Ultrafast spin exchange-coupling torque via photo-excited charge-transfer processes

Ma, X.; Fang, F.; Li, Q.; Zhu, J.; Yang, Y.; Wu, Y. Z.; Zhao, H. B.; Lüpke, G.

doi:10.1038/ncomms9800

Title: Ultrafast spin exchange-coupling torque via photo-excited charge-transfer processes

Journal Article · Wed Oct 28 00:00:00 EDT 2015 · Nature Communications

DOI:https://doi.org/10.1038/ncomms9800· OSTI ID:1239320

Ma, X. ^[1]; Fang, F. ^[1]; Li, Q. ^[2]; Zhu, J. ^[2]; Yang, Y. ^[2]; Wu, Y. Z. ^[2]; Zhao, H. B. ^[2]; Lüpke, G. ^[1]

College of William and Mary, Williamsburg, VA (United States)
Fudan Univ., Shanghai (China)

In this study, optical control of spin is of central importance in the research of ultrafast spintronic devices utilizing spin dynamics at short time scales. Recently developed optical approaches such as ultrafast demagnetization, spin-transfer and spin-orbit torques open new pathways to manipulate spin through its interaction with photon, orbit, charge or phonon. However, these processes are limited by either the long thermal recovery time or the low-temperature requirement. Here we experimentally demonstrate ultrafast coherent spin precession via optical charge-transfer processes in the exchange-coupled Fe/CoO system at room temperature. The efficiency of spin precession excitation is significantly higher and the recovery time of the exchange-coupling torque is much shorter than for the demagnetization procedure, which is desirable for fast switching. The exchange coupling is a key issue in spin valves and tunnelling junctions, and hence our findings will help promote the development of exchange-coupled device concepts for ultrafast coherent spin manipulation.

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Research Organization:: College of William and Mary, Williamsburg, VA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-04ER46127

OSTI ID:: 1239320

Journal Information:: Nature Communications, Vol. 6; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 32 works

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Antiferromagnetic opto-spintronics Němec, P.; Fiebig, M.; Kampfrath, T. Nature Physics, Vol. 14, Issue 3 https://doi.org/10.1038/s41567-018-0051-x	journal	March 2018
Magneto-optical probe of ultrafast spin dynamics in antiferromagnetic CoO thin films Zheng, Z.; Shi, J. Y.; Li, Q. Physical Review B, Vol. 98, Issue 13 https://doi.org/10.1103/physrevb.98.134409	journal	October 2018
Dynamics of Magnetization in Multilayer TbCo / FeCo Structures under the Influence of Femtosecond Optical Excitation Ilyin, N. A.; Klimov, A. A.; Tiercelin, N. Russian Technological Journal, Vol. 7, Issue 3 https://doi.org/10.32362/2500-316x-2019-7-3-50-58	journal	June 2019
Antiferromagnetic opto-spintronics Němec, P.; Fiebig, M.; Kampfrath, Tobias Freie Universität Berlin https://doi.org/10.17169/refubium-4221	text	January 2018
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Femtosecond visualization of oxygen vacancies in metal oxides Zhang, Xinping; Tang, Fawei; Wang, Meng Science Advances, Vol. 6, Issue 10 https://doi.org/10.1126/sciadv.aax9427	journal	March 2020

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