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研究生:郭建成
研究生(外文):Chien-Cheng Kuo
論文名稱:3d過渡金屬超薄膜之晶格結構、合金比例及磁性交互關聯之研究
論文名稱(外文):Interrelation between crystalline structure, alloy composition and magnetic properties in 3d transition metal ultrathin films
指導教授:林敏聰林敏聰引用關係黃暉理
指導教授(外文):Minn-Tsong LinHuei-Li Huang
學位類別:博士
校院名稱:國立臺灣大學
系所名稱:物理學研究所
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:2000
畢業學年度:88
語文別:英文
論文頁數:109
中文關鍵詞:磁性超薄膜晶格結構合金成長條件
外文關鍵詞:magnetic propertyultrathin filmcrystalline structurealloygrowth condition
相關次數:
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在磁性超薄膜中的磁性,像是磁異向能 (magnetic anisotropy),居里溫度
(Curie temperature, Tc),以及自旋重取向轉變 (spin-reorientation
transition, SRT)
等特性對薄膜的生長條件、薄膜厚度、合金成份(在合金中)
和樣品的熱處理等控制參數都很敏感。
在本實驗中,我們利用超高真空腔對這些效應做了一系列詳細和有系統的研究。
包含了中能量電子繞射 (medium-energy electron diffraction,
MEED),歐傑電子能譜 (Auger electron spectroscopy,
AES),低能量電子繞射 (low-energy electron diffraction,
LEED),以及磁光科爾效應 (magneto-optical Kerr effect,
MOKE),我們分別用這些儀器來從事薄膜成長監控、
成分分析、晶格結構,以及薄膜磁性的研究。
在這些研究中,我們發現薄膜的居禮溫度對其成長溫度 (Td) 非常地敏感。
Tc 從低溫成長薄膜的 330 K 變化到高溫成長的 170 K,並且在 Td=275
K,時有劇烈的變化。 此外,我們在對 CoxNi1-x
合金的研究中發現由合金成分改變所導致的 SRT 行為。
我們發現這個轉變的臨界厚度由純鎳的 7 ML 到 Co0.08Ni0.92 的 18 ML,在
x 大於 0.1 的合金中, 使終沒有觀察到 SRT 的現象。
在一連串有系統的分析中顯示在 CoxNi1-x 合金中 鈷的成分對此合金的 SRT
行為有很大的影響。這些磁性行為的演變可以歸因為晶格結構的變化,
以及這些合金中 3d 電子對磁異向性的影響。
鍍膜後的熱處理也可以做為改變磁性以及磁光效應的方法。在對 Co/Pt(111)
薄膜加熱到高於 575 K 後,
我們發現垂直方向上的磁光效應有很顯著的增強(約為 200% 到 300%)。
我們證實這個現象和鈷與白金形成介面(表面)
合金有關。在這樣的系統中,強烈的自旋--軌道交互作用扮演了很關鍵的角色。
The magnetic properties, such as magnetic anisotropy, Curie
temperature Tc and spin-reorientation transition (SRT) of the
magnetic films in ultrathin limit are sensitively influenced by
growth conditions, film thickness, alloy composition (in alloy
films), and postdeposition annealing. A detailed and systematic
study of these effects was made in this work by applying in-situ
techniques in the ultrahigh vacuum (UHV) chamber. They include
medium-energy electron diffraction (MEED), Auger electron
spectroscopy (AES), low-energy electron diffraction (LEED), and
magneto-optical Kerr effect (MOKE) with the Lock-in technique for
the growth monitoring, determination of chemical composition as well
as crystalline structure, and magnetic properties, respectively.
In these studies, that the Curie temperature is found to be
extremely sensitive to the deposition temperature (Td). Tc varies
form 330 K for the films grown at low temperature to 170 K for that
at high temperature and drops rapidly around Td=275 K. In addition,
the composition-driven SRT for the CoxNi1-x alloy films is also
found in our investigation. The critical thickness of the SRT is
observed from 7 ML for pure Ni film to 18 ML for Co0.08Ni0.92 and no
SRT is observed for x higher than 0.1. A systematic study shows that
the SRT is strongly altered by Co concentration in the CoxNi1-x
alloy films. The evolution of the magnetic properties may be traced
back to the variation on crystalline structure and the contribution
of the number of the $3d$ electrons to the magnetic anisotropy in
these alloy films. The postdeposition annealing process can also be
employed as the driven force to modify the magnetic and
magneto-optical properties. After annealing the Co/Pt(100) films at
the temperature higher than 575 K, a significant enhancement (about
200% to 300%) of the perpendicular magneto-optical response is
observed. It is shown to be correlated to the formation of a kind of
Co-Pt interface (surface) alloy. The strong spin-orbit interaction
of the Pt may play a crucial role in this system.
Cover
Contents
1. Introduction
2. Basic Perspectives of Magnetic Ultrathin Films
2.1 Spin-Reorientation Transition
2.2 Reduction of Curie Temperature in ultrathin films
3. Experimental Circumstances
3.1 Experimental Apparatus
3.1.1 Auger Electron Spectroscopy (AES)
3.1.2 Low Energy Electron Diffraction (LEED)
3.1.3 Medium Energy Electron Diffraction (MEED)
3.1.4 Magneto-Optical Kerr Effect (MOKE)
3.2 Description of Instrument and Operation
4. Effect of Growth Temperature on Magnetic Properties:Co/Cu(100)
4.1 Sructural Information
4.2 Magnetic Properties and Curie Temperature
4.3 Critical Exponent
5. Effect of Alloy Compositionon Magnetic Properties: CCoxNi1-x/Cu(100)
5.1 Determination of Alloy Composition
5.2 Structural Information
5.3 Composition Driven Spin-Reorientation Transition
5.4 Canted Magnetic Easy Axis
5.5 Temperature Dependence of Magnetic Properties
6. Effect of Alloy Compositiono on Magneto-Optical Response:Co/Pt(111)
6.1 Temperature Dependence of Magnetic Properties
6.2 Enhancement of Magneto-Optical Response
7. Discusison
7.1 Possible Origins of Enhanced Curie Temperature
7.2 Analysis of the Composition Driven SRT
7.3 Higher Order Contribution
7.4 Effect of the Spin-Orbit Interaction
8. Conclusions
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