Nanocontact vortex oscillators based on Co2MnGe pseudo spin valves

Jérémy Létang; Claudia de Melo; Charles Guillemard; Aymeric Vecchiola; Damien Rontani; Sébastien Petit-Watelot; Myoung-Woo Yoo; Thibaut Devolder; Karim Bouzehouane; Vincent Cros; Stéphane Andrieu; Joo-Von Kim

doi:10.1103/PhysRevB.103.224424

Nanocontact vortex oscillators based on Co2MnGe pseudo spin valves

Jérémy Létang, Claudia de Melo, Charles Guillemard, Aymeric Vecchiola, Damien Rontani, Sébastien Petit-Watelot, Myoung-Woo Yoo, Thibaut Devolder, Karim Bouzehouane, Vincent Cros, Stéphane Andrieu, Joo-Von Kim

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Journal	Physical Review B
Volume	103
Issue number	224424
DOIs	https://doi.org/10.1103/PhysRevB.103.224424
Publication status	Published - 21 Jun 2021
Externally published	Yes

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10.1103/PhysRevB.103.224424

https://arxiv.org/abs/2012.00522

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title = "Nanocontact vortex oscillators based on Co2MnGe pseudo spin valves",

abstract = "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.",

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doi = "10.1103/PhysRevB.103.224424",

language = "English",

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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 -

Nanocontact vortex oscillators based on Co2MnGe pseudo spin valves

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