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Séminaire interne Spintec

Ultrafast magnetization reversal in ferromagnetic spin valves

Mercredi 11 janvier 2023 à 16:00, Salle de séminaire 445, bâtiment 1005, CEA-Grenoble

Publié le 11 janvier 2023
Junta Igarashi
Institut Jean Lamour, Université de Lorraine
The manipulation of magnetic materials without the use of magnetic fields is of great fundamental and technical interest. The discovery of spin-transfer torque (STT) [1,2] allowed us to control the magnetization direction electrically in magnetic devices within nanoseconds, which paved the way for non-volatile applications such as spin-transfer-torque magnetoresistive random access memory (STT-MRAM). However, current-induced STT switching below a few hundred picoseconds with low power consumption while maintaining high thermal stability is challenging. Ultra-short optical pulses can induce spin angular momentum transfer in a ferromagnetic spin valve, resulting in different demagnetization time depending on its magnetic configuration within less than a picosecond [3]. However, magnetization reversal in ferromagnetic spin valves by a single femtosecond laser pulse has not been achieved. In this seminar, I will show our recent work, where we demonstrated sub- picosecond magnetization reversal of a Co/Pt ferromagnetic layer induced by a single femtosecond laser pulse within a common [Co/Pt]/Cu/[Co/Pt] perpendicular spin-valve structure [4, 5]
References :
[1] J. C. Slonczewski, Journal of Magnetism and Magnetic Materials 159, L1‒L7 (1996).
[2] L. Berger, Phys. Rev. B 54, 9353‒9358 (1996).
[3] G. Malinowski et al ., Nature Phys., 4, 855-858 (2008).
[4] S. Mangin et al., Nature Mater 5, 210‒215 (2006)
[5] J. Igarashi et al., under review.

Plus d'information :https://www.spintec.fr/seminar-ultrafast-magnetization-reversal-in-ferromagnetic-spin-valve/

Pour suivre le seminaire en visioconférence : https://webconf.cea.fr/ioan-lucian.prejbeanu/C89D5FFJ?sl=1

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