臺灣博碩士論文加值系統

奈米複合磁性材料可應用於微機電元件製作如磁感元件、磁致伸縮元件等，因而本論文研究的主要目的即為探討奈米磁性氧化物混成微米硬磁顆粒製備而成的複合磁性材料其磁特性與阻抗頻譜分析。於此材料磁性部分，由以往文獻資料探討中顯示，在複合磁性材料中，量測之磁滯迴路會呈現在外加磁場較低處狹窄而相對應於外加磁場較高之處較為寬大的『蜂腰（Wasp-waisted）』曲線。為了探討實驗中兩種不同磁性材料混合時其晶粒間可能存在的交互作用，實驗中進一步使用了簡單的磁相疊加複合模型來描述與分析。
而本研究亦利用阻抗量測儀系統化的對此複合材料之阻抗與介電頻譜做一完整的量測，並嘗試由古典電磁學理論出發，將材料視為一低損耗介電體，同時考慮可能影響材料阻抗的因素-介電弛豫現象與磁后效應；推論所得一理論模型，再與實驗量測值做進一步的適配分析與探討。由此分析所得結果，將有助於明白磁性氧化物中高頻傳輸的微觀機制，更可提供為日後材料製作之研究依據。

The magneto-electric dynamics of composite material made of soft magnetic ferrites and hard magnetic NdFeB are studied. In this work, the nano-sized ferrites were synthesized by combustion method, and then were mixed with various amount (1, 3, 5 wt.%) of micro-sized NdFeB. The M-H behavior of the ferrites/NdFeB composites has displayed specific features of wasp-waisted hysteresis loops, correlated to the superposition of magnetization of hard and soft magnetic phases.
The variation of magneto-impedance of composites has demonstrated that small amount of NdFeB additive into ferrites can significantly effect the behavior of spectra. The analysis of the impedance spectra has being done based on the classical electromagnetism, which taking into account the occurrence of dielectric relaxation and magnetic-after effect when the samples were subjected to electromagnetic field.
Mechanism of hard and soft magnetic interaction underlying for the magneto-electric dynamics is investigated. The results imply for high frequency device applications utilizing ferrites/NdFeB nano-composites.

摘要
Abstract
總目錄...............................................Ⅰ
表目錄...............................................Ⅳ
圖目錄...............................................Ⅴ

第一章 緒論
1-1 前言.............................................1
1-2 文獻回顧..........................................2
1-2-1鐵氧磁體.........................................2
1-2-2尖晶石結構.......................................2
1-2-3磁性起源.........................................5
1-2-4磁性的分類.......................................6
1-3 鐵氧磁體粉末備製..................................11
1-4 研究動機與目的....................................14

第二章 基本理論
2-1 阻抗基本簡介......................................15
2-2 電磁波在介質中的阻抗...............................16
2-3 電磁波在低損耗介電體傳播之阻抗近似...................20
2-4 電磁波在良導體傳播之阻抗近似........................21
2-5 阻抗頻率響應......................................22

第三章 實驗步驟
3-1 樣品製備.........................................30
3-2 X光繞射分析儀.....................................32
3-3震盪樣品磁性量測儀VSM...............................36
3-4 HP4284A 高頻阻抗分析儀............................38

第四章 實驗結果與討論
4-1 Ni0.36Zn0.64Fe2O4磁性氧化物之磁特性................41
4-1-1不同熱處理溫度下之Ni0.36Zn0.64Fe2O4晶格結構........41
4-1-2不同熱處理溫度對Ni0.36Zn0.64Fe2O4磁性的影響........44
4-1-3 Ni0.36Zn0.64Fe2O4與Nd2Fe14B晶粒間之交互作用......49
4-2 阻抗頻譜分析......................................58
4-2-1 Ni0.36Zn0.64Fe2O4不同熱處理溫度之阻抗頻譜.........58
4-2-2 Ni0.36Zn0.64Fe2O4混合不同比例Nd2Fe14B之阻抗頻譜...65
4-2-3 Ni0.36Zn0.64Fe2O4混合不同比例Nd2Fe14B之介電頻譜...71
4-3 阻抗特性分析.......................................79
第五章 結論...........................................92
參考文獻..............................................95

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