Title

Domain wall energy in the trapezoid shaped wire with perpendicular magnetic anisotropy system

Alternative Title

수직 자기 이방성을 갖는 사다리꼴 모양의 도선에서의 자구벽 에너지 분석

DGIST Authors

Dongryul Kim ; You Chun-Yeol ; Hong Jung-Ill

Advisor

유천열

Co-Advisor(s)

Hong Jung-Ill

Issued Date

2021

Awarded Date

2021/02

Citation

Dongryul Kim. (2021). Domain wall energy in the trapezoid shaped wire with perpendicular magnetic anisotropy system. doi: 10.22677/thesis.200000366180

Type

Thesis

Subject

Trapezoidal shape wire, spin torque majority gate, domain wall, 다리꼴 모양 도선, 자구벽

Table Of Contents

1. INTRODUCTION 1
2. THEORITICAL BACKGROUND 3
2.1. Energies of the ferromagnetic system 3
2.1.1. Magnetostatic energy 3
2.1.2. Zeeman energy 4
2.1.3. Exchange interaction energy 4
2.1.4. Zeeman energy 5
2.1.5. DW energy and thickness 5
2.2. Perpendicular magnetic anisotropy (PMA) and in-plane magnetic anisotropy (IMA) 7
2.3. DW type in PMA system 8
2.4. Field driven DW motion 9
2.5. Landau-Lifshitz and Gilbert eqation (LLG equation) with DW dynamics 10
2.6. Arc shape DW 12
2.7. Polar-Kerr microscope 13
3. DEVICE FABRICATION 16
3.1. DC magnetron sputtering 16
3.2. Photolithography 18
3.3. Ion beam milling system 19
4. RESULT & DISCUSSION 20
4.1. Film characteristic and structure 20
4.2. Heff calculation in the trapezoidal system 21
4.3. DW velocity observation in the trapezoidal system 25
4.4. Heff increase according to reduing the size of trapezoidal wire 32
5. CONCLUSION 33
References 34
요약문 36

URI

http://dgist.dcollection.net/common/orgView/200000366180
http://hdl.handle.net/20.500.11750/16725

DOI

10.22677/thesis.200000366180

Degree

Master

Department

Emerging Materials Science

Publisher

DGIST

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