Lee, Kin Hang = (La₀.₆₇Sr₀.₃₃MnO₃/La₀.₄₀Ca₀.₆₀MnO₃)多層薄膜的磁致電阻特性 / 李建恆. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2008. / Includes bibliographical references. / Abstracts in English and Chinese. / Lee, Kin Hang = (La₀.₆₇Sr₀.₃₃MnO₃/La₀.₄₀Ca₀.₆₀MnO₃) duo ceng bo mo de ci zhi dian zu te xing / Li Jianheng. / Chapter Chapter 1 --- Introduction / Chapter 1.1 --- Review of Magnetoresistance --- p.1 / Chapter 1.2 --- Giant magnetoresistance (GMR) --- p.4 / Chapter 1.3 --- Colossal magnetoresistance (CMR) and rare earth manganites --- p.6 / Chapter 1.3.1 --- Tolerance factor in perovskite structure --- p.8 / Chapter 1.3.2 --- Electronic structure and magnetic exchange mechanism --- p.10 / Chapter 1.3.3 --- Jahn-Teller (JT) distortion --- p.13 / Chapter 1.3.4 --- Magnetic and electronic phase diagram --- p.15 / Chapter 1.3.5 --- Charge ordering (CO) effect --- p.18 / Chapter 1.3.6 --- Percolation in a phase-separated state --- p.19 / Chapter 1.4 --- Phase separation at the interfaces in thin films --- p.24 / Chapter 1.5 --- Our motivation --- p.26 / Chapter 1.6 --- Review of manganite multilayer system --- p.27 / Chapter 1.7 --- Scope of this thesis --- p.34 / References --- p.35 / Chapter Chapter 2 --- Instrumentation / Chapter 2.1 --- Thin film deposition --- p.39 / Chapter 2.1.1 --- Facing target sputtering (FTS) --- p.40 / Chapter 2.1.2 --- Vacuum system --- p.43 / Chapter 2.2 --- Characterization --- p.45 / Chapter 2.2.1 --- α-step profilometer --- p.45 / Chapter 2.2.2 --- X-ray diffraction (XRD) --- p.45 / Chapter 2.2.3 --- Resistance measurement --- p.48 / Reference --- p.50 / Chapter Chapter 3 --- Epitaxial growth and characterization of single layer thin films / Chapter 3.1 --- Introduction --- p.51 / Chapter 3.2 --- Fabrication of the sputtering targets --- p.51 / Chapter 3.3 --- Epitaxial growth of single layer thin films --- p.52 / Chapter 3.3.1 --- Substrate materials --- p.52 / Chapter 3.3.2 --- Review of deposition conditions of our group with FTS system --- p.54 / Chapter 3.3.3 --- Substrate temperature --- p.57 / Chapter 3.3.4. --- Target-to-target distance and sputtering power --- p.58 / Chapter 3.3.5 --- Deposition procedures --- p.59 / Chapter 3.3 --- Characterization of single layer thin films --- p.60 / References --- p.64 / Chapter Chapter 4 --- La0.67Sr0.33MnO3/La0.40Ca0.60MnO3 multilayers / Chapter 4.1 --- Sample preparation --- p.65 / Chapter 4.2 --- As-grown multilayers --- p.69 / Chapter 4.2.1 --- Structural characterization of as-grown samples --- p.69 / Chapter 4.2.2 --- Transport properties of as-grown samples --- p.80 / Chapter 4.2.2.1 --- The effect of ts for fixed tc and the effect of tc for fixed ts --- p.83 / Chapter 4.2.2.2 --- The effect of thin La0.40Ca0.60MnO3 spacer layers --- p.92 / Chapter 4.2.2.3 --- The effect of fixed bilayer thickness --- p.94 / Chapter 4.2.2.4 --- The effect of ts for fixed volume fraction (tc / ts) --- p.97 / Chapter 4.2.2.5 --- The sample without M-I transition --- p.101 / Chapter 4.3 --- Discussion --- p.103 / References --- p.108 / Chapter Chapter 5 --- Conclusion --- p.110 / Chapter 5.1 --- Conclusion --- p.110 / Chapter 5.2 --- Future outlook --- p.112 / References --- p.114

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The sample are prepared by co-sintering the pure 3D ferromagnetic colossal magnetoresistance La0.7Sr0.3MnO3 (113) and the 2D spin-glass magnetic insulator La0.7Sr0.3MnO3¡ESrO (214) with an ordered 2D magnetic-insulator superstructure. Increase the magnetic scattering and collision probabilities of the carries on the interface of the two kinds of CMR materials. The LFMR is enhanced by the electron scattering between these two phases. (La0.7Sr1.3MnO4)x / ( La0.7Sr0.3MnO3)1-x composites with x=0.1¡B0.15¡B0.2¡B0.3¡B0.5 have been fabricated by sintering the mixture of the pure La0.7Sr0.3MnO3 (n=¡Û) and the La0.7Sr1.3MnO4(n=1) at 1400 for 24 hours. Part of the 113 phase reacted with 214 phase during the 1400¢J annealing process and formed the antiferromagnetic phase , La1-2ySr2+2yMn2O7 (327), with the unknown content, y. The £l-H curve shows the magnetic interaction between the interface grain numbers of the 113 and 327 affects the effect of the low field magnetoresistance effect.

Thesis (Ph. D.)--University of Texas at Austin, 2000. / Vita. Includes bibliographical references (leaves 193-195). Available also in a digital version from Dissertation Abstracts.

Thesis (Ph. D.)--Florida State University, 2003. / Advisor:Dr. Elbio Dagotto, Florida State University, College of Arts and Sciences, Dept. of Physics. Title and description from dissertation home page (viewed Sept. 29, 2003). Includes bibliographical references.

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Thesis (Ph.D.)--University of Nebraska-Lincoln, 2007. / Title from title screen (site viewed Feb. 22, 2008). PDF text: ix, 104 p. : ill. (some col.) ; 6 Mb. UMI publication number: AAT 3274755. Includes bibliographical references. Also available in microfilm and microfiche formats.