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Nanocontact vortex oscillators based on Co2MnGe pseudo spin valves
- Source :
- Physical Review B, Physical Review B, American Physical Society, 2021, 103 (22), pp.224424. ⟨10.1103/PhysRevB.103.224424⟩
- Publication Year :
- 2021
- Publisher :
- American Physical Society (APS), 2021.
-
Abstract
- We present an experimental study of vortex dynamics in magnetic nanocontacts based on pseudo spin valves comprising the ${\mathrm{Co}}_{2}\mathrm{MnGe}$ 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 spin-transfer 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.
- Subjects :
- Materials science
FOS: Physical sciences
02 engineering and technology
engineering.material
01 natural sciences
Gyration
Condensed Matter::Materials Science
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
0103 physical sciences
[NLIN]Nonlinear Sciences [physics]
[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
010306 general physics
ComputingMilieux_MISCELLANEOUS
[PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall]
Spin-½
Condensed Matter - Mesoscale and Nanoscale Physics
Condensed matter physics
Order (ring theory)
Vorticity
021001 nanoscience & nanotechnology
Heusler compound
Vortex
Ferromagnetism
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
engineering
0210 nano-technology
Molecular beam epitaxy
Subjects
Details
- ISSN :
- 24699969 and 24699950
- Volume :
- 103
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi.dedup.....7e9f7050cb2a5b4eb0d68ad8891199e1