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Spin orbit torques measurements in Pt-based heavy metal / Ferromagnet heterostructures with in-plane magnetic anisotropy

Vendredi 16 juin 2017 14:00 - Duree : 2 heures 30 minutes
Lieu : Salle des séminaires - bât A - Campus CNRS, 25 rue des martyrs - 38000 Grenoble

Orateur : Soutenance de Thèse de Alexandru TRIFU

Recent demonstrations of magnetization switching induced by in-plane current injection in heavy meta l (HM)/ferromagnet (FM) heterostructures have drawn increasing attention to spin-torques based on orbital-to-spin momentum transfer induced by Spin Hall and interfacial effects (SOTs). Unlike STT-MRAM, the in-plane current injection geometry of SOT-MRAM allows for a three-terminal device which decouples the “read” and “write” mechanisms, allowing the independent tuning of reading and writing parameters. However, an essential first step in order to control and optimize the SOTs for any kind of application, is to better understand their origin. The origin of the SOTs remains one of the most important unanswered questions to date. While some experimental studies suggest a SHE (Spin Hall Effect)-only model for the SOTs, others point towards a combined contribution of the bulk (SHE) and interface (Rashba Effect and Interfacial SHE). At the same time, many studies start with a SHE only hypothesis and do not consider interfacial effects. Furthermore, there are not so many systemati c studies on the effects of interfaces. This thesis tries to fill in this gap, by providing a systematic study on the effects of interfaces on the SOTs, in Pt-based NM/FM/HM multilayers with in-plane magnetic anisotropy. For this purpose, three different, but related avenues, are explored. First, the evolution of the Damping-Like and Field-Like effective fields is studied as a function of Pt layer thickness. Next, the properties of the interfaces are changed by modifying the crystallographic structure of the interface. Last but not least, we studied the influence of interface oxidation on the anatomy of the torques.

Contact : rachel.mauduit@cea.fr

Discipline évènement : (Physique)
Entité organisatrice : (INAC/SPINTEC)
Nature évènement : (Soutenance de thèse)
Site de l'évènement : Polygone scientifique

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