Controlling All-Optical Helicity-Dependent Switching in Engineered Rare-Earth Free Synthetic Ferrimagnets.


Type
Article
Change log
Authors
Liao, Jung-Wei 
Vallobra, Pierre 
O'Brien, Liam 
Atxitia, Unai 
Raposo, Victor 
Abstract

All-optical helicity-dependent switching in ferromagnetic layers has revealed an unprecedented route to manipulate magnetic configurations by circularly polarized femtosecond laser pulses. In this work, rare-earth free synthetic ferrimagnetic heterostructures made from two antiferromagnetically exchange coupled ferromagnetic layers are studied. Experimental results, supported by numerical simulations, show that the designed structures enable all-optical switching which is controlled, not only by light helicity, but also by the relative Curie temperature of each ferromagnetic layer. Indeed, through the antiferromagnetic exchange coupling, the layer with the larger Curie temperature determines the final orientation of the other layer and so the synthetic ferrimagnet. For similar Curie temperatures, helicity-independent back switching is observed and the final magnetic configuration is solely determined by the initial magnetic state. This demonstration of electrically-detected, optical control of engineered rare-earth free heterostructures opens a novel route toward practical opto-spintronics.

Description
Keywords
all‐optical switching, ferromagnets, synthetic ferrimagnets
Journal Title
Adv Sci (Weinh)
Conference Name
Journal ISSN
2198-3844
2198-3844
Volume Title
6
Publisher
Wiley
Sponsorship
Engineering and Physical Sciences Research Council (EP/P005713/1)