電鍍成長磁性奈米線於陽極氧化鋁模板之製程

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研究生：	吳維晨 Wei-Chen Wu
論文名稱：	電鍍成長磁性奈米線於陽極氧化鋁模板之製程 Fabrications of Magnetic Nanowires Electrodeposited in AAO Templates
指導教授：	賴志煌 Chih-Huang Lai
口試委員:
學位類別：	碩士 Master
系所名稱：	工學院 - 材料科學工程學系 Materials Science and Engineering
論文出版年：	2008
畢業學年度：	96
語文別：	英文
論文頁數：	78
中文關鍵詞：	陽極氧化鋁、電鍍、奈米線
外文關鍵詞：	AAO, electrodeposition, nanowire
相關次數：	點閱：4 下載：0
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Nanostructure applications have attracted a lot of attention in recent years. One-dimension magnetic nanowire has unique shape anisotropy and large surface area characteristics. The reversal process in a magnetic nanowire structure is quite different from that of thin film.

The main focus of this thesis is to fabricate magnetic nanowires, including Ni, Fe and Fe-Pt nanowires in the AAO template, in which the pore diameter and aspect ratio can be controlled using chemical etching.

We successfully fabricated high-anisotropic magnetic nanowires in the AAO and demonstrate that magnetic nanowire reversal is strongly related to the wire structure. As a result, the AAO template plays an important rule for nanowire fabrication and the study of the magnetization reversal in nanowires. For Fe-Pt nanowire electro-deposition, the FePt alloy can be fabricated by controlling the composition potential dependence. However, the continued and full-filled FePt nanowires are the parts which need further improvement.

Abstract    I
摘要    II
CONTENTS    III
Chapter 1 Introduction    1
1.Motivation    1
2.Outline of the Thesis    3
Chapter 2 background    4
1.Principles of Anodic Aluminum Oxide (AAO)    4
1.1. Introduction    4
1.2. The AAO Formation Concepts    5
1.2.1. The Structure of AAO    5
1.2.2. The Mechanism of AAO Formation    6
1.2.3. The Basic Anodized Controlling Factors in Influencing the AAO Structure    10
1.2.4. Highly Ordered AAO    11
1.3. Characteristic and Application of AAO Template    15
2.Electro-Deposition Technique using AAO Templates    16
2.1. Direct Current (DC) Electro-Deposition    16
2.2. Alternating Current (AC) Electro-Deposition    18
2.3. Pulsed Electro-Deposition    18
3.Characteristics of Magnetic Nanowires    20
3.1. Shape Anisotropy    21
3.2. Magneto-crystalline Anisotropy    22
3.3. Localized and Delocalized Reversal Modes.    26
4.FePt Nanowires Electro-Deposited via AAO Template    29
4.1. Properties of FePt    29
4.2. Principal of Electrodeposited FePt Nanowires    31
4.2.1. Deposition Potential or Current Density    31
4.2.2. pH value    34
4.3. Crystal Structures of electro-deposited Fe-Pt Nanowires    35
4.3.1. As-eletrodeposited Fe-Pt Nanowires    35
4.3.2. Annealing Effect on Fe-Pt Nanowires Crystal Structures    36
4.3.3. Magnetic Anisotropy in Electro-deposited Fe-Pt Nanowire Crystal Structures    38
Chapter 3 Experiment    40
1.Experiment Flowchart    40
2.AAO preparation    41
3.Anodization and Electrochemical Instruments    44
4.Chemical Lists    46
5.Analysis Technique    47
I.Vibrating Sample Magnetometer (VSM)    47
II.X-Ray Diffraction (XRD)    49
III.    Field-emission Scanning electron microscope(FE-SEM) equipped with an energy dispersive X-ray spectrometer(EDX)    50
Chapter 4 Results and Discussion    51
1.Aluminum Foil Anodized Texture    51
2.Electrodeposited Ni nanowire    59
3.Electrodeposited Fe nanowire    65
4.Electrodeposited Fe-Pt alloy nanowire    70
Chapter 5 Conclusion    74
References    75

                                

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