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Theses

Domaines magnétiques périodiques pour la propagation guidée d’ondes de spin

Abstract : The International Technology Roadmap for Semiconductors has identified spin wave devices as an alternative to CMOS technology for logic devices. The interest of these emerging devices lies in the scalability needed to process the ever-increasing amount of data generated by our information and communication society while maintaining low power consumption. However, standard devices suffer from drawbacks related to miniaturization and do not offer the possibility to enter the field of fully reprogrammable logic devices. The objective of my thesis is to establish a new path towards scalable and reprogrammable logic devices. This path is based on the stabilization of rectilinear periodic magnetic domains whose orientation can be configured to open or close the transmission channel. This channel will be formed in a low-damping material for spin wave propagation over micron distances. On one hand, magnetic domains of the Weak Stripes type have been obtained in the Co₄₀Fe₄₀B₂₀ alloy. We have shown that these domains are easily orientable, which will allow to easily open or close the transmission channel of spin waves. We show that a damping lower than 7×10⁻³ can be obtained. Magnetic microscopy allowed us to determine the angle of magnetization in the stripes, its spatial distribution as well as its variation under magnetic field. In addition, we show for the first time the surface configuration of these Weak Stripes, a configuration in accordance with the micromagnetic simulations. On the other hand, Strong Stripes magnetic domains are obtained in the [Co/Ni]n multilayers. Their properties are close to those observed in other materials such as Co epitaxial films. A damping coefficient lower than 8.8 ×10⁻³ is obtained, among the smallest for perpendicular magnetization systems. The study of their microscopic magnetic properties shows that the orientation of straight domains is more difficult to obtain because of a stripe/bubble transformation which has not yet been documented in the literature.
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https://hal.univ-lorraine.fr/tel-03356700
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Submitted on : Tuesday, September 28, 2021 - 12:15:03 PM
Last modification on : Sunday, June 26, 2022 - 3:13:59 AM
Long-term archiving on: : Wednesday, December 29, 2021 - 6:29:20 PM

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  • HAL Id : tel-03356700, version 1

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Kosseila Aït Oukaci. Domaines magnétiques périodiques pour la propagation guidée d’ondes de spin. Physique [physics]. Université de Lorraine, 2021. Français. ⟨NNT : 2021LORR0100⟩. ⟨tel-03356700⟩

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