We investigate both the ferromagnetic (FM) and antiferromagnetic (AFM) ultrafast dynamics of a strongly correlated oxide system, GdBaCo2O5.5 thin film, by time-resolved x-ray magnetic circular dichroism in reflectivity (XMCDR) and resonant magnetic x-ray diffraction (RMXD). A photo-induced AFM-FM transition characterized by an increase of the transient XMCDR beyond the unpumped value and a decay of RMXD was observed. The photon-energy dependence of the transient XMCDR and reflectivity can likely be interpreted as a concomitant photo-induced spinstate transition.
@article{arxiv.2105.10083,
title = {Photo-induced Antiferromagnetic-ferromagnetic Transition and Electronic Structure Modulation in GdBaCo$_2$O$_{5.5}$ Thin Film},
author = {Yujun Zhang and Tsukasa Katayama and Akira Chikamatsu and Christian Schüßler-Langeheine and Niko Pontius and Yasuyuki Hirata and Kou Takubo and Kohei Yamagami and Keisuke Ikeda and Kohei Yamamoto and Tetsuya Hasegawa and Hiroki Wadati},
journal= {arXiv preprint arXiv:2105.10083},
year = {2022}
}