Title

Observation of multi-states anomalous Hall resistance due to domain wall motion in a single Hall bar for the neuromorphic applications

DGIST Authors

You, Chun Yeol ; Kim, Yoonui ; Hong, Jung-Il

Advisor

유천열

Co-Advisor(s)

Jung-Il Hong

Issued Date

2019

Awarded Date

2019-08

Citation

Yoonui Kim. (2019). Observation of multi-states anomalous Hall resistance due to domain wall motion in a single Hall bar for the neuromorphic applications. doi: 10.22677/thesis.200000217289

Type

Thesis

Description

시냅스 모방소자, 멤리스티브 특성, 자구벽 운동, 이상 홀 효과

Table Of Contents

Ⅰ. INTRODUCTION 1
Ⅱ. THEORTICAL BACKGROUND
2.1 DW types in perpendicular magnetic anisotropy 3
2.2 Landau-Lifshitz and Gilbert equation (LLG equation) 8
2.3 Field-induced pinning / depinning of DW 10
2.4 Anomalous Hall Effect 13
2.5 Polar Magneto-Optic Kerr microscopy 15
Ⅲ. DEVICE FABRICATION TECHNIQUE
3.1 DC magnetron sputtering 20
3.2 Photolithography 24
3.3 Ion beam milling system 26
3.4 E-beam evaporator 28
Ⅳ. RESULTS & DISCSSUION
4.1 Film characterization 30
4.2 Memristive functionality originated from DW movement 35
4.3 Spintronics synapses for artificial neural network 38
4.4 Correlation between the change of R_H and DW pinning process 42
4.5 The number of multi-states in R_H as a function of field intensity 45
4.6 The variation of R_H for the different τ_d of field 47
4.7 R_H in various shape according to the number of field pulses 49
4.8 STDP learning rules related with pulse conditions 53
4.9 Various shape of R_H by modulating the polarities 56
4.10 Potentiation and depression of R_H with DW motion 59
Ⅴ. CONCLUSION 62
Ⅵ. REFERENCE 63

URI

http://dgist.dcollection.net/common/orgView/200000217289
http://hdl.handle.net/20.500.11750/10461

DOI

10.22677/thesis.200000217289

Degree

Master

Department

Department of Emerging Materials Science

Publisher

DGIST

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