Speaker: Paul STEADMAN (Responsable de la ligne I10 au Synchroton Diamond)
Abstract : A study of the electric current induced hysteresis in Pt/CoFeTaB thin films revealed an unexpected behaviour in the hysteresis curves measured using polarised soft X-ray reflectivity [1]. Following a detailed study of the polarisation dependence of the reflected intensity [2] both detailed calculations and experimental data revealed that the switching is Y type (magnetisation switching perpendicular to the current), is very sensitive to external magnetic fields and that, rather bizarrely, only part of the film is switching. In addition the importance of non-linear dependence on the magnetic scattering and its dependence on polarisation and energy have been uncovered experimentally and explained with a very simple model.
- [1] D. M. Burn, R. Fan, O. Inyang, M. Tokac¸ L. Bouchenoire, A. T. Hindmarch and P. Steadman, P. (2022). Phys. Rev. B, 106, 094429.
- [2] Raymond Fan, Kiranjot, Razan O. M. Aboljadayel, Kalel Alsaeed, Peter, J. Synchrotron Rad. (2024). 31, 493–507
Kevin Dedecker (Institut Européen des Membranes (IEM); CNRS, ENSCM, Univ Montpellier)
Abstrasct
These works were carried out under the supervision of Mr. Carlo MASSOBRIO and Mr. Guido ORI at IPCMS in the DCMI department.
The defense will take place in English on Wednesday, December 13th, 2023 at 14:00 in the IPCMS auditorium.
This PhD work was performed at IPCMS and ICPEES under the supervision of Pr. Sylvie Bégin and co-supervision of Dr. Stéphane Le Calvé.
The defense will take place on Friday the 15th of December 2023 at 2:00 pm at the auditorium of IPCMS.
This work was carried out under the supervision of Dr. Pascal HEBRAUD at the Department of Ultrafast Optics and Nanophotonics (DON) of the IPCMS.
The defense will take place on Wednesday , June 28th 2023 at 14h00 in the IPCMS auditorium.
This work was performed under the supervision of Mr. Mathieu GALLART (IPCMS/DON)
The defense will take place on Tuesday, 03 October, 2023 at 2:00 pm at the IPCMS auditorium. The defense will be conducted in English.
The defense will take place on Friday the 20th of October at 9 a.m in the IPCMS auditorium.
This work was carried out under the supervision of Dr. Christophe Lefevre at DCMI.
Dr. Elena Levchenko (Université de Newcastle, Australie)
Contacts : Guillaume ROGEZ (rogez@unistra.fr)
Guido ORI (guido.ori@ipcms.unistra.fr)
