Field-free magnetization switching in unconventional Hall bar system
- Title
- Field-free magnetization switching in unconventional Hall bar system
- Alternative Title
- 특수한 홀 바 시스템을 사용한 무-자기장 자화 스위칭 관찰
- Author(s)
- Hyeong-Joo Seo
- DGIST Authors
- Hyeong-Joo Seo ; Chun-Yeol You ; Jung-Il Hong
- Advisor
- 유천열
- Co-Advisor(s)
- Jung-Il Hong
- Issued Date
- 2023
- Awarded Date
- 2023-02-01
- Type
- Thesis
- Description
- Spin-orbit torque, Field-free magnetization switching, DMI, non-uniform current density, Oersted field, 수직 자기 이방성, 스핀 궤도 토크, DM 상호작용, Oersted 자기장, 무자기장 스위칭
- Table Of Contents
-
I. Introduction 1
II. Theoretical background 3
2.1 Spin-orbit torque 3
2.1.1 Spin-transfer torque (STT) and spin-orbit torque (SOT) magnetization switching 4
2.1.2 Field-free magnetization switching 4
2.2 Dzyaloshinskii-Moriya interaction 5
2.3 Electrical measurement based on anomalous Hall effect 7
III. Materials & Methods 8
3.1 Sample preparation 8
3.1.1 Magnetron Sputtering 8
3.1.2 Photolithography 10
3.1.3 Ion beam milling 11
3.2 Magnetic property measurement 12
3.2.1 Vibrational Sample Magnetometer (VSM) 12
3.2.2 Generalized Sucksmith-Thompson (GST) method 13
3.2.3 Brillouin light scattering (BLS) spectroscopy 14
3.3 Magnetization switching measurement 16
3.3.1 SOT induced magnetization switching measurement 16
3.3.2 External out-of-plane field induced magnetization switching measurement 16
3.4 Magneto-optic Kerr microscope (MOKE) 17
IV. Results and discussion 18
4.1 Sample geometry 18
4.2 Magnetic properties 20
4.3 Field-free & Field-assisted magnetization switching via electrical measurement 22
4.4 Magnetization switching measurement via Kerr microcope 24
4.5 Perpendicular external field induced magnetization switching measurement 26
4.6 Verifying the origin of field-free magnetization switching in our experiment 30
4.6.1 Non-uniform current density distribution 30
4.6.2 Tilted magnetization at edge of the structure (DMI) 32
4.6.3 Oersted field 34
V. Conclusion 37
VI. References 38
- URI
-
http://hdl.handle.net/20.500.11750/45774
http://dgist.dcollection.net/common/orgView/200000652296
- Degree
- Master
- Department
- Department of Physics and Chemistry
- Publisher
- DGIST
- Related Researcher
-
-
You, Chun-Yeol
- Research Interests Spintronics; Condensed Matter Physics; Magnetic Materials & Thin Films; Micromagnetic Simulations; Spin Nano-Devices
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- Appears in Collections:
- Department of Physics and Chemistry Theses Master
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