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자성반도체 개발의 최근 연구 동향:상온 강자성 반도체를 찾아서 / 김효진 3
Outline 4
Spintronics & magnetic semiconductors 5
Semiconductor spin electronics 6
3 memorable events for spintronics 7
Three issues of spin transport in SM 8
Spin light-emitting diode (LED) 9
Classes of magnetic semiconductors 10
Diluted magnetic semoconductors 11
Europium chalcogenides, EuX 12
II-VI based DMS 13
IV-VI based DMS 14
III-V based ferromagnetic DMS 15
Ferromagnetism in p-(Ga,Mn)As 16
Anomalous Hall effect in p-(Ga,Mn)As 17
Electric field control of FM 18
Light control of ferromagnetism 19
Control of magnetism in MS 20
Carrier-induced ferromagnetism in MS 21
Searching for RT ferromagnetic SM 22
Predicted Tc vs band gap 23
Materials design of FM DMS (1) 24
Material design of FM DMS (2) 25
Materials design of FM DMS (3) 26
MSs showing RT ferromagnetism 27
GaN-based DMS (1) 28
GaN-based DMS (2) 29
RT ferromagnetism in GaMnN films (1) 30
RT ferromagnetism in GaMnN films (2) 31
RT ferromagnetism in GaMnN films (3) 32
Ms enhancement in p-GaMnN:Mg films 33
RT ferromagnetism in p-(Ga,Mn)P:C 34
Oxide DMS (1) - ZnO based DMS 35
Formation of Co nanoclusters 36
Spin glass behavior in ZnCoO 37
AFM exchange coupling in ZnCoO 38
RT ferromagnetism in Zn1-xCrxTe 39
Oxide DMS (2) 40
Co clusters causes FM in TiCoO2 (1) 41
Co clusters causes FM in TiCoO2 (2) 42
FM in MOCVD-deposited TiCoO2 43
Magnetism in CoCu2O with codopants 44
RT ferromagnetism in La0.5Sr0.5(Ti,Co)O3-δ 45
II-IV-V2 Chalcopyrite DMS 46
RT Ferromagnetism in (Zn,Mn)GeP2 47
MnP clusters in (Zn,Mn)GeP2 48
Group-IV FM DMS: p-MnGe 49
Challenges for future developments 50
Key to ferromagnetism in DMS 51
Ferromagnetism in Diluted and Pure Semiconductors / Sunglae Cho 52
Collaborators 53
Outline 54
Spintronics 55
Diluted Magnetic Semiconductors (DMSs) 56
Electron Configuration 59
Cu-doped ZnO 60
Cu-doped ZnO 62
II-IV-V2 Chalcopyrite SC 64
Mn-ZnGeP2 65
Pure FM Semiconductors 66
Crystal Structure 67
Electronic structure 68
Thin Film Growth of MnGeP2 70
Characterization (XRD, RHEED) of MnGeAs2 films 71
p-n diode 73
R-T and Magnetic Properties of MnGeAs2 films 74
Hall/MR Measurement of MnGeAs2 films 75
R-T and Magnetic Properties of MnGeP2 films 76
Hall/MR Measurement of MnGeP2 films 77
Spin p-n diode 78
Ge1-xMnx 80
TiO2 88
IV diamond 92
Polymer-Bonded Magnetostrictive Composites / Sang Ho Lim 94
Magnetostriction? 95
Some Important Properties of Magnetostrictive Materials 97
Main Applications 98
Current Technology - Piezoceramics 99
New Technology - Magnetostrictive Materials 100
Magnetostrictive Composites - A New Solution 102
Fabrication Procedure - A Comparison 104
Rare Earth Based Composites 106
Terfenol-D Composites - Process Optimization 107
Terfenol-D Composites - Prestress Effect 111
Transition Metal Based Composites - Problems and Solutions 112
Magnetostrictive Properties of Some Transition Metal Based Alloys 113
Conclusions 126
Magnetic nanocomposites and their applications / Choong Jin Yang 127
Magnetic materials are everywhere 128
Nanocrystalline structure and interface 129
Nanocomposites magnet 130
Preparation of nanocomposites 131
Magnetic characteristics of nanocomposites 132
Magnetic length scales (in nm) 133
Applications of magnetic nanocomposite 134
(1) Magnetic recording process 134
(2) Recording media 135
(3) Recording Head 136
Typical published results of GMR 137
Integration of MRAM 138
The State of the Art of GMR Structures 139
Nano granular Co particles embedded in AlN insulator New Approach - Patentable 140
Nanoscale discontinuous multilayer films 141
Magnetic transport takes place 143
Coulomb Blockade barrier energy 144
Read head sensor(proposal) 145
4. Soft magnetic nanocomposite 146
Magnetic loss: eddy current loss is a key 147
(5) Hard magnetic nanocomposite 148
(6) Magnetic dendrimers 152
(7) Magnetic refrigerator 155
(8) New magnetic refrigerants 157
Summary 158
바이오칩 자기감지기술 개발 현황 / 김철기 159
충남대 자성 연구 활동 (ReCAMM) 160
국제협력 연구기관 161
1. 바이오 칩 감지 기술 개요 163
DNA Chip이란? 164
DNA Chip의 개발 배경은? 165
측정원리 166
칩 종류 167
종래의 방법 168
Single DNA 감지기술 : DNA 결합력 169
Single DNA 감지기술 : 자기력 170
자기감지기술 171
Single DNA 감지기술 : 자기센서 172
Single DNA 감지기술 : Optic 방법 173
성능 비교 174
바이오 칩 센서 소자 양산화 175
한미일의 biochip 연구개발 투자 (자료:삼성종기원/박유근) 176
국내 바이오 칩 연구현황 177
2. 자기 감지기술 개발현황 178
자기 감지기술 179
Magnetoresistance ? 180
Anisotropic magnetoresistance (cont.) 181
Planar Hall Resistance 182
Giant magnetoresistance 183
Tunneling magnetoresistance (터널링 자기저항] 184
Giant magnetoimpedance [거대 교류자기저항] 185
Developed magnetometers 186
Stanford-IBM-MIT (미국) 187
Naval Research Laboratory 188
INESC (포르투갈) 189
센서 및 감지 특성 190
Bielefeld U. (독일) 191
센서 및 탐지 신호 192
센서 분해능 193
TMR 센서 194
주요 연구 기관 분해능 195
연구 개선점 196
감지 분해능 제한 197
3. 자기 소자 재료 연구 198
Role of exchange coupling on TMR 199
2-D 전류분포 203
Development concept of GMI-valve 204
GMI-valve characteristics 205
4. 결론 206
향후 연구 방향 207
추진 일정 208
마무리 209