Ultrashort spin–orbit torque generated by femtosecond laser pulses

0566596 - FZÚ 2023 RIV DE eng J - Článek v odborném periodiku
Janda, T. - Ostatnický, T. - Němec, P. - Schmoranzerová, E. - Campion, R. - Hills, V. - Novák, Vít - Šobáň, Zbyněk - Wunderlich, Joerg
Ultrashort spin–orbit torque generated by femtosecond laser pulses.
Scientific Reports. Roč. 12, č. 1 (2022), č. článku 21550. ISSN 2045-2322. E-ISSN 2045-2322
Grant CEP: GA ČR(CZ) GX19-28375X
GRANT EU: European Commission(XE) 766566 - ASPIN
Grant ostatní: European Cooperation in Science and Technology(XE) COST Action CA17123
Výzkumná infrastruktura: CzechNanoLab - 90110
Institucionální podpora: RVO:68378271
Klíčová slova: spintronics * ultra-high frequency electronic device * spin–orbit interaction * p-i-n photodiode
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 4.6, rok: 2022
Způsob publikování: Open access

To realize the very objective of spintronics, namely the development of ultra-high frequency and energy-efficient electronic devices, an ultrafast and scalable approach to switch magnetic bits is required. Magnetization switching with spin currents generated by the spin–orbit interaction at ferromagnetic/non-magnetic interfaces is one of such scalable approaches, where the ultimate switching speed is limited by the Larmor precession frequency. Understanding the magnetization precession dynamics induced by spin–orbit torques (SOTs) is therefore of great importance. Here we demonstrate generation of ultrashort SOT pulses that excite Larmor precession at an epitaxial Fe/GaAs interface by converting femtosecond laser pulses into high-amplitude current pulses in an electrically biased p-i-n photodiode. We control the polarity, amplitude, and duration of the current pulses and, most importantly, also their propagation direction with respect to the crystal orientation.
Trvalý link: https://hdl.handle.net/11104/0337934