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Parts of this thesis have been published in the following journal articles:; Supervisors' Foreword; Preface; Acknowledgments; Contents; Symbols; Part I Introduction to Organic and Molecular Spintronics ; 1 Introduction to Spintronics; 1.1 Electronic Structure of Ferromagnetic Metals; 1.1.1 Conduction in Ferromagnetic Metals; 1.1.2 Spin Polarization Measurement; 1.2 Principle of a Basic Spintronic Device; 1.3 Tunnel Magnetoresistance; 1.3.1 Jullière's Model; 1.3.2 Development of Magnetic Tunnel Junctions; 1.3.3 Characteristics of Tunnel Magnetoresistance, Beyond Jullière's Model; References
2 Why Bring Organic and Molecular Electronics to Spintronics2.1 Introduction to Organic and Molecular Electronics; 2.2 Main Difference Between Organic and Inorganic Materials; 2.2.1 Behaviour at the Interface; 2.2.2 Electronic Properties of Molecules; 2.3 Advantages of Organic and Molecular Materials for Spintronics; References; 3 State of the Art in Organic and Molecular Spintronics; 3.1 Introduction to Organic and Molecular Spintronics; 3.2 Spinterface; 3.2.1 A Model to Explain Spintronics Tailoring Through Molecular Spin Hybridization
3.2.2 Experimental Evidence of Spin Polarization Tailoring3.3 Conclusion; References; Part II Self-Assembled Monolayers for Molecular Spintronics ; 4 Introduction to Self-Assembled Monolayers; 4.1 Why Self-Assembled Monolayers?; 4.1.1 Influence of the Molecular Body; 4.1.2 Influence of the Head and Anchoring Group; 4.1.3 And for Spintronics?; 4.2 How to Contact Self-Assembled Monolayers; 4.2.1 Examples of Contacting Methods; 4.3 Transport in Self-Assembled Monolayers; 4.3.1 Introduction to the Main Models of Direct Tunneling; 4.3.2 Transition Voltage Spectroscopy (TVS)
4.4 Application to Devices: The Alkyl-Chain Case4.4.1 Where Does the Electron Go?; 4.5 State of the Art on SAMs-Based Magnetic Tunnel Junctions for Spintronics; References; 5 SAMs Based Device Fabrication and Characterization; 5.1 Choice of Device Geometry; 5.2 Choice of the Bottom Electrode; 5.3 Self-Assembled Monolayers Grafting Over LSMO; 5.3.1 Grafting Protocol for SAMs Over LSMO; 5.3.2 Characterization of SAMs Grafted Over LSMO; 5.4 Fabrication of the Nanojunctions; 5.4.1 First Step: Optical Lithography; 5.4.2 Second Step: Nanoindentation Lithography
5.4.3 Third Step: Self-Assembled Monolayer Deposition5.4.4 Fourth Step: Top Electrode Deposition and Sample Bonding; References; 6 Magneto-Transport Results in SAM Based MTJs; 6.1 Experimental Set-Up; 6.2 Inelastic Electron Tunneling Spectroscopy; 6.3 Magneto-Transport Results on LSMO/C12P/Co Nanojunctions; 6.3.1 Electrical Characterization of the Nano-Junctions; 6.3.2 Tunnel Magnetoresistance; 6.4 Magneto-Transport Results by Tuning the Molecular Thickness; 6.4.1 Resistance Dependence on Molecular Chain Length; 6.4.2 TMR Dependence on Molecular Chain Length; 6.5 Conclusions; References
2 Why Bring Organic and Molecular Electronics to Spintronics2.1 Introduction to Organic and Molecular Electronics; 2.2 Main Difference Between Organic and Inorganic Materials; 2.2.1 Behaviour at the Interface; 2.2.2 Electronic Properties of Molecules; 2.3 Advantages of Organic and Molecular Materials for Spintronics; References; 3 State of the Art in Organic and Molecular Spintronics; 3.1 Introduction to Organic and Molecular Spintronics; 3.2 Spinterface; 3.2.1 A Model to Explain Spintronics Tailoring Through Molecular Spin Hybridization
3.2.2 Experimental Evidence of Spin Polarization Tailoring3.3 Conclusion; References; Part II Self-Assembled Monolayers for Molecular Spintronics ; 4 Introduction to Self-Assembled Monolayers; 4.1 Why Self-Assembled Monolayers?; 4.1.1 Influence of the Molecular Body; 4.1.2 Influence of the Head and Anchoring Group; 4.1.3 And for Spintronics?; 4.2 How to Contact Self-Assembled Monolayers; 4.2.1 Examples of Contacting Methods; 4.3 Transport in Self-Assembled Monolayers; 4.3.1 Introduction to the Main Models of Direct Tunneling; 4.3.2 Transition Voltage Spectroscopy (TVS)
4.4 Application to Devices: The Alkyl-Chain Case4.4.1 Where Does the Electron Go?; 4.5 State of the Art on SAMs-Based Magnetic Tunnel Junctions for Spintronics; References; 5 SAMs Based Device Fabrication and Characterization; 5.1 Choice of Device Geometry; 5.2 Choice of the Bottom Electrode; 5.3 Self-Assembled Monolayers Grafting Over LSMO; 5.3.1 Grafting Protocol for SAMs Over LSMO; 5.3.2 Characterization of SAMs Grafted Over LSMO; 5.4 Fabrication of the Nanojunctions; 5.4.1 First Step: Optical Lithography; 5.4.2 Second Step: Nanoindentation Lithography
5.4.3 Third Step: Self-Assembled Monolayer Deposition5.4.4 Fourth Step: Top Electrode Deposition and Sample Bonding; References; 6 Magneto-Transport Results in SAM Based MTJs; 6.1 Experimental Set-Up; 6.2 Inelastic Electron Tunneling Spectroscopy; 6.3 Magneto-Transport Results on LSMO/C12P/Co Nanojunctions; 6.3.1 Electrical Characterization of the Nano-Junctions; 6.3.2 Tunnel Magnetoresistance; 6.4 Magneto-Transport Results by Tuning the Molecular Thickness; 6.4.1 Resistance Dependence on Molecular Chain Length; 6.4.2 TMR Dependence on Molecular Chain Length; 6.5 Conclusions; References