Post-doctoral position - Design and control of spin, orbital and charges orders in vanadates
Caen, Calvados
CDD
Temps-plein
Il y a 1 mois
Offer DescriptionThis post-doc is part of the ANR Project CITRON. This project is a partnership between IJL in Nancy and CRISMAT in Caen.Multiferroicity allows taking advantage of two coupled degrees of freedom like e.g. the electric polarization P and the magnetization M. Owing to the coupling between ferroelectricity and magnetism, magneto-electric (ME) materials allow controlling M (P) by an electric (magnetic) field.So far, the consideration of a pure spin current (a flow of electron spin momenta without charge transportation) in multiferroic materials is rather unexplored for reducing the power consumption. A pure spin current is generated in a non-magnetic heavy metal with strong spin-orbit coupling (SOC) through spin Hall effect (SHE): applying a charge current (Jc) results in a perpendicular flow of electrons (Jspin) of up and down spins moving in opposite directions. Considering the adjacent layer as a magnetic material, the injected pure spin current may act on its magnetization M through interfacial spin-orbit torque (SOT). If Jspin is injected into a compound that exhibits also spontaneous P, as in multiferroic materials, the interfacial spin transfer and the magnetic state might also depend on the electric polarization through electrostatic effect and/or interface atomic displacement effects.The materials for spin dependant phenomena used in information technologies and concepts often involve ferromagnets (FM) whose net magnetization is non zero without an external magnetic field. In contrast, antiferromagnets (AFM) display no or very weak net magnetic moment (with collinear or non-collinear spin alignment). The combination of these phenomena with specific properties of AFM like e.g. the robustness to disturbing magnetic field and the potential ultra-fast magnetization dynamics (0.1 - 1 THz) beyond FM resonance (GHz), might be interesting for applications. Last but not least, AFM are more abundant than FM on the planet. Nowadays, the exploration of the full magnetic potential of AFM leads to intense research efforts.The materials by design approach developed in CITRON offers new strategies to control spin orders and spin currents by an electric field instead of a magnetic field. Since monophasic magneto-electric multiferroics are however rather scarce, combining several coupled functionalities by design in superlattices has become a fertile and competitive field of research of material science and we propose to consider the case of the vanadate RVO3 (R = rare earth or yttrium), an antiferromagnetic insulator with a perovskite crystalline structure. Dealing with the interplay between crystalline structure, FE and antiferromagnetic RVO3 will also require to explore fundamental coupling mechanisms that are also generally encountered in other classes of oxide perovskite.RequirementsResearch Field Physics » Condensed matter properties Education Level PhD or equivalentSkills/QualificationsThe candidate should have a PhD in materials science. He/She should have significant experience in the two following area :- Thin films deposition by PLD, structural charactérisation of thin films (XRD..)- In order to test the effective coupling in the thin films and multilayers, the candidate will have a large access to the physical properties facilities of the CRISMAT (home made and commercial dielectric spectroscopy and polarization set-ups in PPMS under large magnetic field (14T), SQUID/VSM magnetometers). Dielectric anomaly at magnetic transitions and magnetoelectric (i.e field dependent capacitance measurements) will be specially investigated. It is expected from the candidate to deal with the different steps going from the contact preparation up to the data analysis in relationship with the crystallo-chemistry of the filmsLanguages ENGLISH Level ExcellentAdditional InformationSelection processTo apply, please submit the following documents :- Curriculum Vitae- Cover letter explaining your motivationsContact :Asso. Prof- materials chemistry - UNICAENAdditional commentsConditions- Duration : 16 months- Expected start date : September 1st 2024- Salary : depending on experienceWork Location(s)Number of offers available 1 Company/Institute Université de Caen Normandie - Crismat research unit Country France City Caen Postal Code 14050 Street 6 boulevard du Maréchal Juin GeofieldWhere to apply E-mailadrian.david@unicaen.frContact CityCaen WebsiteStreetEsplanade de la Paix 14032 CAEN CEDEX Postal CodeCS 14032 E-Mailadrian.david@unicaen.frSTATUS: EXPIRED