TY - JOUR

T1 - Short nanometer range optically induced magnetic fluctuations accompanying ultrafast demagnetization of nanoscale ferromagnetic domains

AU - Suturin, Sergey m.

AU - Philippi-Kobs, Andre

AU - Carley, Robert

AU - Gort, Rafael

AU - Grübel, Gerhard

AU - Jal, Emmanuelle

AU - Baidakova, Marina v.

AU - Lobanova, Eugeniya yu.

AU - Mercadier, Laurent

AU - Molodtsov, Serguei l.

AU - Müller, Leonard

AU - Potorochin, Dmitrii v.

AU - Riepp, Matthias

AU - Roseker, Wojciech

AU - Scherz, Andreas

AU - Schlappa, Justine

AU - Le guyader, Loïc

AU - Mercurio, Giuseppe

AU - Turcato, Monica

AU - Van kuiken, Benjamin

AU - Yaroslavtsev, Alexander

AU - Deviatov, Alexander y.

AU - Kvashnin, Yaroslav o.

AU - Lichtenstein, Alexander i.

AU - Mazurenko, Vladimir v.

AU - Pronin, Igor i.

N1 - The XFEL experiment has been carried out along proposal 2313. We acknowledge financial support from the VEKMAG end-station by the German Federal Ministry for Education and Research (BMBF 05K10PC2, 05K10WR1, 05K10KE1) and by HZB. We acknowledge funding from the following institutions: the Ministry of Science and Higher Education of the Russian Federation (Agreement No. 075-15-2021-1349) (S.M.S., M.V.B.), the Swedish Research Council (V.R.) Project No. 2019–03569 (Y.O.K.), the Russian Science Foundation, Grant No. 21-72-10136 (A.Y.D., V.V.M.), and CNRS-MOMENTUM (E.J.).

PY - 2023

Y1 - 2023

N2 - We have studied the nature of optically induced short-range magnetic fluctuations occurring at 10-nm length scale during ultrafast demagnetization in ferromagnetic Co/Pt multilayers. The time resolved probing of magnetization dynamics was performed with femtosecond soft x-ray pulses at the European x-ray free-electron laser. A transient high-q magnetic scattering accompanying and directly correlated to the destruction of the maze domain network has been observed at picosecond time scale in the wave vector region of 0.2-0.8nm-1. This high-q scattering has a purely magnetic nature and is ascribed to the optically induced short-range magnetic fluctuations developing in the disturbed but not fully destroyed magnetic domain network. Finally, we have simulated the optically induced response of the domain system using a two-temperature atomistic spin model and have concluded that the reason behind the high-q scattering is the laser-driven heating inducing thermal fluctuations of the domain magnetic structure.

AB - We have studied the nature of optically induced short-range magnetic fluctuations occurring at 10-nm length scale during ultrafast demagnetization in ferromagnetic Co/Pt multilayers. The time resolved probing of magnetization dynamics was performed with femtosecond soft x-ray pulses at the European x-ray free-electron laser. A transient high-q magnetic scattering accompanying and directly correlated to the destruction of the maze domain network has been observed at picosecond time scale in the wave vector region of 0.2-0.8nm-1. This high-q scattering has a purely magnetic nature and is ascribed to the optically induced short-range magnetic fluctuations developing in the disturbed but not fully destroyed magnetic domain network. Finally, we have simulated the optically induced response of the domain system using a two-temperature atomistic spin model and have concluded that the reason behind the high-q scattering is the laser-driven heating inducing thermal fluctuations of the domain magnetic structure.

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U2 - 10.1103/PhysRevB.108.174444

DO - 10.1103/PhysRevB.108.174444

M3 - Article

VL - 108

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 17

M1 - 174444

ER -