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Ultrafast domain dilation induced by optical pumping in ferromagnetic CoFe/Ni multilayers



Dmitriy Zusin, Ezio E. Iacocca, Loic Le Guyader, Alexander H. Reid, William Schlotter, TianMin Liu, Daniel Higley, Giacomo Coslovich, Scott F. Wandel, Phoebe Tengdin, Sheena K. Patel, Anatoly Shabalin, Nelson Hua, Stjepan Hrkac, Hans Nembach, Justin Shaw, Sergio Montoya, Adam Blonsky, Christian Gentry, Mark Hoefer, Margaret M. Murnane, Henry C. Kapteyn, Eric E. Fullerton, Oleg Shpyrko, Hermann Durr, Thomas J. Silva


Ultrafast optical pumping of systems with spatially nonuniform magnetic textures is known to cause far-from-equilibrium spin transport effects, such as the broadening of domain-walls. Here, we study the dynamics of labyrinth domain networks in ferromagnetic CoFe/Ni multilayers subject to a femtosecond optical pump and find an ultrafast domain dilation by 6% within 1.6 ps. This surprising result is based on the unambiguous determination of a harmonically-related shift of ultrafast magnetic X-ray diffraction for the first- and third-order rings. Domain dilation is plausible from conservation of momentum arguments, whereby inelastic scattering from a hot, quasi-ballistic, radial current transfers momentum to the magnetic domains. Our results suggest a potentially rich variety of unexpected physical phenomena associated with far-from-equilibrium inelastic electron-magnon scattering processes in the presence of spin textures.
Nature Physics


ultrafast optical pumping, spatially nonuniform magnetic textures, far-from-equilibrium, spin transport effects, broadening of domain-walls, labyrinth domain networks, ferromagnetic CoFe/Ni multilayers, femtosecond optical pump, ultrafast domain dilation, magnetic X-ray diffraction, quasi-ballistic, inelastic electron-magnon scattering, spin textures


Zusin, D. , Iacocca, E. , Guyader, L. , Reid, A. , Schlotter, W. , Liu, T. , Higley, D. , Coslovich, G. , Wandel, S. , Tengdin, P. , Patel, S. , Shabalin, A. , Hua, N. , Hrkac, S. , Nembach, H. , Shaw, J. , Montoya, S. , Blonsky, A. , Gentry, C. , Hoefer, M. , Murnane, M. , Kapteyn, H. , Fullerton, E. , Shpyrko, O. , Durr, H. and Silva, T. (2020), Ultrafast domain dilation induced by optical pumping in ferromagnetic CoFe/Ni multilayers, Nature Physics, [online], (Accessed August 16, 2022)
Created February 12, 2020, Updated October 12, 2021