Bouchikhaoui, Houari: Nanoanalysis by atom probe tomography of tunnel magnetoresistive (TMR) structures. 2016
Inhalt
- Abstract
- Zusammenfassung
- 1 Introduction and Motivation
- 2 Magnetism
- 2.1 Dia- Paramagnetism
- 2.2 Ferromagnetism
- 2.3 Magnetic domains
- 2.4 Hysteresis
- 2.5 Magnetic anisotropy
- 2.5.1 Magnetocrystalline anisotropy
- 2.5.2 Shape anisotropy
- 2.5.3 Stress anisotropy
- 2.5.4 Exchange anisotropy (Exchange bias)
- 2.6 Band magnetism
- 2.7 The Magnetoresistance
- 2.7.1 Anisotropic Magnetoresistance
- 2.7.2 Giant magnetoresistance GMR
- 2.7.3 Tunnel magnetoresistance TMR
- 2.7.4 Jullière Model
- 2.8 Spin polarized Tunneling
- 2.9 Heusler alloys
- 2.10 Half metals
- 3 Material Science of Magnetic Alloys
- 3.1 Ferromagnetic alloys
- 3.2 Interfaces, lattice structures and epitaxy
- 3.3 Diffusion and segregation in solids
- 3.4 Diffusion Mechanisms
- 3.5 Segregation at Interfaces
- 4 Principles of Field Ion Microscopy and Atom Probe Tomography
- 4.1 Field Emission (electron) Microscopy (FEM)
- 4.2 Field Ion Microscopy (FIM)
- 4.3 Atom Probe Tomography (APT)
- 5 Experimental Setup and Sample Preparation
- 5.1 Sample preparation for FIM and APT
- 5.2 Sample preparation for TEM
- 5.3 Ion Beam Sputtering
- The W/CoFeB/Ta system
- 5.4 The W/CoFeB/Ta/MgO system
- 5.5 Heusler Alloy Co2MnSi
- 5.6 Microscopy
- 6 Nanoanalysis of Ta/CoFeB/MgO structure
- 7 Investigation of Co2MnSi Heusler alloy with MgO barrier
- 7.1 Structure and thermodynamics
- 7.2 Magnetic properties
- 7.3 APT measurement
- 7.4 Summary and Conclusion
- 9 Conclusion
- Acronyms
- List of symbols
- Literature