TY - JOUR
T1 - Nanocontact vortex oscillators based on Co2MnGe pseudo spin valves
AU - Létang, Jérémy
AU - Melo, Claudia de
AU - Guillemard, Charles
AU - Vecchiola, Aymeric
AU - Rontani, Damien
AU - Petit-Watelot, Sébastien
AU - Yoo, Myoung-Woo
AU - Devolder, Thibaut
AU - Bouzehouane, Karim
AU - Cros, Vincent
AU - Andrieu, Stéphane
AU - Kim, Joo-Von
PY - 2021/6/21
Y1 - 2021/6/21
N2 - We present an experimental study of vortex dynamics in magnetic nanocontacts based on pseudo spin valves comprising the Co2MnGe Heusler compound. The films were grown by molecular beam epitaxy, where precise stoichiometry control and tailored stacking order allowed us to define the bottom ferromagnetic layer as the reference layer, with minimal coupling between the free and reference layers. 20-nm diameter nanocontacts were fabricated using a nanoindentation technique, leading to self-sustained gyration of the vortex generated by spintransfer torques above a certain current threshold. By combining frequency- and time-domain measurements, we show that different types of spin-transfer induced dynamics related to different modes associated to the magnetic vortex configuration can be observed, such as mode hopping, mode coexistence, and mode extinction appearing in addition to the usual gyration mode.
AB - We present an experimental study of vortex dynamics in magnetic nanocontacts based on pseudo spin valves comprising the Co2MnGe Heusler compound. The films were grown by molecular beam epitaxy, where precise stoichiometry control and tailored stacking order allowed us to define the bottom ferromagnetic layer as the reference layer, with minimal coupling between the free and reference layers. 20-nm diameter nanocontacts were fabricated using a nanoindentation technique, leading to self-sustained gyration of the vortex generated by spintransfer torques above a certain current threshold. By combining frequency- and time-domain measurements, we show that different types of spin-transfer induced dynamics related to different modes associated to the magnetic vortex configuration can be observed, such as mode hopping, mode coexistence, and mode extinction appearing in addition to the usual gyration mode.
UR - https://doi.org/10.1103/PhysRevB.103.224424
U2 - 10.1103/PhysRevB.103.224424
DO - 10.1103/PhysRevB.103.224424
M3 - Article
VL - 103
JO - Physical Review B
JF - Physical Review B
IS - 224424
ER -