DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2024 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 35: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)

MA 35.1: Vortrag

Donnerstag, 21. März 2024, 09:30–09:45, H 2013

Fluctuation mediated spin-orbit torque enhancement in the noncollinear antiferromagnet Mn3Ni0.35Cu0.65NArnab Bose1, Aga Shahee1, Tom G. Saunderson1, •Adithya Rajan1, Dongwook Go2, Aurélien Manchon3, Yuriy Mokrousov1,2, and Mathias Kläui11Institut für Physik, Johannes-Gutenberg-Universität Mainz, 55099 Mainz, Germany — 2Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich, 52424 Jülich, Germany — 3CINaM, Aix-Marseille Université, CNRS, Marseille, France

Spin fluctuations near magnetic phase transitions play a pivotal role in generating exotic phenomena. This study focuses on experimental investigation of temperature-dependent spin torques in the noncollinear antiferromagnet Mn3Ni0.35Cu0.65N (MNCN). Our findings reveal a significant and nontrivial temperature dependence of spin-orbit torques (SOT), peaking near MNCN's Néel temperature. This behavior cannot be explained by conventional scattering mechanisms of the SHE. Notably, a maximum SOT efficiency of 30 % is measured, surpassing that of commonly studied nonmagnetic materials like Pt. Theoretical calculations support a negligible SHE and a pronounced orbital Hall effect, explaining the observed spin torques. We propose a novel mechanism where fluctuating antiferromagnetic moments induce substantial orbital currents near the Néel temperature. These results provide a promising avenue for enhancing spin torques, with potential applications in magnetic memory.

Keywords: noncollinear antiferromagnet; spin torque; Orbital current

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2024 > Berlin