Title

The asymmetric pinning potential in domain wall velocity of ferromagnetic nanowire on miscut sapphire substrate

Alternative Title

미스컷 사파이어 기판을 사용하여 강자성 나노와이어에서의 비등방성 피닝 포텐셜의 자구벽 속도 영향에 대한 연구

DGIST Authors

Weonjun Na ; Chun-Yeol You ; Jung-Il Hong

Advisor

유천열

Co-Advisor(s)

Jung-Il Hong

Issued Date

2023

Awarded Date

2023-02-01

Citation

Weonjun Na. (2023). The asymmetric pinning potential in domain wall velocity of ferromagnetic nanowire on miscut sapphire substrate. doi: 10.22677/THESIS.200000652152

Type

Thesis

Description

Domain wall velocity, asymmetric pinning potential, miscut sapphire substrate

Table Of Contents

Ⅰ. INTRODUCTION 1
Ⅱ. THEORATICAL BACKGROUND 2
2.1. Doman & Domain wall 2
2.1.1. Domain 2
2.1.2. Domain wall 3
2.2. Creep region DW velocity 4
2.3. Field driven DW motion 6
2.4. Sapphire Miscut Substrate 7
Ⅲ. MATERIAL&METHODS 8
3.1. Film deposition and patterning 8
3.1.1. Magnetron Sputtering 8
3.1.2. Photolithography 10
3.1.3. Etching 11
3.2. Magnetic Property Measurement 13
3.2.1. ViberationalSample Magnetometer (VSM) 13
3.3. Domain wall motion measurement 14
3.3.1. Polar-Kerr microscope 14
3.3.2. Domain wall nucleation and propagation 16
3.3.3. Define +MZ, -MZ initalization, propagation direction 18
3.3.4. In-plane angle dependence of pinning potential 20
Ⅳ. RESULTS&DISCUSSION 22
4.1. Substate Surface Evaluation 22
4.2. Magnetic properties 24
4.3. In-plane angle dependence of DW velocity 25
4.4 Comparsion of slope (α) and intercept (lnν0) on graph H-1/4- lnν 30
Ⅴ. CONCLUSION 33

URI

http://hdl.handle.net/20.500.11750/45719
http://dgist.dcollection.net/common/orgView/200000652152

DOI

10.22677/THESIS.200000652152

Degree

Master

Department

Department of Physics and Chemistry

Publisher

DGIST

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