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研究生: 林建良
Lin, Jian-Liang
論文名稱: 脈衝雷射沉積法製備釔銩鐵石榴石薄膜的探討:結構、光學與磁性研究
Structural,Optical and Magnetic properties of Tm-doped YIG thin films grown by pulsed-laser deposition
指導教授: 駱芳鈺
Lo, Fang-Yuh
學位類別: 碩士
Master
系所名稱: 物理學系
Department of Physics
論文出版年: 2018
畢業學年度: 106
語文別: 中文
論文頁數: 47
中文關鍵詞: 釔鐵石榴石脈衝雷射鍍膜
英文關鍵詞: Yttrium iron garnet, Thulium, Pulsed-laser deposition (PLD)
DOI URL: http://doi.org/10.6345/THE.NTNU.DP.019.2018.B04
論文種類: 學術論文
相關次數: 點閱:157下載:14
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本論文以脈衝雷射蒸鍍法在c方向單晶藍寶石基板上製備100nm厚的TmxY3-xFe5O12薄膜,並探討薄膜鍍膜速率、薄膜的結構特性、光學性質及磁性的關係,其中單位面積雷射能量為3.5 J/cm2,鍍膜氧壓分別為3×10-1 mbar,Tm取代比例為x=0~3,基板溫度為750℃。
TmxY3-xFe5O12薄膜鍍膜速率不隨著取代比例增加而加快,鍍膜速率並無特定趨勢。X光繞射及拉曼散射光譜顯示隨著取代比例增加,薄膜由多晶轉為非晶結構,代表基板與薄膜的晶格失配度過大而無法形成單晶結構,薄膜在x=1.5時結晶品質最好。X光電子能譜分析,取得薄膜的銩與釔的實驗比例與理論值不符。利用原子力顯微鏡來看表面形貌與粗糙度,表面有許多柱狀晶體與粗糙度大約為20nm粗糙表面。超導量子干涉磁量儀測定與柯爾磁光顯微鏡結果顯示所有薄膜都沒有表現出磁性。

In this paper, a 100nm thick TmxY3-xFe5O12 film was prepared on a c-oriented single crystal sapphire substrate by pulsed-laser deposition. The relationship between the film coating rate, the structural properties, optical properties and magnetic properties of the film was investigated. The laser energy fluence is 3.5 J/cm2, the coating oxygen pressure was 3×10-1 mbar, the Tm substitution ratio was x=0~3, and the substrate temperature was 750 °C.
The coating rate of TmxY3-xFe5O12 film does not increase with the increase of the substitution ratio, and there is no specific trend of coating rate. X-ray diffraction and Raman scattering spectroscopy show that the structure of thin films changes from polycrystalline to amorphous as Tm concerntration increases,and the film has the best crystal quality at x=1.5. According to the x-ray photoelectron spectroscopy, the experimental ratio of thulium to yttrium of the film is not in agreement with the theoretical value. The surface topography and roughness were observed by atomic force microscopy with a number of columnar crystals and a rough surface of approximately 20 nm roughness. The results of SQIUID and Kerr Magneto-Optical Microscopy showed that all films showed no magnetic properties.

致謝 i 摘要 ii Abstract iii CH1 序論 1 CH2 背景知識 3 2.1 釔鐵石榴石(Y3Fe5O12)、銩(Tm)與藍寶石基板(Sapphire)的性質 3 2.2 脈衝雷射蒸鍍法(pulsed-laser deposition,PLD) 6 2.3 退火 8 2.4 X光繞射(X-ray diffraction,XRD)與X光光電子能譜(X-ray photoelectron spectroscopy,XPS) 8 2.5 拉曼散射光譜(Raman-scattering spectroscopy) 13 2.6 原子力顯微術(atomic force microscopy,AFM) 15 2.7 表面輪廓儀(Profilo meter) 16 2.8 超導量子干涉磁量儀(SQUID magnetometer) 17 2.9 材料的磁性簡介 18 2.10 磁光科爾效應 19 CH3 實驗過程 21 3.1 鍍膜條件 21 3.2 靶材製備 21 3.3 藍寶石基板清洗 22 3.4 鍍膜流程 22 3.5 退火流程 23 CH4 結果與討論 24 4.1 鍍膜速率分析 24 4.2 XRD結果分析 25 4.3 XPS結果分析 28 4.4 Raman結果分析 30 4.5 表面形貌與粗糙度 32 4.6 SQUID結果分析 34 4.7 磁光柯爾顯微鏡結果分析 35 CH5 結論與展望 45 參考資料 46

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