Title

Artificial tilted of spin structure of a cobalt thin film within a Co/VOx magnetic heterostructure

DGIST Authors

Kwonjin Park ; Chun-Yeol You ; June-Seo Kim

Advisor

유천열

Co-Advisor(s)

June-Seo Kim

Issued Date

2025

Awarded Date

2025-02-01

Citation

Kwonjin Park. (2025). Artificial tilted of spin structure of a cobalt thin film within a Co/VOx magnetic heterostructure. doi: 10.22677/THESIS.200000845463

Type

Thesis

Description

Vanadium oxide (VOx), Interfacial Dzyaloshinskii-Moriya interaction (iDMI), Perpendicular magnetic anisotropy (PMA), Brillouin light scattering spectroscopy (BLS), MOKE (Magneto-optical Kerr effect)

Table Of Contents

List of Contents

Abstract i
List of contents ii
List of figures iv

I. Introduction 1

IⅠ. Theoretical backgrounds 7
2.1 Exchange interaction 7
2.1.1 Heisenberg exchange interaction 7
2.1.2 Dzyaloshinskii-Moriya interaction 9
2.2 Magnetic anisotropy energy 13
2.2.1 Magneto-crystalline anisotropy 13
2.2.2 Shape magnetic anisotropy 17
2.2.3 Interfacial magnetic anisotropy 21
2.3 The other magnetic energies 24
2.3.1 Zeeman energy· 24
2.3.2 Landau-Lifshitz-Gilbert equation 25
2.4 Spin wave 30
2.4.1 Basic concept of spin wave 30
2.4.2 Mechanism of inelastic scattered light 33
2.5 Hall effect 35

IIⅠ. Fabrication process and Experiment tools 39
3.1 Magnetic multilayer deposition 39
3.2 Experimental tools 42
3.2.1 Magneto-optical Kerr effect 42
3.2.2 SQUID-VSM measurements 45
3.2.3 Physical properties measurement system and transport measure 46
3.2.4 Transmission Electron Microscope-Electron Energy Loss Spectroscopy 47


ⅠV. Result and discussion 52
Ferromagnetism of pure vanadium oxide and their magnetic properties 53
4.1 Overview 53
4.2 Introduction 54
4.3 Experimental results and discussion 56
4.4 Summary 75

V. Result and discussion 77
Unconventional energy occurring in vanadium oxide and the ferromagnetic layer 78
5.1 Overview 78
5.2 Introduction 79
5.3 Experimental result and discussion 81
5.4 Summary 90

VI. References 92

URI

http://hdl.handle.net/20.500.11750/58004
http://dgist.dcollection.net/common/orgView/200000845463

DOI

10.22677/THESIS.200000845463

Degree

Doctor

Department

Department of Physics and Chemistry

Publisher

DGIST

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