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Catégorie : Soutenances de thèse et de HDR

Mercredi 16 septembre 2020 : Soutenance de HDR de Juan-Carlos ROJAS-SANCHEZ : Different spin current sources : from interfaces to bulk materials

Juan-Carlos ROJAS-SANCHEZ chercheur au sein de l'équipe "Nanomagnétisme et Electronique de Spin"de l'Institut Jean Lamour, soutient son Habilitation à Diriger des Recherches intitulée :

"Different spin current sources : from interfaces to bulk materials"


Date et lieu :

Mercredi 16 septembre 2020 à 14h00
Campus Artem / Nancy
Amphithéâtre 200
Limité à 80 personnes


Composition du jury :

Rapporteurs :

- Mme Julie GROLLIER
UMPhy CNRS/Thales                  

- M. Andrew KENT       
New York UNiversity                  

ICN2, Univ. Aut. de Barcelona  

Examinateurs :

- Mme. Ingrid MERTIG  
Martin-Luther-Universität Halle-Wittenberg 

- M. Albert FERT   
UMPhy CNRS/Thales

- M. Olivier FRUCHART  
SPINTEC (Univ. Grenoble Alpes, CNRS, CEA)

ETH Zurich 

- M. François MONTAIGNE
Institut Jean Lamour, Université de Lorraine


Abstract :
This HDR qualification report provides a summary of my work during the last 8 years of my scientific career, after the conclusion of my doctoral thesis. The first chapter offers a general introduction of classical spintronics to end with relatively new concepts and the birth of the spin-orbitronics field. These concepts are based on the conversion of a charge current (electrical current) into a pure spin current by means of the spin-orbit coupling. Their manifestations in the bulk are called spin Hall effect and spin anomalous Hall effect. And in the interfaces it is called Edelstein effect and it occurs in the Rashba interfaces, topological insulators and two-dimensional systems with spin texture. The following chapters present my experimental results based on the direct or inverse effects of these conversions either in bulk or in interfaces.
Such experimental results are mainly based on lateral spin valve nano devices, on spin pumping by ferromagnetic resonance, and spin torque by ferromagnetic resonance. A chapter is dedicated to my results of current-induced magnetization switching or spin-orbit torque. That is the ultimate goal for applications in new types of magnetic memory. Throughout the manuscript I discuss perspectives, open questions and new projects, and the last chapter is dedicated to ongoing or newly initiated projects with encouraging preliminary results.