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Table of contents
Chapter I – Basics of magnetism and spin orbit torque
1.1 Origin of magnetization
1.2 Magnetic interactions
1.2a) Zeeman interaction
1.2b) Dipolar interaction
1.2c) Magnetocrystalline and effective anisotropy
1.2d) Exchange interaction
1.2e) DMI interaction
1.3 Magnetic orders
1.4 Spintronics
1.5 Spin Hall effect (SHE) – Spin Orbit Torque (SOT)
1.5.1 Spin Hall effect (SHE)
1.5.2 Mechanism of the SHE
1.5.3 Efficiency of SHE
1.5.4 Spin Orbit Torque
1.5.4 Damping-like (DL) and field-like (FL) torques
1.6 All Optical Switching
Chapter II – Experimental methods and samples
2.1 Thin film deposition by DC magnetron sputtering
2.2 Vibrating Sample Magnetometry (VSM)
2.3 Lithography process
2.4 Magneto-transport (spin-orbit torque) setup
Chapter III – Spin-orbit torque induced switching in ferrimagnetic alloys: Experiments and modeling
3.1 Introduction
3.2 Samples and magnetic properties
3.3 Theoretical model
3.4 Results of transport measurements
3.5 Analytical model
3.6 Conclusion
Chapter IV – The effect of temperature on magnetization switching by spin-orbit torque in metal/ferrimagnetic system
4.1 Introduction
4.2 Samples and magnetic properties
4.2.1 Magnetic compensation point xMcomp
4.2.2 Compensation temperature TMcomp
4.2.3 Angular momentum compensation temperature TAcomp
4.2.4 Field – induced magnetization switching
4.2.5 Determination of Hall angle AHE in CoxTb1-x (3.5nm)
4.3 Current – induced spin orbit torque switching
4.4 Characteristic temperatures of switching
4.5 T-x switching phase diagram
4.6 Conclusions
References
