DGIST Scholar: Lateral symmetry breaking for spin-orbit torque induced field-free switching using miscut sapphire substrate

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Lateral symmetry breaking for spin-orbit torque induced field-free switching using miscut sapphire substrate

Title: Lateral symmetry breaking for spin-orbit torque induced field-free switching using miscut sapphire substrate

Description: Spin-orbit torque, field-free switching, symmetry breaking, miscut

Table Of Contents: I. INTRODUCTION 1
II. THEORETICAL BACKGROUND 3
2.1 Spin-orbit Torque (SOT) 3
2.2 Spin-transfer torque (STT) and Spin-orbit torque (SOT) based magnetization switching 5
2.3 Field-free Spin-orbit Torque Switching 6
2.4 Sapphire Miscut Substrate 8
2.5 Magnetic Anisotropy 9
2.5.1 Shape Anisotropy (Demagnetization) 10
2.5.2 Magnetocrystalline Anisotropy 11
2.5.3 Zeeman energy 11
III. MATERIALS & METHODS 14
3.1 Film deposition and patterning 15
3.1.1 Magnetron Sputtering 16
3.1.2 Photolithography 17
3.1.3 Etching 20
3.2 Magnetic Property Measurement 21
3.2.1 Vibrational Sample Magnetometer (VSM) 21
3.2.2 Anomalous Hall effect (AHE) Magnetometry 22
3.2.3 Generalized Sucksmith-Tompson (GST) method 26
3.2.4 Separation of AHE and Planar Hall effect(PHE) 27
3.3 SOT measurement 28
3.3.1 Harmonic Hall voltage measurement 29
3.3.2 Current Induced Magnetization Switching 30
IV. RESULTS & DISCUSSION 32
4.1 Substrate Surface Evaluation 32
4.2 Magnetic properties 35
4.3 Additional In-plane Magnetic Anisotropy by Miscut Sapphire Substrate 37
4.4 Current Induced Magnetization Switching by SOT 40
4.5 Field-free Switching by SOT 46
V. CONCLUSION 49

URI: http://dgist.dcollection.net/common/orgView/200000596416

http://hdl.handle.net/20.500.11750/16300

Related Researcher

You, Chun-Yeol
Research Interests Spintronics; Condensed Matter Physics; Magnetic Materials & Thin Films; Micromagnetic Simulations; Spin Nano-Devices

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