Title

Role of Boron Content in CoFeB Thin Films on the Microstructure and Magnetic Exchange Interactions

DGIST Authors

Jun-Su Kim ; Chun-Yeol You ; June-Seo Kim

Advisor

유천열

Co-Advisor(s)

June-Seo Kim

Issued Date

2024

Awarded Date

2024-02-01

Citation

Jun-Su Kim. (2024). Role of Boron Content in CoFeB Thin Films on the Microstructure and Magnetic Exchange Interactions. doi: 10.22677/THESIS.200000725255

Type

Thesis

Description

CoFeB;Exchange stiffness constant (Aex);Interfacial Dzyaloshinskii-Moriya interaction (iDMI);Brillouin light scattering (BLS)

Table Of Contents

Ⅰ. Introduction 1

Ⅱ. Theorical Background 5
2.1. Energies in magnetic system 6
2.1.1. Heisenberg exchange interaction 6
2.1.2. Dzyaloshinskii-Moriya interaction 7
2.2.3. Shape anisotropy 8
2.2.4. Interfacial magnetic anisotropy 8
2.2.5. Perpendicular magnetic anisotropy 9
2.3.6. Zeeman energy 9

2.2. Brillouin light scattering (BLS) 10
2.2.1. Landau-Lifshitz-Gilbert (LLG) equation 10
2.2.2. Spin wave 12
2.2.3. Equations for spin wave modes in the magnetic thin films 14
2.2.4. Inelastic scattered light 16
2.2.5. Brillouin light scattering 17

Ⅲ. Experimental Techniques 18
3.1. Thin Film deposition 19
3.2. Brillouin light scattering spectroscopy (BLS) 21
3.2.1. Single Fabry-Pérot interferometer (FPI) 21
3.3.2. Tandem Fabry-Pérot interferometer (FPI) 24

Ⅳ. Research Theme 1 26
4.1. Overview 27
4.2. Materials and Methods 27
4.3. Results and discussion 31
4.4. Conclusion 42
4.5. Appendix 43

Ⅴ. Research Theme 2 53
5.1. Overview 54
5.2. Materials and Methods 56
5.3. Results and discussion 57
5.4. Conclusion 58
5.5. Appendix 73

Ⅶ. Reference 86

URI

http://hdl.handle.net/20.500.11750/48018
http://dgist.dcollection.net/common/orgView/200000725255

DOI

10.22677/THESIS.200000725255

Degree

Doctor

Department

Department of Physics and Chemistry

Publisher

DGIST

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