Dr Pierre Roy

Research Interests

• Spintronics

During my PhD I was working on magnetic properties in patterned soft magnetic structures, in particular magnetization dynamics at microwave frequencies in circular cylindrical and elliptic cylindrical dots but also static and quasi-static behaviors. During my post-docs I continued along similar lines of research mainly on stripe and ring geometries. I joined the Hitachi Cambridge Laboratory as a research scientist in April 2010.

Recent Research projects

• Current-induced domain wall motion (via spin-transfer-torque) in GaMnAs bar structures and ways to control it by manipulation of the magnetocrystalline anisotropy. This is controlled by stress-induced strains using piezo-electric actuators. Techniques used include Magneto-Optical Kerr Microscopy (to image the domain walls), various magnetotransport measurements (for the extraction of pertinent material parameters) and micromagnetic modeling (for gaining deeper insight into the phenomena)


• Domain wall resonance in stripe geometries including spin wave generation and manipulation


• Spin-Transfer-Torque in magnetic multilayers

Last Publications

• R. M. Otxoa, R. Rama-Eiroa, P. E. Roy, G. Tatara, O. Chubykalo-Fesenko, and U. Atxitia, Physical Review Research 3, 4, 043069 (2021), Topologically-mediated energy release by relativistic antiferromagnetic solitons

• P. E. Roy, J. Appl. Phys. 129, 19, 193902 (2021), Method to suppress antiferromagnetic skyrmion deformation in high speed racetrack devices

• P. E. Roy, IEEE Trans. Mag. 56, 12, 4300408 (2020), Controlled Localized Domain Wall Writing in Antiferromagnetic Nano Stripes With In-Plane Transverse Currents