Matalla-Wagner, Tristan: Investigation of Néel-order spin-orbit torque switching in dc-sputtered CuMnAs thin films and identification of a parasitic contribution in the electrical [...]. 2021
Inhalt
- Introduction
- Fundamentals
- Magnetism
- Collective magnetism
- Magnetic anisotropy
- Magnetic domains
- Anisotropic magnetoresistance
- Magnetization dynamics
- The Néel-order spin-orbit torque
- The Rashba Effect
- The inverse Spin Galvanic Effect
- Torques acting on the Néel order
- The effective Néel-order spin-orbit torque field
- Relevance of thermal activation
- Experimental techniques
- Sample preparation
- Thin film growth
- Structural characterization
- Electrical characterization
- Lithography and electrical contacting
- The Lock-In technique
- Computational techniques
- Setup of the NSOT transport experiment
- Néel-order spin-orbit torque switching in sputtered CuMnAs
- CuMnAs sample preparation and characterization
- Experimental findings on CuMnAs
- Quantification of switching characteristics
- Dependence of the switching characteristics on sample temperature, current density, and pulse width
- Discussion of the thermally assisted switching in CuMnAs
- Kinetic Monte-Carlo model
- Summary on CuMnAs switching
- Resistive-nonmagnetic contribution in switching experiments
- Nb sample preparation and characterization
- Consequences of high current densities
- Experimental investigation
- Pulsing experiments with Nb thin films
- Pulsing experiments at Nb with simultaneous microdiffraction measurements
- Pulsing experiments at Nb with simultaneous electron microscopy
- Discussion of resistive contributions in switching experiments using simulations based on the finite-element-method
- Discussion of competing explanation approaches
- Summary on resistive contributions in switching experiments
- Conclusion and Outlook
- Bibliography
- List of Acronyms
- List of Figures
- List of Tables