PhD: Numerical studies of magnetic textures in axisymmetric samples in the presence of Dzyaloshinskii-Moriya effect and spin polarized current (M/F)

Job Description

Thesis Subject

This thesis project is part of the multi-partner ANR-DIWINA project (Néel, Spintec, CMAP, INRIA), whose goal is to develop an open-access digital twin platform for spintronics. This is an ambitious project from both a physics and software development perspective, carried out in close collaboration with computational physicists affiliated with DIWINA. The student's project, based at the Néel laboratory, will lie at the interface between fundamental physics—with the incorporation of new physical terms such as the Dzyaloshinskii-Moriya interaction (DMI) [Dzy, Mor] and the extraordinary Hall effect (spintronics) into our open-source FeeLLGood software platform, which is freely accessible to the scientific community (https://feellgood.neel.cnrs.fr/) As outlined in the DIWINA project, the student will initially be responsible for the mathematical analysis and implementation of the DMI interaction. This interaction gives rise to specific spin structures, such as chiral domain walls and skyrmions, which are particularly relevant in our context. In practice, the effective micromagnetic field in the Landau–Lifshitz–Gilbert equation must be supplemented by a term proportional to ∇ × m, whose proportionality factor can be obtained from ab initio calculations [Yan]. The introduction of all these terms into the numerical formulation of the magnetization dynamics equation must be carried out with great caution. The physical structure of the equations (e.g., energy dissipation) must be preserved in order to obtain the correct dynamics. The stability and order of convergence of the proposed method must be studied in parallel with the development of the code. In a second phase, following up on the DIWINA project, we plan to incorporate new spintronic terms to address the dynamics of magnetic textures—such as domain walls—in new core-shell tubular systems, as well as in nanowires studied experimentally in the laboratory. The student will implement the numerical analysis tools developed as part of DIWINA. On a day-to-day basis, the student will be responsible for the mathematical development of formulations, testing their implementation in FeeLLGood, conducting a large number of micromagnetic simulations, analyzing the generated results, and synthesizing them in reports.

Expected skills:
- solid-state physics, transport, magnetism and micromagnetism, spin waves
- data visualization and analysis
- modeling and numerical methods
- programming (C++ and Python)

Your Work Environment

The candidate will join a small team whose core expertise lies in micromagnetic simulation and transport, as well as a larger team with expertise in magnetic imaging techniques. The candidate's work will focus on improving existing numerical simulation tools for specific textures in axisymmetric samples in the presence of DMI and spin-polarized transport.

The candidate will be expected to join a team that works across both Spintec and the Institut Néel. In addition, the student will play a leading role in writing articles for peer-reviewed international journals.

Institut NÉEL is a CNRS unit (UPR 2940) under agreement with the University Grenoble Alpes. The laboratory is related to the CNRS Physique. It is located in Grenoble, in the heart of a unique scientific, industrial and cultural environment. It is one of the largest French national research institutes for fundamental research in condensed matter physics enriched by interdisciplinary activities at the interfaces with chemistry, engineering and biology. It consists of 450 employees, including 175 researchers.
CNRS is a public, scientific and technological organization.
The core mandate is to identify, to carry out or to have carried out, either alone or with partners, all research that advances science or contributes to the country's economic, social, and cultural progress. Internationally recognized for the excellence of its scientific research, the CNRS is a reference in the world of research and development, as well as for the general public.

The hosting team at Institut Néel is MNM - Micro and Nanomagnetism, which forms part of the QUEST department.

Compensation and benefits

Compensation

2300 € gross monthly

Annual leave and RTT

44 jours

Remote Working practice and compensation

Pratique et indemnisation du TT

Transport

Prise en charge à 75% du coût et forfait mobilité durable jusqu’à 300€

About the offer

About the CNRS

The CNRS is a major player in fundamental research on a global scale. The CNRS is the only French organization active in all scientific fields. Its unique position as a multi-specialist allows it to bring together different disciplines to address the most important challenges of the contemporary world, in connection with the actors of change.

CNRS

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