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arXiv · 2407.14787

Terahertz antiferromagnetic dynamics induced by ultrafast spin currents

Sanjay René·Artem Levchuk·Amr Abdelsamie·Zixin Li·Pauline Dufour·Arthur Chaudron·Florian Godel·Jean-Baptiste Moussy·Karim Bouzehouane·Stéphane Fusil·Vincent Garcia·Michel Viret·Jean-Yves Chauleau
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Abstract

Insulating antiferromagnets are anticipated as the main protagonists of ultrafast spintronics, with their intrinsic terahertz dynamics and their abililty to transport spin information over long distances. However, direct transfer of spin angular momentum to an antiferromagnetic insulator at picosecond time scales remains to be demonstrated. Here, studying the ultrafast behaviour of ferromagnetic metal/antiferromagnetic insulator bilayers, we evidence the generation of coherent excitations in the antiferromagnet combined with a modulation of the demagnetization behavior of the ferromagnet. This confirms that magnetic information can indeed be propagated into antiferromagnetic spin waves at picosecond timescales, thereby opening an avenue towards ultrafast manipulation of magnetic information.

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Sanjay René, Artem Levchuk, Amr Abdelsamie, Zixin Li, Pauline Dufour, Arthur Chaudron, Florian Godel, Jean-Baptiste Moussy, Karim Bouzehouane, Stéphane Fusil, Vincent Garcia, Michel Viret, Jean-Yves Chauleau. 2024-07-20. Terahertz antiferromagnetic dynamics induced by ultrafast spin currents. https://arxiv.org/abs/2407.14787

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