Terahertz spin currents and inverse spin Hall effect in thin-film heterostructures containing complex magnetic compounds

Terahertz emission spectroscopy (TES) of ultrathin multilayers of magnetic and heavy metals has recently attracted much interest. This method not only provides fundamental insights into photoinduced spin transport and spin–orbit interaction at highest frequencies, but has also paved the way for appl...

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Detalles Bibliográficos
Autores: Seifert, T., Martens, U., Günther, S., Schoen, M. A. W., Radu, F., Chen, X. Z., Lucas, Irene, Ramos, R., Aguirre, Myriam H., Algarabel, Pedro A., Anadón, Arturo, Körner, H. S., Walowski, J., Back, C., Ibarra, M. Ricardo, Morellón, Luis, Saitoh, E., Wolf, M., Song, Cunfeng, Uchida, K., Münzenberg, M., Radu, I., Kampfrath, T.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/182434
Acceso en línea:http://hdl.handle.net/10261/182434
Access Level:acceso abierto
Palabra clave:Terahertz spintronics
Femtomagnetism
Spin Hall effect
Spin Seebeck effect
Heterostructures
Descripción
Sumario:Terahertz emission spectroscopy (TES) of ultrathin multilayers of magnetic and heavy metals has recently attracted much interest. This method not only provides fundamental insights into photoinduced spin transport and spin–orbit interaction at highest frequencies, but has also paved the way for applications such as efficient and ultrabroadband emitters of terahertz (THz) electromagnetic radiation. So far, predominantly standard ferromagnetic materials have been exploited. Here, by introducing a suitable figure of merit, we systematically compare the strength of THz emission from X/Pt bilayers with X being a complex ferro-, ferri- and antiferromagnetic metal, that is, dysprosium cobalt (DyCo5), gadolinium iron (Gd24Fe76), magnetite (Fe3O4) and iron rhodium (FeRh). We find that the performance in terms of spin-current generation not only depends on the spin polarization of the magnet's conduction electrons, but also on the specific interface conditions, thereby suggesting TES to be a highly interface-sensitive technique. In general, our results are relevant for all applications that rely on the optical generation of ultrafast spin currents in spintronic metallic multilayers.

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