄膜中含有少量铁磁性Mn2Sn杂相,并导致AHE在大约250 K时反常霍尔系数由负号转变为正号;通过不同角度磁场和变温霍尔电阻测试,结合垂直各向异性铁磁薄膜霍尔电阻曲线,澄清了Mn_(3)Sn薄膜中AHE与其磁矩具有较小的关联,而主要源于动量空间非线性反铁磁自旋织构产生的非零贝利曲率。这些结果不仅为反铁磁Mn_(3)Sn中AHE的来源提供实验证据,而且为非线性反铁磁材料在未来高性能自旋电子器件中的应用打下基础。

关键词：非线性反铁磁 Mn_(3)Sn薄膜反常霍尔效应非零贝利曲率

在线全文

学校读者我要写书评

暂无评论

衰弱综合征及其中医传统功法干预的研究进展

中国医药导刊 2023年第11期25卷 1130-1134页

作者：全志勇叶文彬福建中医药大学福建福州350108 福建中医药大学附属厦门中医院福建厦门361000

衰弱综合征是指老年人所特有的生理储备不足而出现的机体抗应激反应能力减退、脆弱性增加的非特异性状态,由多系统参与、多种功能紊乱失调所导致。其病理过程主要包括慢性炎症持续作用于机体,继而出现氧化应激、内分泌系统及免疫系统功... 详细信息

衰弱综合征是指老年人所特有的生理储备不足而出现的机体抗应激反应能力减退、脆弱性增加的非特异性状态,由多系统参与、多种功能紊乱失调所导致。其病理过程主要包括慢性炎症持续作用于机体,继而出现氧化应激、内分泌系统及免疫系统功能紊乱等。随着我国老龄化进程的加快,衰弱综合征的患病率逐年增加,增加了老年人跌倒、致残率、住院率和死亡的风险。对衰弱综合征目前尚无公认的标准化干预措施,主要干预手段包括抗阻运动、营养宣教、激素类药物治疗、多学科个性化的老年综合管理及中医药干预,不同的干预方法对衰弱综合征均能够取得一定的效果,但亦有其相应的局限性。本研究对衰弱综合征的流行病学、发病机制、常见干预手段和中医传统功法干预几个方面的研究进展作一综述,并在此基础上阐述中医药干预治疗衰弱综合征的优势和所面临的问题,以期为临床治疗提供借鉴。

关键词：衰弱综合征老年人中医传统功法

基于PET/CT图像的动物尾静脉渗漏校正方法

在线全文

学校读者我要写书评

暂无评论

中华核医学与分子影像杂志 2023年第5期43卷 295-298页

作者：闫宇昊杨治平全志永高玉花康飞汪静空军军医大学第一附属医院核医学科西安710032

目的建立一种将PET图像活度转换为实际活度的尾静脉渗漏校正方法, 以提高SUV计算的准确性。方法使用Nano PET/CT进行模体显像, 采用有序子集最大期望值迭代法对图像进行三维重建, 使用仪器自带软件分析PET图像, 确定最佳扫描时间和ROI... 详细信息

目的建立一种将PET图像活度转换为实际活度的尾静脉渗漏校正方法, 以提高SUV计算的准确性。方法使用Nano PET/CT进行模体显像, 采用有序子集最大期望值迭代法对图像进行三维重建, 使用仪器自带软件分析PET图像, 确定最佳扫描时间和ROI自动勾画阈值。通过对比模拟公式计算的模拟活度和直接用活度计测量鼠尾的标准活度, 在雄性昆明小鼠(n=11)上验证模拟方法的准确性, 并探究尾静脉渗漏对SUV的影响。采用两独立样本t检验分析数据。结果最佳扫描时间为10 min, 以SUVmax 42%为阈值进行ROI自动勾画。校正公式为:当0.3 MBq/ml≤渗漏浓度<6.5 MBq/ml时, 实际活度(MBq)=图像活度(MBq)/(4.48×V+77.05)×100;当6.5 MBq/ml≤渗漏浓度<14.8 MBq/ml时, 实际活度(MBq)=图像活度(MBq)/(6.65×V+71.10)×100。模拟方法与活度计测量的差异率为(6.10±2.43)%。在实际操作验证中, SUV被低估了(6.07±2.67)%, 校正后SUV(0.276±0.078)与标准SUV(0.277±0.078)差异无统计学意义(t=0.99, P=0.353), 而未校正的SUV(0.264±0.078)显著低于标准SUV(t=7.02, P<0.001)。结论基于PET图像的校正计算方法可实现尾静脉渗漏活度和动物显像SUV结果的准确校正。

关键词：诊断和治疗物质外渗正电子发射断层显像术体层摄影术 X线计算机小鼠

在线全文

学校读者我要写书评

暂无评论

实性动脉瘤样骨囊肿的影像学表现

中国医学影像学杂志 2023年第4期31卷 395-399页

作者：韩志巍文娣娣张劲松钱守斌魏梦绮全志永空军军医大学西京医院放射诊断科陕西西安710032 空军军医大学西京医院病理科陕西西安710032 空军军医大学西京医院核医学科陕西西安710032

目的探讨实性动脉瘤样骨囊肿的影像学表现,提高本病的鉴别诊断能力。资料与方法回顾性分析2007年1月—2019年1月空军军医大学西京医院经术后病理证实的5例实性动脉瘤样骨囊肿的X线、CT、MRI资料,分析病灶所在母骨位置、病灶大小形态、... 详细信息

目的探讨实性动脉瘤样骨囊肿的影像学表现,提高本病的鉴别诊断能力。资料与方法回顾性分析2007年1月—2019年1月空军军医大学西京医院经术后病理证实的5例实性动脉瘤样骨囊肿的X线、CT、MRI资料,分析病灶所在母骨位置、病灶大小形态、边缘、肿瘤基质和周围软组织改变等影像学征象。结果5例均为女性,病灶发生于胫骨2例、股骨1例、寰椎椎弓1例、髋臼周围1例,均偏心性位于母骨。病灶大小4.0~17.0 cm,均为大片状地图样、溶骨性破坏,膨胀性较轻。病灶边界清晰3例、模糊2例,有窄且长短不等的硬化缘。所有病灶骨皮质变薄、壳样改变,局部断裂、筛孔状改变或大段缺失。1例周围有软组织肿块。所有病变均无骨膜反应。2例病灶周围广泛水肿。CT表现:2例病灶内部呈等或略低于肌肉密度,无基质矿化。MRI表现:2例病灶内部T1WI信号略高于肌肉,T2WI呈均匀高信号,且有点状更高信号。所有病例均无病理性骨折。结论实性动脉瘤样骨囊肿青年女性好发。病灶呈轻度膨胀性、溶骨性改变,有窄硬化缘,CT呈均匀等低密度,MRI呈混杂信号,可突破骨皮质形成软组织肿块,邻近骨髓与软组织明显水肿。

关键词：骨囊肿,动脉瘤样体层摄影术,螺旋计算机磁共振成像