磁性尖晶亞鐵礦奈米顆粒及鎳薄膜之磁壁與自旋共振研究

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研究生：	謝長村 Chang-Tsun Hsieh
論文名稱：	磁性尖晶亞鐵礦奈米顆粒及鎳薄膜之磁壁與自旋共振研究 Domain Wall and Spin Resonance Studies of Spinel Ferrite Nanoparticles and Nickel thin films
指導教授：	呂助增 Juh-Tzeng Lue
口試委員:
學位類別：	博士 Doctor
系所名稱：	理學院 - 物理學系 Department of Physics
畢業學年度：	92
語文別：	英文
論文頁數：	136
中文關鍵詞：	電子自旋共振、磁性奈米顆粒、磁壁、量子相變、巨觀量子穿隧、鎳薄膜
外文關鍵詞：	Electron Spin Resonance, Spinel Ferrite Nanoparticles, Domain walls, Quantum Phase Transition, Macroscopic quantum tunneling, nickel thin films
相關次數：	點閱：119 下載：0
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本篇論文目的是針對磁性薄膜磁區與奈米磁顆粒的物理性質做研究。主要分成兩部分來做探討：(一) 以電子自旋共振研究奈米磁顆粒之量子相變 (二) 在鎳薄膜上以磁力顯微儀觀察磁區之變化。

Abstract (Chinese)                                             i
           Abstract (English)                                             iii
            Acknowledgement
            Contents
           Chapter 1  Introduction
                1.0 Overview of magnetism                                        1
             1.1 Overview of magnetic nanoparticles                              1
             1.2 Progresses and challenges                                      3
                1.3 Overview of magnetic thin films                                 4
             1.4 Organization of dissertation                                     4
             References                                                     6
           Chapter 2 Theoretical Fundamentals of Magnetic Nanoparticles
             2.1 single domain particles and superparamagnetism                     9
           2.2 Tunneling of the magnetic moment in monodomain ferromagnetic particles 10
             2.3 Anisotropy of magnetic nanoparticles                             12
             2.4 Quantum phase transition
             2.4.1 What is a quantum phase transition?                        13
                    2.4.2 Quantum versus classical phase transitions                   14
                2.4.3 Ising model in the transverse field                          15
                2.4.4 Heisenberg model with strong easy-plane anisotropy           17
                2.4.5 Experimental family of quantum phase transitions             19
             References                                                    21
           Chapter 3 Experimental Techniques
              3.1 Magnetic force microscopy                                    26
           3.2 Fabrication of magnetic nanoparticles (ferrofluids)                 27
           3.3 Electron paramagnetic resonance                               28
           3.4 Superconducting quantum interference devices                    29
                 References                                                    30
           Chapter 4 Electron Paramagnetic Resonance to Ferromagnetic Resonance in Iron-oxide Nanoparticles
                 4.1 Introduction                                               34
                 4.2 Sample preparation                                         35
                 4.3 Electron paramagnetic resonance                              36
                 4.4 Ferromagnetic resonance                                     39
           4.5 Conclusions                                               42
           References                                                   45
           Chapter 5 Electron Spin Resonance Studies of Quantum Critical Behavior in Spinel Ferrite Nanoparticles
              5.1 Introduction                                               54
                   5.1.1 Historical review of SPR spectra in magnetic nanoparticles      56
                   5.1.2 Imperative for electron paramagnetic resonance               57
                   5.1.3 Urgent for quantum phase transitions                        58
                   5.1.4 Chapter outline                                         58
              5.2 Conventional superparamagnetic resonance to ferromagnetic resonance in spinel ferrites nanoparticles                                        59
           5.3 Quantum paramagnetic resonance of magnetite nanoparticles at low temperatures                                               60
              5.4 Particle size dependence in magnetite nanoparticles               62
              5.5 Quantum paramagnetic resonance of spinel ferrites nanoparticles    63
                 5.6 Anomalous hyperfine structures in magnetite nanoparticles         64
              5.7 Other effects----
                    5.7.1 Transverse microwave magnetic field                      65
           5.7.2 Dipolar interactions                                    66
                 5.7.3 Quantum paramagnet at ferrite-organic interface             68
              5.8 Summary                                                 69
              References                                                   70
           Chapter 6  Quantum superparamagnet in CoFe2O4 Nanoparticles
           6.1 Introduction                                               88
           6.2 Magnetization measurements                                  89
           6.3 ESR spectra of Co-ferrite nanoparticles                          91
           6.4 Particle size dependence on QSP                               93
           6.5 Discussion                                                 95
           6.6 Summary                                                  96
           References                                                    96
           Chapter 7  A High-resolution Magnetic Force Microscopic Study of Domain Walls on Thin Nickel Films
                 7.1 Introduction                                              110
            7.2 Experimental procedures                                    111
                 7.3 Theory                                                  112
                 7.4 Results and discussion                                      113
                 7.5. Conclusion                                              117
           References                                                  118
           Chapter 8 Conclusions and Open Questions
              8.1 Conclusions of present studies                               126
                 8.2 Suggestions for future work                                 127
                 References                                                 128
           Autobiographyrf
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