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Hübner, Torsten: The tunnel magneto-Seebeck effect in magnetic tunnel junctions with MgAl2O4 barrier: paving the way towards spin caloritronic applications. 2017
Inhalt
1 Motivation
I Theory
2 Magnetic tunnel junctions
2.1 The tunnel magnetoresistance effect
2.2 Coherent tunneling
2.3 Current-voltage characteristics
2.3.1 The Simmons model
2.3.2 The Brinkman model
3 The tunnel magneto-Seebeck effect
3.1 The Seebeck effect
3.2 Sign and size of the Seebeck effect
3.3 Theory of the tunnel magneto-Seebeck effect
3.4 Measuring the tunnel magneto-Seebeck effect
II Experiment
4 Materials
4.1 Fabrication of magnetic tunnel junctions
4.2 MgO and MgAl2O4 as tunnel barrier
5 Methods
5.1 Setup for transport measurements
5.1.1 TMR and I/V measurements
5.1.2 TMS measurements
5.2 Determination of the beam waist
5.3 COMSOL simulations
5.4 Analysis of I/V curves
III Results & discussion
6 Tunnel magnetoresistance, magneto-Seebeck, and I/V measurements
6.1 Tunnel magnetoresistance results
6.2 Tunnel magneto-Seebeck results
6.2.1 Tunnel magneto-Seebeck effect in magnetic tunnel junctions with MgAl2O4 barrier
6.2.2 MgAl2O4 and MgO thickness variation
6.3 I/V curves
6.4 Brinkman parameters
6.5 Comparison of laser-induced and intrinsic TMS
7 Determination of thermal profiles via COMSOL simulations
8 Thermovoltages and Seebeck coefficients
IV Summary & Outlook
9 Summary & Outlook
V Appendices
A. Wentzel-Kramers-Brillouin approximation
B. MATLAB interpolation procedure
C. Publications
D. Conferences and colloquiums
VI. Bibliography