Investigation of Magnetic Properties for Fe- and Te-doped MnBi2Se4
- 주제어 (키워드) Magnetism , Magnetic phase transition , Exchange interaction , Ferromagnet , Antiferromagnet , Magnetic semiconductor; 자성 , 자기 상전이 , 강자성체 , 반강자성체 , 교환 상호작용 , 자기 반도체
- 발행기관 서강대학교 일반대학원
- 지도교수 정명화
- 발행년도 2024
- 학위수여년월 2024. 2
- 학위명 박사
- 학과 및 전공 일반대학원 물리학과
- 실제URI http://www.dcollection.net/handler/sogang/000000077184
- UCI I804:11029-000000077184
- 본문언어 영어
- 저작권 서강대학교 논문은 저작권 보호를 받습니다.
목차
I. Introduction 1
A. Magnetism 1
i. Langevin Theory of Paramagnetism 2
ii. Exchange Interaction 6
iii. Curie-Weiss Law 8
iv. Bound Magnetic Polaron 11
B. Introduction to MPn2Ch4 Compounds 13
II. Experiment Details 21
A. Sample Preparation 21
B. Sample Verification 23
C. Magnetic Measurements 24
D. Electrical Measurements 25
E. X-ray Photoelectron Spectroscopy 26
III. Results and Discussion 27
A. Modification of Magnetic Transitions in Fe-doped MnBi2Se4 27
i. Introduction 27
ii. Sample Verification 29
iii. Electrical Properties 32
iv. Temperature-dependent Magnetic Properties 34
ⅴ. Field dependent Magnetic Properties at Low Temperature 39
ⅵ. Magnetic Analyses for Mn1-xFexBi2Se4 43
ⅶ. Conclusion 49
B. Te Doping Effect on Magnetic Properties of Te-doped MnBi2Se4 51
i. Introduction 51
ii. Sample Verification 53
iii. Field- and Temperature-dependent Magnetic Properties 56
iv. Discussion on XPS Analyses 60
ⅴ. Discussion on Magnetic Structure by Magnetic Analyses 65
ⅵ. Conclusion 69
Ⅳ. Conclusion 70
Ⅴ. References 73
