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研究生:黃仁璋
研究生(外文):Jang-Chang Huang
論文名稱:單分子層官能基對鐵磁性薄膜磁性質改變之研究
論文名稱(外文):Tuning of Magnetic Properties of Ferromagnetic Thin-film by Reversing the Functional Group of Molecular Mono-underlayer
指導教授:林敏聰林敏聰引用關係
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:物理研究所
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:英文
論文頁數:50
中文關鍵詞:單分子層官能基鐵磁性薄膜
外文關鍵詞:ferromagnetic thin-filmmolecular mono-layer
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We demonstrate the tuning of magnetic properties of ferromagnetic (FM)
thin films by reversing the functional groups of a molecular mono-underlayer.
We construct a bilayer thin film system which consists of a FM material and
an organic mono-layer by applying organic molecules to form a molecular
mono-layer on the glass substrate, then depositing the FM thin film onto
the organic molecules by sputtering. We design the experiment to use only
one kind of molecule to create two different kinds of surfaces by reversing
the functional groups of the molecular mono-layer. By simply reversing the
functional groups of the mono-layer in direct contact with the FM thin films,
two kinds of surfaces have been designed to be hydrophilic or hydrophobic.
Two FM materials are studied. One is CoFe, and the other is permalloy (Py).
In the system of CoFe thin films we found the coercivity of hydrophobic
molecular mono-layer covered with CoFe films is enhanced. On the other
hand, in the system of Py thin films we found the FM behavior disappears
at room temperature when the hydrophobic molecular mono-layer is covered
with Py films, and this phenomenon is correlated to the surface morphology.
The study in this thesis is helpful to organic spintronics and could be used
to fabricate organic spintronics, which is a frontier of spintronics.
1 Introduction and Motivation 10
2 Apparatuses and Chemicals 14
2.1 Preparation and Fabrication . . . . . . . . . . . . . . . . . . . 14
2.1.1 Preparation System of Langmuir-Blodgett Films . . . . 14
2.1.2 Sputtering System . . . . . . . . . . . . . . . . . . . . 18
2.2 Analysis of Film Properties . . . . . . . . . . . . . . . . . . . 21
2.2.1 Magnetic Properties . . . . . . . . . . . . . . . . . . . 21
2.2.2 Morphology . . . . . . . . . . . . . . . . . . . . . . . . 22
2.2.3 Surface Properties . . . . . . . . . . . . . . . . . . . . 24
2.3 Chemicals and Materials . . . . . . . . . . . . . . . . . . . . . 24
2.3.1 Ferromagnetic Materials . . . . . . . . . . . . . . . . . 24
2.3.2 Amphibious Molecules . . . . . . . . . . . . . . . . . . 24
3 Experimental Processes 24
3.1 Flow chart of experiments . . . . . . . . . . . . . . . . . . . . 24
3.2 Preparation of Organic Langmuir-Blodgett Films . . . . . . . 26
3.3 Preparation of Ferromagnetic Thin Films . . . . . . . . . . . . 27
3.4 Measurement and Analysis of Samples . . . . . . . . . . . . . 27
3.4.1 Magnetic properties . . . . . . . . . . . . . . . . . . . . 27
3.4.2 Thickness . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.4.3 Morphology . . . . . . . . . . . . . . . . . . . . . . . . 28
3.4.4 Surface Properties . . . . . . . . . . . . . . . . . . . . 28
4 Results and Discussion 28
4.1 Surface Properties of Stearic Acid . . . . . . . . . . . . . . . . 28
4.2 Ferromagnetic Properties of CoFe Thin Films System . . . . . 29
4.3 Ferromagnetic Properties of Permalloy Thin Films System . . 41
5 Summary 49
6 References 50
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