Past Events
13. May 2025, 16:00 until 17:00
Manfred Albrecht, Institute of Physics, University of Augsburg/Germany
Seminar
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.
Event details
- Event location
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SEM.R. DB gelb 05 B
1040 Wien
Wiedner Hauptstraße 8-10/E134 - Organiser
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IAP
Manuela Marik
marik@iap.tuwien.ac.at - Public
- Yes
- Entrance fee
- No
- Registration required
- No