Thickness and Strain dependence of Magnetic Properties of Ultrathin Fe/Ni Films on Cu(001) Substrate
- Alternative Title
- Fe/Ni 초박막에서의 두께 변화와 변형에 따른 자기적 특성 연구
- Abstract
- Using the full potential linearized augmented plane wave (FLAPW) method, the magnetic properties of ultrathin Fe/Ni films grown on Cu(001) surface have been investigated We have varied both Ni and Fe film thickness and also have explored the strain effect on the magnetic anisotropy. For surface Fe atom, a typical surface enhancement of spin magnetic moment has been observed while the magnetic moments of other constituents are rather insensitive to the strain effect. Nonetheless, we have realized that the direction of magnetization is significantly affected by the strain factor. For instance, the Fe/Ni films always have perpendicular magnetization provided that they grown on Cu (001) lattice constant. However, we have obtained a spin reorientation transition (SRT) phenomenon in the presence of strain effect. In addition, the theoretically calculated X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) are presented. Moreover, the validity of XMCD sum rule has been explored.
- Issued Date
- 2008
- Awarded Date
- 2008. 2
- Type
- Dissertation
- Publisher
- 부경대학교 대학원
- Alternative Author(s)
- Kim, Dong yoo
- Affiliation
- 부경대학교 대학원
- Department
- 대학원 물리학과
- Advisor
- 홍지상
- Table Of Contents
- Chapter 1 Introduction = 1
Chapter 2 Basic Theory = 4
2.1 Magnetic anisotropy energy = 4
2.1.1 Introduction = 4
2.1.2 Phenomenology of Magnetic Anisotropy = 5
2.1.3 Anisotropy Arising from Dipolar Interactions = 7
2.1.4 Anisotropy Arising from Spin-Orbit Coupling = 9
2.2 X-ray magnetic circular dichroism (XMCD) = 12
Chapter 3 FLAPW Method = 14
3.1 The Density Functional Theory = 14
3.1.1 The Density Functional Theory = 14
3.1.2 Spin-polarized density functional theory = 17
3.1.3 Approximation method for exchange-correlation energy = 17
3.2 The FLAPW Method = 19
3.2.1 Introduction = 19
3.2.2 The FLAPW method and Basis-set = 20
Chapter 4. Computatinal Results = 23
4.1 Numerical Method. = 23
4.2 Numerical Results and Discussion = 24
4.2.1 Structural Feature = 24
4.2.2 Magnetic Moment = 28
4.2.3 Density of State = 30
4.2.4 Magnetic Anisotropy Energy = 34
4.2.5 XMCD and Sum Rule = 40
4.3 Conclusion = 46
Reference = 47
- Degree
- Master
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