Veranstaltungen

13. Mai 2025, 16:00 bis 17:00

Manfred Albrecht, Institute of Physics, University of Augsburg/Germany

Seminar

Ferrimagnets: From THz emitters to skyrmions

A new type of spintronic THz emitter has been discovered not too long ago, which is based on the inverse spin Hall effect. These “spintronic” THz emitters typically consist of ferromagnetic/ nonmagnetic metal bilayers. We have shown that bilayers consisting of a ferrimagnetic (FI) Tb(Gd)-Fe alloys can be utilized as well as efficient spintronic THz emitters.

FI multilayers can also be used to host various magnetic spin textures including magnetic skyrmions, which are promising candidates for future spintronic devices. In this regard, we have shown the possibility to stabilize skyrmions and antiskyrmions in FI Gd/Fe based multilayers. With micromagnetic simulations, we concluded that the reduction of saturation magnetization and uniaxial magnetic anisotropy leads to the existence of a zoo of different spin objects and that they are primarily stabilized by dipolar interactions. Together with colleagues from Göttingen, we also investigated the spin dynamics and laser-induced control of spin objects.

In a further study, we have recently observed high order skyrmions and antiskyrmions of arbitrary topological charge at room temperature in a ferromagnetic Co/Ni multilayer system. This system exhibits a high number of vertical Bloch lines, which are essential to the formation of these novel higher-order skyrmions and antiskyrmions if exposed to an out-of- plane magnetic field. The observed coexistence of different topological protected spin objects provides great potential for further studies on quasi-particle interactions, spin dynamics as well as for possible future applications.

Kalendereintrag

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