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研究生:蔡金來
研究生(外文):Chin-Lai Tsai
論文名稱:可調式傾斜磁異向性探討
論文名稱(外文):Studies on tunable tilted magnetic anisotropy
指導教授:許仁華許仁華引用關係
指導教授(外文):Jen-Hwa Hsu
口試委員:吳仲卿李景明
口試委員(外文):Jong-Ching WuChing-Ming Lee
口試日期:2014-05-29
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:2014
畢業學年度:102
語文別:中文
論文頁數:105
中文關鍵詞:磁交互耦合彈簧傾斜磁異向性界面交換耦合磁性濺鍍電子自旋元件
外文關鍵詞:exchange springtunable tilted magnetic anisotropyinterlayer couplingmagnetron sputteringspintronic devices
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我們在此研究課題使用L11-CoPt二元合金薄膜(具有垂直異向性的硬磁層)與NiFe薄膜(具有水平形狀異向性的軟磁層)形成的雙層膜結構上,探討磁交互耦合彈簧,並藉由軟磁與硬磁界面交換耦合造成傾斜的磁異向性中,改變界面交換耦合的形式可用來調整軟磁層磁化方向傾斜的程度,形成可調式傾斜角度磁化方向的薄膜系統。在實驗中所使用樣品皆使用磁性濺鍍的方法,並以玻璃為基板加上20奈米厚Pt底層作成。
為了掌握此研究課題要點,我們經由對L11-CoPt垂直硬磁層與NiFe軟磁層各自作完整製程與磁性研究,確定可以掌握其各層磁性薄膜特性後,開始進行以下三大方向來進行實驗:
(1) 改變NiFe的厚度,但不改變L11-CoPt的厚度。
(2) 改變L11-CoPt的製程溫度,但NiFe的製程溫度都控制在室溫。
(3) 在CoPt與NiFe間插入中間非磁性層(Pt或Ru)。
從以上三種方法我們證明出,1)可以調控磁矩的傾斜角度從小角度到75度的範圍;2)不同製程溫度的CoPt後與NiFe形成不同的界面交互耦合強度,造成NiFe層的磁矩顯現出不同的傾斜角度;3)透過Pt層除了可以得到急速隨Pt厚度增加變小的界面耦合強度外,NiFe磁傾斜角度很快增加成為顯現水平磁異向性;4)在Ru中可以得到界面耦合強度隨Ru厚度增加造成震盪的結果。磁交互耦合彈簧的研究證明可調式磁矩的L11-CoPt/NiFe雙層膜結構在未來可應用於三維磁感應器,或是需要傾斜式磁異向性極化層的電子自旋元件。


The exchange spring behaviors and title magnetic anisotropy were studied on L11-CoPt/NiFe bilayer systems. In this investigation L11-CoPt alloy film and Ni81Fe19 ( Permalloy ) films were exploited for the hard-layer with out-of-plane (OOP) and for the soft-layer with in-plane (IP) anisotropy, respectively. Through adjusting the interlayer exchange coupling between hard-layer and soft-layer, the tunable tilted magnetic anisotropy of the soft layer can be obtained. All the films studied herein were prepared by magnetron sputtering using glass as substrates along with a seed Pt layer of 20 nm.
Before the L11 CoPt/NiFe bilayer systems were intensively investigated, the magnetic properties of bare L11 CoPt or NiFe layer were studied first.
Afterwards three different approaches as shown below were adopted to investigate the exchange spring behaviors of L11 CoPt/NiFe bilayer systems:
Varying the thickness of NiFe layer while keeping the thickness of L11 CoPt constant.
Varying the deposition temperature of L11-CoPt layer while depositng the NiFe layer always at room temperature..
Inserting a nonmagnetic layer by using either Pt or Ru between L11 CoPt and NiFe layers.
Our results reveal that the tilted magnetization angle of NiFe layer can be varied from 0° to 75°;Secondly, different processing temperature results in different interlayer coupling strength, casuing different magnetization tilted angle of NiFe layer; Third, the interlayer coupling strength decays rapidly as the thickness of Pt spacer is increased. The magnetization of NiFe is almost lying on the film plane when the thickness of Pt reachs 4 nm. Lastly, the two layer coupling strength as well as the tilted angle of NiFe layer oscillates with the thickness of Ru layer.
The above results demonstrate that the tunable tilted exchange springs can be realized with L11-type CoPt/NiFe bilayers. Furthermore, the possibilities of future applications in three-axis magnetic sensors or advanced spintronic devices demanding inclined magnetic anisotropy polarizer are justified.


口試委員審定書 I
摘要 II
Abstract III
目錄 V
圖目錄 VII
表目錄 XII
第一章 緒論 1
1-1 研究背景 1
1-2研究動機 2
1-2-1 從水平異向性到垂直異向性的原因 2
1-2-2 傾斜式磁矩 3
1-2-3 固定式傾斜磁矩 6
1-2-4 可調式傾斜磁矩 10
1-2-5 L11-CoPt/NiFe可調式傾斜磁矩 20
1-2-6 本實驗用L11-CoPt/NiFe調控磁矩的研究方向 21
第二章 理論基礎與文獻回顧 22
2-1 基礎磁學 22
2-1-1 磁性物質簡介 22
2-1-2 磁異向性(Magnetic anisotropy) 25
2-1-3 軟磁材料 28
2-1-4 各種CoPt二元合金相介紹 30
2-1-5 RKKY耦合效應 39
第三章 實驗原理與方法 43
3-1 實驗介紹 44
3-1-1 實驗裝置 44
3-1-2 濺鍍原理 45
3-1-3 磁控濺鍍原理 46
3-2 實驗製程與流程 47
3-2-1 基板的清潔 47
3-2-2 薄膜製程與參數校正 47
3-3 分析儀器介紹 50
3-3-1 原子力顯微鏡 (AFM) 50
3-3-2 掃描式電子顯微鏡(SEM) 52
3-3-3 X光繞射分析儀(XRD) 54
3-3-4 磁光柯爾效應儀(MOKE) 56
3-3-5 振動樣品磁力計(VSM) 58
3-3-6 超導量子干涉儀(SQUID) 60
3-3-7 磁力顯微鏡(MFM) 62
第四章 結果與討論 63
4-1自發性單軸磁異向性的Ni-Fe薄膜 64
4-1-1 Ni-Fe薄膜樣品製程與結構 64
4-1-2外加偏壓場有無對Ni-Fe薄膜的影響討論 65
4-1-3底層Ta和外加偏壓場對Ni-Fe薄膜的影響討論 67
4-2 L11-CoPt/NiFe Exchange Spring中改變軟磁層NiFe厚度 71
4-2-1 改變軟磁層NiFe厚度的製程與結構 71
4-2-2 改變軟磁層NiFe厚度的實驗結果 71
4-2-3 微磁學模擬 76
4-3 L11-CoPt/NiFe Exchange Spring中改變硬磁層CoPt製程溫度 79
4-3-1 改變硬磁層CoPt製程溫度與結構 79
4-3-2 改變硬磁層CoPt製程溫度的實驗結果 80
4-3-3 改變硬磁層CoPt製程溫度的微磁學模擬結果 84
4-4 L11-CoPt /NiFe Exchange spring插入中間非磁性金屬阻隔層 88
4-4-1 L11-CoPt /NiFe Exchange spring插入中間非磁性金屬阻隔層的製程與結構 88
4-4-2 L11-CoPt /NiFe Exchange spring插入中間非磁性金屬阻隔層的實驗結果 89
4-4-3 L11-CoPt /NiFe Exchange spring插入中間非磁性金屬阻隔層的微磁學模擬 98
第五章 結論 99
參考文獻 101


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