Mr. Hongsong Qiu Profile

Hongsong Qiu

at Osaka Univ

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Proceedings Article | 9 November 2018 Paper

Terahertz emission and detection in magnetic materials

Hongsong Qiu, Kosaku Kato, Makoto Nakajima

Proceedings Volume 10826, 108260C (2018) https://doi.org/10.1117/12.2505840

KEYWORDS: Terahertz radiation, Heterojunctions, Platinum, Fermium, Frequency modulation, Interfaces, Magnetism, Ferromagnetics, Diffusion, Crystals

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The terahertz emissions from cobalt ferromagnetic heterostructures are demonstrated. The performances of heterostructures Fe/Au and Co/Pt have been compared. The amplitude of the terahertz emission sensitively depends on the non-magnetic materials. The terahertz emission is experimentally proved to be related to the spin currents by checking the terahertz emission using reversed magnetization and sample orientation. We further studied the Pt-layerthickness dependence of the amplitude of terahertz emission. A theoretical model is developed based on a comprehensive analysis of the spin transport. The efficiency of the spin injection from the ferromagnetic to nonmagnetic layer is evaluated by taking into account the interfacial spin loss. This work reveals that interfacial spin loss needs to be carefully addressed for the design of efficient terahertz emitter based on the ferromagnetic/nonmagnetic heterostructure.

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