Inertial spin dynamics in ferromagnets

Kumar Neeraj; Nilesh Awari; Sergey Kovalev; Debanjan Polley; Nanna Zhou Hagström; Sri Sai Phani Kanth Arekapudi; Anna Semisalova; Kilian Lenz; Bertram Green; Jan Christoph Deinert; Igor Ilyakov; Min Chen; Mohammed Bawatna; Valentino Scalera; Massimiliano d’Aquino; Claudio Serpico; Olav Hellwig; Jean Eric Wegrowe; Michael Gensch; Stefano Bonetti

doi:10.1038/s41567-020-01040-y

Inertial spin dynamics in ferromagnets

Kumar Neeraj
, Nilesh Awari
, Sergey Kovalev
, Debanjan Polley
, Nanna Zhou Hagström
, Sri Sai Phani Kanth Arekapudi
, Anna Semisalova
, Kilian Lenz
, Bertram Green
, Jan Christoph Deinert
, Igor Ilyakov
, Min Chen
, Mohammed Bawatna
, Valentino Scalera
, Massimiliano d’Aquino
, Claudio Serpico
, Olav Hellwig
, Jean Eric Wegrowe
, Michael Gensch
, Stefano Bonetti

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

Abstract

The understanding of how spins move and can be manipulated at pico- and femtosecond timescales has implications for ultrafast and energy-efficient data-processing and storage applications. However, the possibility of realizing commercial technologies based on ultrafast spin dynamics has been hampered by our limited knowledge of the physics behind processes on this timescale. Recently, it has been suggested that inertial effects should be considered in the full description of the spin dynamics at these ultrafast timescales, but a clear observation of such effects in ferromagnets is still lacking. Here, we report direct experimental evidence of intrinsic inertial spin dynamics in ferromagnetic thin films in the form of a nutation of the magnetization at a frequency of ~0.5 THz. This allows us to reveal that the angular momentum relaxation time in ferromagnets is on the order of 10 ps.

Original language	English
Pages (from-to)	245-250
Number of pages	6
Journal	Nature Physics
Volume	17
Issue number	2
DOIs	https://doi.org/10.1038/s41567-020-01040-y
Publication status	Published - 1 Feb 2021
Externally published	Yes

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Neeraj, K., Awari, N., Kovalev, S., Polley, D., Zhou Hagström, N., Arekapudi, S. S. P. K., Semisalova, A., Lenz, K., Green, B., Deinert, J. C., Ilyakov, I., Chen, M., Bawatna, M., Scalera, V., d’Aquino, M., Serpico, C., Hellwig, O., Wegrowe, J. E., Gensch, M., & Bonetti, S. (2021). Inertial spin dynamics in ferromagnets. Nature Physics, 17(2), 245-250. https://doi.org/10.1038/s41567-020-01040-y

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title = "Inertial spin dynamics in ferromagnets",

abstract = "The understanding of how spins move and can be manipulated at pico- and femtosecond timescales has implications for ultrafast and energy-efficient data-processing and storage applications. However, the possibility of realizing commercial technologies based on ultrafast spin dynamics has been hampered by our limited knowledge of the physics behind processes on this timescale. Recently, it has been suggested that inertial effects should be considered in the full description of the spin dynamics at these ultrafast timescales, but a clear observation of such effects in ferromagnets is still lacking. Here, we report direct experimental evidence of intrinsic inertial spin dynamics in ferromagnetic thin films in the form of a nutation of the magnetization at a frequency of \textasciitilde{}0.5 THz. This allows us to reveal that the angular momentum relaxation time in ferromagnets is on the order of 10 ps.",

author = "Kumar Neeraj and Nilesh Awari and Sergey Kovalev and Debanjan Polley and \{Zhou Hagstr{\"o}m\}, Nanna and Arekapudi, \{Sri Sai Phani Kanth\} and Anna Semisalova and Kilian Lenz and Bertram Green and Deinert, \{Jan Christoph\} and Igor Ilyakov and Min Chen and Mohammed Bawatna and Valentino Scalera and Massimiliano d{\textquoteright}Aquino and Claudio Serpico and Olav Hellwig and Wegrowe, \{Jean Eric\} and Michael Gensch and Stefano Bonetti",

note = "Publisher Copyright: {\textcopyright} 2020, The Author(s), under exclusive licence to Springer Nature Limited.",

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doi = "10.1038/s41567-020-01040-y",

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Neeraj, K, Awari, N, Kovalev, S, Polley, D, Zhou Hagström, N, Arekapudi, SSPK, Semisalova, A, Lenz, K, Green, B, Deinert, JC, Ilyakov, I, Chen, M, Bawatna, M, Scalera, V, d’Aquino, M, Serpico, C, Hellwig, O, Wegrowe, JE, Gensch, M & Bonetti, S 2021, 'Inertial spin dynamics in ferromagnets', Nature Physics, vol. 17, no. 2, pp. 245-250. https://doi.org/10.1038/s41567-020-01040-y

TY - JOUR

T1 - Inertial spin dynamics in ferromagnets

AU - Neeraj, Kumar

AU - Awari, Nilesh

AU - Kovalev, Sergey

AU - Polley, Debanjan

AU - Zhou Hagström, Nanna

AU - Arekapudi, Sri Sai Phani Kanth

AU - Semisalova, Anna

AU - Lenz, Kilian

AU - Green, Bertram

AU - Deinert, Jan Christoph

AU - Ilyakov, Igor

AU - Chen, Min

AU - Bawatna, Mohammed

AU - Scalera, Valentino

AU - d’Aquino, Massimiliano

AU - Serpico, Claudio

AU - Hellwig, Olav

AU - Wegrowe, Jean Eric

AU - Gensch, Michael

AU - Bonetti, Stefano

PY - 2021/2/1

Y1 - 2021/2/1

N2 - The understanding of how spins move and can be manipulated at pico- and femtosecond timescales has implications for ultrafast and energy-efficient data-processing and storage applications. However, the possibility of realizing commercial technologies based on ultrafast spin dynamics has been hampered by our limited knowledge of the physics behind processes on this timescale. Recently, it has been suggested that inertial effects should be considered in the full description of the spin dynamics at these ultrafast timescales, but a clear observation of such effects in ferromagnets is still lacking. Here, we report direct experimental evidence of intrinsic inertial spin dynamics in ferromagnetic thin films in the form of a nutation of the magnetization at a frequency of ~0.5 THz. This allows us to reveal that the angular momentum relaxation time in ferromagnets is on the order of 10 ps.

AB - The understanding of how spins move and can be manipulated at pico- and femtosecond timescales has implications for ultrafast and energy-efficient data-processing and storage applications. However, the possibility of realizing commercial technologies based on ultrafast spin dynamics has been hampered by our limited knowledge of the physics behind processes on this timescale. Recently, it has been suggested that inertial effects should be considered in the full description of the spin dynamics at these ultrafast timescales, but a clear observation of such effects in ferromagnets is still lacking. Here, we report direct experimental evidence of intrinsic inertial spin dynamics in ferromagnetic thin films in the form of a nutation of the magnetization at a frequency of ~0.5 THz. This allows us to reveal that the angular momentum relaxation time in ferromagnets is on the order of 10 ps.

U2 - 10.1038/s41567-020-01040-y

DO - 10.1038/s41567-020-01040-y

M3 - Article

AN - SCOPUS:85091606398

SN - 1745-2473

VL - 17

SP - 245

EP - 250

JO - Nature Physics

JF - Nature Physics

IS - 2

ER -

Inertial spin dynamics in ferromagnets

Abstract

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