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The progress in x-ray free-electron lasers enables the direct and simultaneous observation of the femtosecond evolution of electron and spin systems through transient x-ray absorption spectroscopy and x-ray magnetic circular dichroism, respectively. Such experiments allow us to resolve the response seen in the population of the spin-split valence states upon optical excitation. Here, we utilize circularly polarized ultrashort soft x-ray pulses from the new helical afterburner undulator at the free-electron laser FLASH in Hamburg to study the femtosecond dynamics of a laser-excited CoPt alloy at the Co L3-edge absorption. Despite employing a weaker electronic excitation level, we find a comparable demagnetization for the Co 3d-states in CoPt compared to previous measurements on CoPd. This is attributed to the distinctly different spin\u2013orbit coupling between 3d and 4d vs 3d and 5d elements in the corresponding alloys and multilayers.<\/jats:p>","DOI":"10.1063\/4.0000297","type":"journal-article","created":{"date-parts":[[2025,4,25]],"date-time":"2025-04-25T14:22:53Z","timestamp":1745590973000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Femtosecond charge and spin dynamics in a Co50Pt50 alloy"],"prefix":"10.1063","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-8497-6605","authenticated-orcid":false,"given":"Martin","family":"Pavelka","sequence":"first","affiliation":[{"name":"Department of Physics and Astronomy, Uppsala University 1 , Box 516, 75120 Uppsala,","place":["Sweden"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1514-5264","authenticated-orcid":false,"given":"Simon","family":"Marotzke","sequence":"additional","affiliation":[{"name":"Deutsches Elektronen-Synchrotron DESY 2 , Notkestra\u00dfe 85, 22607 Hamburg,","place":["Germany"]},{"name":"Institut f\u00fcr Experimentelle und Angewandte Physik, Christian-Albrechts-Universit\u00e4t zu Kiel 3 , Olshausenstra\u00dfe 40, 24098 Kiel,","place":["Germany"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4495-9881","authenticated-orcid":false,"given":"Ru-Pan","family":"Wang","sequence":"additional","affiliation":[{"name":"Deutsches Elektronen-Synchrotron DESY 2 , Notkestra\u00dfe 85, 22607 Hamburg,","place":["Germany"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0470-5767","authenticated-orcid":false,"given":"Mohamed F.","family":"Elhanoty","sequence":"additional","affiliation":[{"name":"Department of Physics and Astronomy, Uppsala University 1 , Box 516, 75120 Uppsala,","place":["Sweden"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1755-876X","authenticated-orcid":false,"given":"G\u00fcnter","family":"Brenner","sequence":"additional","affiliation":[{"name":"Deutsches Elektronen-Synchrotron DESY 2 , Notkestra\u00dfe 85, 22607 Hamburg,","place":["Germany"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3659-7702","authenticated-orcid":false,"given":"Siarhei","family":"Dziarzhytski","sequence":"additional","affiliation":[{"name":"Deutsches Elektronen-Synchrotron DESY 2 , Notkestra\u00dfe 85, 22607 Hamburg,","place":["Germany"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8655-0545","authenticated-orcid":false,"given":"Somnath","family":"Jana","sequence":"additional","affiliation":[{"name":"Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy 4 , Max-Born Stra\u00dfe 2A, 12489 Berlin,","place":["Germany"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9255-9554","authenticated-orcid":false,"given":"W. 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