Magnetic Order and Coupling Phenomena: A Study of Magnetic Structure and Magnetization Reversal Processes in Rare-Earth-Transition-Metal Based Alloys and Heterostructures

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Springer, Jun 3, 2014 - Science - 121 pages
This thesis presents recent developments in magnetic coupling phenomena of ferrimagnetic rare-earth transition-metal Tb-Fe alloys and coupled systems consisting of ferri-/ferromagnetic heterostructures. Taking advantage of the tunability of the exchange coupling between ferrimagnetic and ferromagnetic layers by means of stoichiometry of the Tb-Fe layer, the variable number of repetitions in the Co/Pt multilayer as well as the thickness of an interlayer spacer, it is demonstrated that large perpendicular unidirectional anisotropy can be induced at room temperature. This robust perpendicular exchange bias at room temperature opens up a path towards applications in spintronics.
 

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Contents

1 Introduction
2
2 Thin Amorphous FeTb Alloy Films
5
3 CoPt Multilayers
19
4 ExchangeBias Effect in FFI RareEarthTransitionMetal Heterostructures
24
5 Experimental Techniques
31
A Temperature and Stoichiometry Dependent Study
51
Exchange Interaction and Magnetization Reversal
77
8 Interfacial Exchange Coupling in Heterostructures of FeTb Alloy Films and CoPt Multilayers
87
9 Interlayer Exchange Coupling Through Pt Spacer Layers in FeTbPtCoPt Heterostructures
109
10 Conclusions
116
Curriculum Vitae
119
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