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研究生:古哲安
研究生(外文):Che-An Ku
論文名稱:Ni80Fe20╱Cr╱Ni80Fe20磊晶膜之磁耦合隨Cr厚度變化之研究
論文名稱(外文):Studies of magnetic coupling vibration with Cr thickness Of Ni80Fe20╱Cr╱Ni80Fe20 sandwich
指導教授:黃榮俊黃榮俊引用關係
指導教授(外文):J.C.A Huang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:物理學系碩博士班
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:2002
畢業學年度:90
語文別:中文
論文頁數:90
中文關鍵詞:鎳鐵鉻三層膜反鐵磁耦合
外文關鍵詞:NiFe/Cr/NiFe
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為了要了解NiFe/Cr/NiFe薄膜其磁性與結構的關係,本實驗室利用分子束磊晶(Molecular Beam Epitaxy,MBE)系統來成長高品質的NiFe/Cr/NiFe薄膜。而成長方式是階梯式成長法方式來成長薄膜,利用只改變不同的成長厚度,但卻又可以固定其它成長條件,如成長溫度、基板種類等,因而來探討比較不同成份比例的因素。藉由改變不同的成長因素,來找出成長良好垂直磁異向性所需的條件。
磊晶時以臨場(in situ)電子繞射 (RHEED)確認上下兩層Py ( 111 ) 和中間層Cr( 110 ) 是否有良好的結構。對於Cr( 110 )層而言,由於對稱性以及Cr( 110 )Py ( 111)兩者晶格之不匹配,造成有兩個in-plane domains, 即 KS and NW domains。以LMOKE 及 中子散射分析Py/Cr/Py三層薄膜之磁性結構。結果顯示這個Py層之間的耦合效應取決於Cr層的厚度 (tCr)。當上下兩層Py厚度為5.0nm且tCr=2.5nm時,發現反鐵磁耦合效應為最明顯。
By molecular beam epitaxy (MBE), the author has prepared high-quality Ni80Fe20 / Cr / Ni80Fe20 trilayers with different spacer (Cr) thickness on Al2O3(11-20) substrates. This thesis study on the magnetoresistance effect and the oscillation behavior of antiferromagnetic coupling as a function of the Cr thickness in Ni80Fe20 / Cr / Ni80Fe20.
The in situ RHEED studies showed that the top and bottom Py layers were grown as nice Py(111) and in-between Cr layer was grown as Cr(110). For the Cr(110) layer however, there are two in-plane domains, namely KS and NW domains, due to the symmetry and lattice mismatches between the Cr(110) and Py(111) plane. The magnetic structure of the Py/Cr/Py trilayers was studied by LMOKE and neutron scattering. The results indicate that the coupling between the Py layer depends on the thickness of the Cr layer (tCr). Clear anti-ferromagnetic coupling was observe for tCr =2.5 nm. Detailed structural, magnetic and transport properties of the epitaxial Py/Cr/Py trilayers will be reported.
目錄
第一章 簡介
1.1 前言………………………………………………………………………...1
1.2 磁性的起源………………………………………………………………...2
1.3 磁阻的簡介………………………………………………………………...4
1.4 GMR效應…………………………………………………………………..6
1.5 RKKY模型………………………………………………………………..12
1.6異向性簡介………………………………………………………………..14
1.7異向性的量測……………………………………………………………..29
1.8界面粗糙度………………………………………………………………..34
第二章 實驗步驟
2.1 系統真空環境的準備……………………………………………………..35
2.2 基板的準備………………………………………………………………..36
2.3 樣品成長…………………………………………………………………..37
2.4樣品成長方式……………………………….…………………….………..38
第三章 實驗儀器介紹
3.1分子束磊晶系統系統……………………………………………..………...40
3.2 實驗量測儀器…………………..…………………………………………..46
第四章 實驗結果與討論
4.1磊晶結構對NiFe/Cr/NiFe磁性的影響……………………………………..64
4.2成長溫度對NiFe/Cr/NiFe磁性的影響…………………………………….72
4.3成長Cr厚度對NiFe/Cr/NiFe磁性的影響…………………………………76
4.4 NiFe/Cr/NiFe之磁矩及MR分析………………………………….……….84
第五章 結論………………………………………………………………..…….92
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