Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/10152
標題: The Structures and Magnetic Properties of NiFe/Mn Bilayers
鎳鐵/錳奈米雙層薄膜之結構及磁性質之研究
作者: 許禎竹
Hsu, Chen-Chu
關鍵字: exchange bias;交換偏壓
出版社: 材料科學與工程學系所
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摘要: 
In this study, the structural and magnetic properties of NiFe/Mn bilayers prepared by dual ion-beam deposition (IBAD) were investigated. The deposition time of NiFe/Mn bilayers is 25 minutes each.
X-ray diffractometry (XRD) and transmission electron microscopy (TEM) results have shown that the top NiFe layer consisted of a F.C.C. NiFe phase (a~ 3.59 Å), whereas the bottom α-Mn layer consisted of a B.C.C α-Mn phase (a~ 8.95 Å) . The grain sizes of these polycrystalline NiFe/Mn bilayers range from 5 nm to 15 nm. The thickness of NiFe/Mn bilayers is NiFe (87.5nm) and Mn (88nm).
Vibrating sample magnetometer (VSM) results show that at room temperature (298K) NiFe/Mn bilayers exhibit exchange bias field of 4.97 Oe and coercivity of 2.06 Oe under a in-plane magnetic field (12k Oe) process . At 50K NiFe/Mn shows exchange bias field of 0.32 Oe and coercivity of 12.45 Oe under a field-cooling at applied magnetic field of 12k Oe.At low temperature under a field-cooling the Hex show lower,while the Hc increase.
Atomic force microscopy (AFM) analysis indicated that roughness of NiFe/Mn bilayers surfaces (rRMS=0.36 nm) is not change in the image of 2μm×2μm scanning range.
The magnetotransport studies have shown that these NiFe/Mn bilayers exhibit the anisotropic magnetoresistance (AMR) behavior. The parallel MR ratio is 0.39 % and the perpendicular is 0.77 % and the total MR ratio is 1.16 % at room temperature (298K) in the NiFe/Mn bilayers.

本研究是利用雙離子束濺鍍系統(IBAD)製備鎳鐵(Ni80Fe20)/錳(Mn)雙層薄膜,鍍膜時間各為25分鐘,探討其結構、磁性質、交換偏壓場(Hex)及矯頑磁力(Hc)的特性。
X光繞射儀(XRD)及穿透式電子顯微鏡(TEM)分析結果顯示:NiFe薄膜層具有面心立方(F.C.C.)結構,晶格常數a~3.59Å;Mn薄膜層為體心立方(B.C.C.)結構,晶格常數a~8.95Å。多晶結構之NiFe/Mn雙層薄膜之晶粒大小約為5~15nm,鎳鐵/錳雙層薄膜厚度約為NiFe (87.5nm)/ Mn (88nm)。
震動樣品磁力計(VSM)磁性分析顯示:以VSM外加磁場(12kOe)平行膜面(In-Plane)量測NiFe/Mn雙層薄膜,在室溫(T=298K)時之交換偏壓場(Hex~4.97 Oe)、矯頑磁力(Hc~2.06 Oe),在場冷(FC at 12k Oe)至低溫(T=50 K) 時之交換偏壓場(Hex~0.32 Oe)、矯頑磁力(Hc~12.45 Oe),經由場冷後Hex變的更低,而 Hc增加。
原子力顯微鏡(AFM)表面形貌分析顯示:鎳鐵/錳雙層薄膜之影像圖其掃描範圍為2μm×2μm,其方均根表面粗糙度為rRMS=0.36 nm,粗糙度無明顯變化。
磁電傳輸性質分析顯示:NiFe/Mn雙層薄膜具有異向性磁電阻(anisotropic magnetoresistance)性質。NiFe/Mn雙層薄膜於室溫(298K)之平行的磁阻率為0.39 %,垂直的磁阻率為0.77 %,總磁阻率為1.16 %。
URI: http://hdl.handle.net/11455/10152
其他識別: U0005-1206201220075200
Appears in Collections:材料科學與工程學系

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