磁伸縮材料能將電磁能與機械能互相轉換，在微機電及感測元件的應用上極具潛力，因此引起廣泛的研究與討論。本文針對Tb0.3Dy0.7(Fe, Be)2塊材、Tb(Fe, Mn, Al)2塊材、Tb0.3Dy0.7(Fe, Mn, Al)2薄帶和Tb-Fe薄膜的磁性及磁伸縮應變加以研究。
利用電弧熔鍊的方式將不同比例的鋱、鈹、錳、鋁、鏑及鐵，熔鍊形成Tb0.3Dy0.7(Fe1-xBex)2塊材(x= 0~0.1)、Tb(Fe0.9MnxAl0.1-x)2塊材(x= 0~0.1)，結果顯示添加少量的鈹取代Tb0.3Dy0.7Fe2中的鐵，對硬度、磁伸縮係數l、動態應變係數最大值d33max和相對應的磁場Hd33max都有正面的作用，最佳條件的樣品鈹含量為6.67原子百分比，當外加磁場為0.5 kOe時，磁伸縮為原來未添加鈹的6倍；d33max從97×10-9 Oe-1提升到256×10-9 Oe-1，為原來的2.5倍；Hd33max從1.62 kOe降低為0.62 kOe。同時添加少量的錳和鋁取代TbFe2中的鐵，對硬度、小磁場中的l、d33max和Hd33max都能有所改善，最佳條件的樣品錳含量為2.67原子百分比，當外加磁場為1 kOe時，磁伸縮為TbFe2的11倍；d33max從210×10-9 Oe-1提升到360×10-9 Oe-1；Hd33max從1.75 kOe降低為0.56 kOe。

Tb0.3Dy0.7(Fe0.9Mnx Al0.1-x)2薄帶是運用單輪熔液旋淬法製作，銅輪轉速介於30到40 m/s之間。薄帶Mn-01與Mn-05的樣品有立方型Laves phase部分結晶，而樣品Mn-07與Mn-09的樣品則有富稀土相析出。由磁伸縮係數的量測結果得知，薄帶的磁伸縮應變不適合用應變規來量測。

利用直流磁控濺鍍的方式，改變不同濺鍍參數製作Tb-Fe薄膜。並藉由磁力顯微鏡，觀測不同膜厚、基板溫度及濺鍍功率的薄膜表面磁結構。此外，施加大小不一的張應力於薄膜上，並觀察表面磁結構的變化。最後再運用微磁學的理論，討論所觀測到的磁區結構，並計算出樣品的單位面積磁壁能及交換常數。

The magnetostrictive materials are potential for MEMS and device applications, because of their capability to convert magnetic energy to mechanical energy. This thesis reports the magnetostriction and magnetic properties of Tb0.3Dy0.7(Fe,Be)2 bulks, Tb(Fe,Mn,Al)2 bulks, Tb0.3Dy0.7(Fe,Mn,Al)2 ribbons and Tb-Fe thin films.
Ingots of Tb0.3Dy0.7(Fe1-xBex)2 (x= 0~0.1) and Tb(Fe0.9MnxAl0.1-x)2 (x= 0~0.1) alloys were prepared from 99.9% purity Tb, Dy, Fe, Be, Mn and Al by acr-melting in a cold copper crucible under an argon atmosphere. The results indicate that the addition of beryllium improves hardness, magnetostriction l, dynamic strain coefficient d33max and lowers the corresponding field Hd33max for Tb0.3Dy0.7(Fe1-xBex)2 alloys. The optimum specimen of Be-series is that 6.67 at.% Be, and the magnetostriction is five times larger then unmodified under a magnetic field 0.5 kOe. The d33max value of the optimum specimen (256×10-9 Oe-1) is 1.5 times larger then that of original specimen (97×10-9 Oe-1), and Hd33max is improved from 1.62 kOe to 0.62 kOe.

The modification by both Mn and Al improves hardness, l at low field, d33max and lowers Hd33max for Tb(Fe0.9MnxAl0.1-x)2 alloys. The x=0.04 (2.67 at.% Mn) alloy is the optimum one in Mn-Al-series, and the magnetostriction is ten times larger then that unmodified under a magnetic field 1 kOe. The d33max value of the optimum specimen increases from 210×10-9 Oe-1 to 360×10-9 Oe-1, and Hd33max is improved from 1.75 kOe to 0.56 kOe.

Tb0.3Dy0.7(Fe0.9MnxAl0.1-x)2 ribbons were prepared by melt-spinning method. All of the specimens contain partial crystalline of Laves phase or rare earth rich phase, even the wheel speed achieved 40 m/s. The results indicate that strain gauge method is not suitable for measuring magnetostriction of ribbons.

Tb-Fe thin films were prepared by DC magnetron sputtering from an alloy-target with different sputtering parameters, which included substrate temperature, sputtering time and power. The magnetic force microscopy was used to observe the domain structure of the samples. The domain structure versus strain effect was studied. From the domain observe, we calculated the domain wall energy per unit area and exchange const.

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