Veranstaltungen

11. Dezember 2025, 11:00 bis 12:00

Jon Gorchon, Université de Lorraine, CNRS, IJL, Nancy, F-54000, France

Seminar

Optical detection of out-of-equilibrium spin accumulations in multilayers

Magneto-optical techniques are powerful tools for investigating ultrafast spin dynamics in magnetic materials [1,2] and are increasingly used to study spin and orbital angular momentum accumulation in magnetic/non-magnetic systems [3]. It was long believed that accumulation signals were much weaker than those from magnetization dynamics. Recently, we showed that under certain conditions these signals can match or even exceed magnetization signals during ultrafast demagnetization [4], and we demonstrated how to isolate them experimentally.

I will present experiments where we separate magnetization dynamics from spin accumulation. Accessing ultrafast spin accumulations enables identification of femtosecond laser–induced magnetization reversal mechanisms in multilayer stacks [5] and offers new means to probe angular momentum exchanges and transport properties. Moreover, these long propagating spin currents offer new ways to access buried magnetic information. This will be exploited to build a novel type of magneto-optical microscope.

[1] E. Beaurepaire et al., Physical Review Letters, 76, 4250 (1996)
[2] G. Malinowski et al., Nature Physics, 4, 855-858 (2008)
[3] Y.G. Choi et al., Nature, 619, 52-56 (2023)
[4] A. Anadón et al., Physical Review B, 112 (10), pp.104437 (2025)

Kalendereintrag

Veranstaltung Details

Veranstaltungsort
SEM.R. DB gelb 05 B
1040 Wien
Wiedner Hauptstraße 8-10/E134
Veranstalter
IAP
Manuela Marik
marik@iap.tuwien.ac.at
Öffentlich
Ja
Kostenpflichtig
Nein
Anmeldung erforderlich
Nein