Name of the laboratory: IM2NP
Thesis advisor: Dolocan Voicu, Sylvain Bertaina
Email and address: email@example.com
Subject’s title: Skyrmion to domain wall conversion and dynamics in magnetic nanowires
A magnetic domain wall in a nanowire is a boundary between opposing magnetized regions. The systematic displacement of domain walls by spin-polarized currents is at the foundation of emergent and promising technologies for high-density data storage and magnetic logic devices. The racetrack memory is a solid-state device, potentially three dimensional, which allows high-speed writing and reading of non-volatile data. Different configurations of the racetrack memory were proposed, based on the displacement of domain walls in nanowires with specific properties (like high perpendicular anisotropy, spin-orbit effects or antiferromagnetic coupling).
A magnetic skyrmion is a localized stable topological spin texture, that appears in systems with broken inversion symmetry or interfacial asymmetric multilayers due to the Dzyaloshinskii-Moryia interaction (DMI). The skyrmions can be displaced along a nanotrack by spin-polarized currents or spin-orbit torques. The conversion of a pair of domain walls or of a chiral band domain into a magnetic skyrmion has already been proposed and verified experimentally.
The scientific project proposes the study of domain walls and skyrmion displacement and their mutual conversion in a multisegmented nanowire. In particular, the high-frequency dynamics of domain walls and skyrmions is envisaged and the influence of the different torques (spin-transfer, spin-orbit or magnonic spin-transfer) on their displacement as well as on their mutual conversion. The proposed system constitute a hybrid magnetic memory where the information is written/read in the domain walls, but displaced at high velocities through skyrmions conversion.
The potential candidate must have a solid background in condensed matter physics. His/her activities will cover the development of analytical models, as well as numerical simulations of the systems analyzed. Knowledge directly related to the project (nanomagnetism, spintronics, spin dynamics) will be appreciated.
Funding: Graduate school
Keywords: Nanomagnetism, spintronics, skyrmions, domain wallsContinue reading
|Title||PhD - Skyrmion to domain wall conversion and dynamics in magnetic nanowires|
|Employer||Institut Matériaux Microélectronique Nanosciences de Provence (IM2NP)|
|Job location||Faculté des Sciences de Saint Jérôme - Case 142, Avenue Escadrille Normandie Niemen, F-13397 Marseille Cedex 20, 13397 Marseille|
|Published||February 14, 2020|
|Job types||PhD  |
|Fields||Electromagnetism,   Nanotechnology,   Condensed Matter Physics,   Solid-state Physics  |