Title

Development of nano-scaled spin materials and its applications

Alternative Title

스핀 나노 물질의 개발과 응용 연구

DGIST Authors

Yunji Eom ; CheolGi Kim ; Jaejong Lee

Advisor

김철기

Co-Advisor(s)

Jaejong Lee

Issued Date

2022

Awarded Date

2022/08

Citation

Yunji Eom. (2022). Development of nano-scaled spin materials and its applications. doi: 10.22677/thesis.200000631043

Type

Thesis

Subject

Spin materials, Magnetic nanoparticles, Spin-crossover, On-chip magnetometer

Description

Spin materials, Magnetic nanoparticles, Spin-crossover, On-chip magnetometer

Abstract

Table Of Contents

Ⅰ.Introduction 1
1.1 Spin materials 3
1.2 Magnetic nanoparticles 6
1.3 On chip magnetometer platform 9
1.4 In situ monitoring of synthesis nanoparticles 12
Ⅱ. Experiment detail 16
2.1 Synthesis of spin materials 17
2.1.1 Spin crossover nanoparticles 17
2.1.2 Fe3O4 magnetic nanoparticles 17
2.1.3 Au-Fe3O4 Janus magnetic nanoparticles 18
2.1.4 FePt-Fe3O4 hetero structure magnetic nanoparticles 20
2.2 Characterization for nanoparticles 21
2.2.1Transmission Electron Microscopy 21
2.2.2 X-ray diffraction 21
2.2.3 Vibrating Sample Magnetometer 22
2.2.4 Cell viability test 23
2.3 Fabrication of magnetometer platform 24
2.3.1 Photolithography 25
2.3.2 Magnetron sputtering system 27
2.3.3 Magnetoresistance measurement 29
Ⅲ. Theorical background 30
3.1 Basic of spin crossover materials 31
3.2 Formation of nanoparticles 32
3.3 Property of magnetic nanoparticles 34
3.4 Basics of PHMR Sensor 38
3.5 Detection of magnetic nanoparticles 40
Ⅳ. Results and discussion 43
4.1 Nano-scaled spin materials 44
4.1.1 Fe(pyrazine)[Pt(CN)4I] spin crossover nanoparticles 44
4.1.2 Au-Fe3O4 Janus magnetic nanoparticles 48
4.1.3 FePt-Fe3O4 hetero structure magnetic nanoparticles 54
4.2 Application of nano-scaled spin materials 64
4.2.1 Application as temperature sensing material 64
4.2.2 Application as targeting separation carrier 73
4.3 On chip magnetometer platform 76
4.3.1 Platform design for detection of magnetic nanoparticles 76
4.3.2 On chip magnetometer optimization 83
4.3.3 Validation test of on chip magnetometer 86
4.3.4 In situ monitoring of synthesis nanoparticles 89
Ⅴ. Summary 94
Reference 97
요약문 102
List of publications 104

URI

http://dgist.dcollection.net/common/orgView/200000631043
http://hdl.handle.net/20.500.11750/16806

DOI

10.22677/thesis.200000631043

Degree

Doctor

Department

Department of Physics and Chemistry

Publisher

DGIST

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