超晶格失配文献摘要.docx

phys. stat. sol. (c) 4, No. 11, 4181 – 4187 (2007) / DOI 10.1002/pssc.200675906 © 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Detailed magnetic and structural properties of exchange-biased La1-x CaxMnO3
有交换偏向的La1-x CaxMnO3详细磁性和结构性质

M. E. Gómez*, 1, G. Campillo1, J.-G. Ramirez1, A. Hoffmann2, and J. Guimpel3
1 Departamento de Física, Universidad del Valle, A. A. 25360 Cali, Colombia 2 Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA 3 Centro Atómico de Bariloche, Instituto Balseiro, 8400 S. C. de Bariloche, Argentina
Received 16 October 2006, revised 27 March 2007, accepted 30 May 2007 Published online 26 October 2007
PACS 61.10.Nz, 73.21.Cd, 75.30.Et, 75.30.Gw, 75.47.Lx, 75.70.Cn
© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
我们测量了La1-x CaxMnO3由磁性层（FM）（x=0.33）和反铁磁性层（AF）(x=0.67)构成的异性结构的磁性和磁输送性。我们在SrTiO3基体上沿(001)的取向方向上通过高压喷浅技术生成FM/AF超晶格。我们对称地改变铁磁层的厚度，而反铁磁层厚度保持不变，或反之改变反铁磁层的厚度而铁磁层厚度不变，总的超晶格厚度保持不变。通过对亚锰酸盐（001）Bragg反射附近多峰值的观察，XRD证实了超晶格结构的存在。我们提取了晶格的平均晶格常数以及其对铁磁性和反铁磁性厚度的依赖关系。我们引入了场冷却（FC）和零场冷却（ZFC），磁热和磁阻测量。AF层在低于Néel温度时交换偏向效应的存在是通过在FC之后对磁滞回路的测量展现出来的。我们研究了磁性参数和铁磁性与反铁磁性层厚度之间的关系。我们发现，结构，磁化强度和磁传输性质作为F层厚度的函数是相关的。
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Magnetoresistance of coherently strained La2/3Ba1/3MnO3 /SrTiO3 superlattices
连贯约束La2/3Ba1/3MnO3 /SrTiO3超晶格的磁滞
Yafeng Lu,1 J. Klein,1 C. Ho¨ fener,1 B. Wiedenhorst,1 J. B. Philipp,1,2 F. Herbstritt,1 A. Marx,1,2 L. Alff,1,2 and R. Gross1,2,*1II. Physikalisches Institut, Universita¨ tzuKo¨ ln, Zu¨ lpicher Strasse 77, D-50937 Ko¨ ln, Germany2Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner Strasse 8, D-85748 Garching, Germany
(Received 20 July 2000)
通过激光分子束取向附生法，将一系列的SrTiO3 /La2/3Ba1/3MnO3多层薄膜焊接在(100)SrTiO3 和(100) NdGaO3基体上。通过平面内约束，改变SrTiO3和La2/3Ba1/3MnO3层的厚度，平面外晶格常数可以连续地从3.916 Å调整到3.975 Å。应变导致了La2/3Ba1/3MnO3的双轴扭曲以致严重地影响到电传输性质和磁滞。我们的测量结果表明，相应于最大电阻系数对温度曲线以及所测量的磁致电阻，在和之间有一个明确的关系。通过改变应变，我们可以导出材料性质灵敏度与双轴应力之间的关系。我们的数据为在掺杂亚锰酸盐的Jahn-Teller电子-声子耦合提供了关联的证据。我们的分析进一步表明双轴应力是一个很重要的变量，在基于掺杂亚锰酸盐的磁电子设备薄膜结构设计中是必须要考虑的。

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Stress, interfacial effects and mechanical properties of
nanoscale multilayered coatings
纳米尺度多层涂层的应力、界面效应和力学性质
G. Abadias a, * , A. Michel a , C. Tromas a , C. Jaouen a , S.N. Dub b
a Université de Poitiers, Laboratoire de Métallurgie Physique, UMR CNRS 6630, SP2MI, Téléport 2,
Bd Marie et Pierre Curie, 86962 Futuroscope-Chasseneuil, France
b Institute of Superhard Materials, National Academy of Science, 04074 Kiev, Ukraine

摘要：
在层厚度为几个纳米范围内的多层涂层已经表明展现出其原有的力学性质：这包括弹性模量的显著软化，屈服强度的大大增加以及硬度效应。这样的原有性质是与高界面密度和与该系统减小的颗粒尺寸相联系的。在本论文的第一部分，刻画了金属/金属，金属/氮化物以及氮化物/氮化物纳米尺度多层涂层的弹性和塑性性质。通常在PVD薄膜中观察到的大压缩应力随活动颗粒的增长因此做出介绍并对不同应力源存在的取向附生多层案例做了说明。论文的第二部分集中在近年来通过实验得到的三层系统Mo/Ni, TiN/Cu 和 ZrN/W的结果中，相应于不同晶休结构和晶格错配组合。两种情况将要强调：在超晶格Mo/Ni界面混合和弹性软化之间的相互依赖关系以及TiN/Cu和ZrN/W多层组合“硬”和“软”材料的力学性质。这些涂层或者是在MgO (001)基体上或者是在Al 2O 3(通过双离子束喷浅技术取向附生生长的。低角度和高角度X-射线散射实验以及传播电子显微观察用于描述微结构和晶体取向，界面结构和缺陷生长类型。弹性性质是通过Brillouin光散射确定的而硬度值是由纲米压痕测试确定的。对于所选择的样品，组合采用FIB-TEM技术以成像在压头下纳米层板的的变形。
© 2007 Elsevier B.V. All rights reserved.
关键词: 多层涂层; 应力; 界面; 弹性异常; 硬度
First-principles investigations of the magnetocrystalline anisotropy in strained fcc Co
受约束fcc Co磁晶各向异性的第一性原理研究
G. Y. Guo*
Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
and Daresbury Laboratory, Warrington, Cheshire WA4 4AD, United Kingdom
D. J. Roberts and G. A. Gehring
Department of Physics, University of Sheffield, Sheffield S3 7RH, United Kingdom
（Received 1 September 1998; revised manuscript received 28 December 1998）
第一性原理计算用来估算磁晶各向异性能以及唯象地定义约束fcc Co 的各向异性和磁弹性常数。我们考虑一个沿[110]和[001] 方向的加载单轴应变情况。结果发现单轴应变不仅诱导出大的单轴和平面磁弹性向各异性而且可以抑制立方磁晶各向异性。在立方极限条件下，所计算的磁弹性耦合常数B1和磁晶各向异性常数K1与当前实验相符。结果用于讨论在近期观察到的fcc Co(110)/Cu膜磁各向异性作为一个膜厚度的函数的有趣现象。特别地，在厚Co膜中(>50Å)单轴和平面各向异性主要是由应变诱导的。这也表明观察到的在50 Å膜厚度时各向异性常数的突然转变可能是由从各向同性平面应变到各向异性剧烈转变的组合效应所引起的，而且当膜厚度逐渐减小时各向异性增加。
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Influence of ferromagnetic thickness on structural and magnetic properties
of exchange-biased manganite superlattices
交换偏置亚锰酸盐超晶格铁磁性厚度对结构和磁性的影响
G. Campilloa and M. E. Gomez
Universidad del Valle, Department of Physics, A.A. 25360 Cali, Colombia
A. BergerHitachi Global Storage Technologies, San Jose Research Center, San Jose, California
A. HoffmannArgonne National Laboratory, Materials Science Division, Argonne, Illinois 60439
R. Escudero
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México,
Méxi