Year: 2022
Ultrafast domain-wall motion depends on symmetry
Measurements done at European XFEL showed that femtosecond optical pulses affect magnetic domains depending on their symmetry: labyrinth domains are mobile while stripe domains are virtually fixed. This observation was achieved by measuring samples with mixed states and developing a new analysis technique for 2D scattering data. This is our second editors’ suggestion on ultrafast magnetization dynamics published in Phys. Rev. B 106, 224424 (2022). Outstanding work from all the team and especially Nanna Zhou Hagström!
Casey, Victoria, and Ally present at MLRD
All three presented posters on their research at the Mountain Lion Research Day. Ally was also nominated as Grad Top Scholar! Well done!
Ghanem presents at MMM
Ghanem presented his work “Generalized auto-oscillator model for arbitrary spin ices” at MMM in Minneapolis. Outstanding work presenting to experts in the field!
Domains move at picosecond timescales
Our investigation of ultrafast domain-wall dynamics has been published in Phys. Rev. B and selected as editor’s suggestion. By a thorough analysis of scattering data taken at LCLS, we were able to find both domain-wall broadening and a shift in the scattering peak position that is indicative that domains move upon optical perturbation at picosecond timescales. More details in our publication D. Zusin et al., Ultrafast domain dilation induced by optical pumping in ferromagnetic CoFe/Ni multilayers, Phys. Rev. B 106, 144422 (2022).
MHz-rate ultrafast dynamics at EU-XFEL
First results from the MHz-repetition-rate X-ray scattering experiments from the Spectroscopy and Coherent Scattering instrument were achieved by a team of international researchers. This technique will enable accurate analysis of collected X-ray ultrafast scattering data. More details at N. Zhou Hagström et al., MHz-rate ultrafast X-ray scattering and holographic imaging at the European XFEL, J. Synchrotron Rad. 29 (2022).
FRAMS 2022
We all attended FRAMS 2022 at the University of Wyoming. As usual, good to catch up with the front range community and interact with so many good scientist in magnetism. Very well done Ally, Kyle, and Victoria with their poster presentations!
NSF funding for artificial spin ices
We are excited to announce that our project “Reconfigurable non-Hermitian and topological magnonics with interacting artificial spin ices” was awarded funding by NSF, EPMD as a standard grant. This research will deepen our understanding of topologically protected magnon modes in artificial spin ices as well as achieving substantial progress in their numerical modeling.
Ally and Kyle present at Magnonics 2022
Both Ally and Kyle presented their research progress in this international conference held in Oxnard, CA. Many interesting talks and posters. We also got to enjoy a boat trip and see dolphins!
EU-XFEL highlights our research
Our experiments were highlighted in EU-XFEL annual report 2021. Our research unambiguously demonstrates the impact of the long-range magnetic order on their ultrafast response, a key feature for any prospective application in data storage. The results of this collaborative effort are currently available on arXiv.
Ferromagnets exhibit memristance
When ferromagnets exhibit a topological texture, its dynamics may exhibit memristance when probed with a current. This effect is the dynamic analog to the anisotropic magnetoresistance (AMR) and was termed anisotropic magnetoMemristance (AMM). Fantastic collaboration with Francesco Caravelli and Cristiano Nisoli, Gia-Wei Chern, and Clodoaldo de Araujo. More details can be found in our open access publication npj Communications Physics 5, 166 (2022).