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Indirect optical manipulation of the antiferromagnetic order of insulating NiO by ultrafast interfacial energy transfer

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arxiv 2205.02686 v1 pith:7VPHO6EW submitted 2022-05-05 cond-mat.mtrl-sci

Stephan Wust , Christopher Seibel , Hendrik Meer , Paul Herrgen , Christin Schmitt , Lorenzo Baldrati , Rafael Ramos , Takashi Kikkawa
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Eiji Saitoh Olena Gomonay Jairo Sinova Yuriy Mokrousov Hans Christian Schneider Mathias Kläui Baerbel Rethfeld Benjamin Stadtmüller Martin Aeschlimann
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classification cond-mat.mtrl-sci
keywords ultrafastantiferromagneticenergyordertransferinsulatingopticalreduction
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We report the ultrafast, (sub)picosecond reduction of the antiferromagnetic order of the insulating NiO thin film in a Pt/NiO bilayer. This reduction of the antiferromagnetic order is not present in pure NiO thin films after a strong optical excitation. This ultrafast phenomenon is attributed to an ultrafast and highly efficient energy transfer from the optically excited electron system of the Pt layer into the NiO spin system. We propose that this energy transfer is mediated by a stochastic exchange scattering of hot Pt electrons at the Pt/NiO interface.

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  1. Separating terahertz spin and charge contributions from ultrathin antiferromagnetic heterostructures

    cond-mat.mes-hall 2024-12 conditional novelty 7.0 of 10

    THz emission from Pt/NiO consists of non-magnetic difference-frequency generation and magnetic emission from ultrafast demagnetization of field-canted NiO spins, with no spin transport or coherent magnons observed.

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