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Iridium-based synthetic ferrimagnets for spintronics

Abstract : Synthetic ferrimagnets with perpendicular magnetic anisotropy have been studied extensively in the past decades. Their outstanding properties in terms of spintronics, especially concerning the current-induced magnetic domain wall propagation lead us to contemplate them as promising candidates as materials for magnetic racetrack memories. Besides, considering the remarkable properties of iridium concerning the transport and the generation of pure spin currents by means of spin orbit torque, as well as its large RKKY coupling properties, this material seems to be an excellent material as a spacer for synthetic ferrimagnets. In this manuscript, we study magnetic multilayers composed of two magnetic layers of cobalt separated by an iridium spacer. We optimise the growth of these multilayers by choosing the most adequate thicknesses, so as to obtain a model system for racetrack memories applications. Thus, we maximise the antiferromagnetic exchange between the cobalt layers, and the remanence magnetisation. Besides, we study the spin current generation and transport properties of iridium by spin pumping ferromagnetic resonance means. We draw the conclusion that iridium-based synthetic ferrimagnets can be considered as model systems for racetrack memory technology.
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Submitted on : Tuesday, January 11, 2022 - 4:15:14 PM
Last modification on : Sunday, June 26, 2022 - 3:31:34 AM
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  • HAL Id : tel-02863420, version 1


Thibaud Fache. Iridium-based synthetic ferrimagnets for spintronics. Physics [physics]. Université de Lorraine, 2020. English. ⟨NNT : 2020LORR0011⟩. ⟨tel-02863420⟩



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