Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series SEM-LPTM-UCP
Subjects cond-mat
Date Friday 21 December 2018
Time 14:00
Institute LPTM
Seminar Room 4.13 St Martin II
Speaker's Last Name Manchon
Speaker's First Name Aurélien
Speaker's Email Address
Speaker's Institution KAUST, PSE-CEMSE , Thuwal, Saudi Arabia
Title Spin-Orbit Physics at Magnetic Interfaces
Abstract Chiral objects are ubiquitous in science and pose fundamental challenges, such as the importance of chiral molecules in commercial drugs or the dominance of matter over antimatter in the universe. Magnetic materials lacking inversion symmetry, called chiral magnets, constitute a unique platform for the exploration and control of chiral objects. In these systems, typically comprising multilayers of transition metal ferromagnets and heavy metals (W, Pt, Ta, Bi2Se3 etc.), interfacial spin-orbit coupling adopts a peculiar form, called Rashba-like interaction [1,2]. This interaction promotes a wealth of physical phenomena, among which the emergence of magnetic skyrmions – topological magnetic textures –, spin-orbit torques – an efficient means to electrically control magnetization dynamics –, as well as chiral magnetic damping – energy dissipation that depends on the texture chirality. Over the years, my group has developed several theoretical approaches to describe spin-orbit physics at interfaces, from minimal models to tight binding and first principle methods, in order to provide guidelines to better understand these effects. In this seminar, I will present various aspects of the interplay between spin transport and magnetization dynamics mediated by spin-orbit coupling in chiral magnets. I will first discuss the nature of interfacial spin-orbit coupling in magnetic multilayers and examine how it facilitates the onset of chiral magnetic textures [3]. I will then present the physics of spin-orbit torques [4,5], their general features in metals and specific characteristics in topological insulators [6]. Finally, the novel concept of chiral damping [7], i.e. the idea that energy dissipation depends on the chirality, will be introduced. In conclusion, I will show how such effects can be exploited to excite and control antiferromagnets and other frustrated magnets [8].
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