Dr Sylvain Martin

Research Interests

• Spintronics

I have recently joined the Hitachi Cambridge Laboratory as a Research Scientist after my PhD at the Spintec laboratory. During my PhD I was working on static and dynamics transport measurements on spin electronic nano-devices. In particular, I am using a microwave to study the magnetic properties of a vortex oscillators based on ultra-low resistance magnetic tunnel junctions. By using synchronization and modulation phenomena, I was able to extract intrinsic such as the parametric behavior of the system, the tunability or the deviation sensitivity.

Recent Research projects

At present, I am working on anisotropic magneto-Seebeck effect in antiferromagnetic iridium manganese tunnel junctions. We think that changes in the density of states as a function of magnetisation direction - that give rise to a large tunnelling anisotropic magneto-resistance (TAMR) in these devices - might also have effects on the Seebeck coefficient. We followed the work of Walter et al. who have been working on a related effect in tunnelling magneto-resistance (TMR) devices - where the Seebeck coefficient depends on the relative orientation of two ferromagnetic leads - by laser heating of the top contact of a pillar structured device. This work is funded by the SpinIcur European project.

Last Publications

• D. Kriegner, H. Reichlova, J. Grenzer, W. Schmidt, E. Ressouche, J. Godinho, T. Wagner, S. Y. Martin, A. B. Shick, V. V. Volobuev, G. Springholz, V. Holy, J. Wunderlich, T. Jungwirth, and K. Vyborny, Phys. Rev. B 96, 21, 214418 (2017), Magnetic anisotropy in antiferromagnetic hexagonal MnTe

• S. Y. Martin, C. Thirion, C. Hoarau, C. Baraduc, and B. Dieny, J. Magn. Magn. Mater. 400, 374 (2016), Global analysis of frequency modulation experiments in a vortex oscillator

• P. Wadley, B. Howells, J. Zelezny, C. Andrews, V. Hills, R. P. Campion, V. Novak, K. Olejnik, F. Maccherozzi, S. S. Dhesi, S. Y. Martin, T. Wagner, J. Wunderlich, F. Freimuth, Y. Mokrousov, J. Kunes, J. S. Chauhan, M. J. Grzybowski, A. W. Rushforth, K. W. Edmonds, B. L. Gallagher, and T. Jungwirth, Science 351, 6273, 587 (2016), Electrical switching of an antiferromagnet