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A scheme to generate magnetized relativistic plasmas in laboratory isproposed. It is based on interaction of ultra-high-intensity sub-picosecondlaser pulses with few-micron thick foils or films. By means of Particle-In-Cellsimulations it is shown that energetic electrons produced by the laser andevacuated at the rear of the target trigger an expansion of the target andbuilds up a strong azimuthal magnetic field. It is shown that in the expandingplasma sheath a ratio of the magnetic pressure and the electron rest-massenergy density exceeds unity whereas a the plasma pressure is lower than themagnetic pressure and the electron gyroradius is lower than the plasmadimension. This scheme can be utilised to study astrophysical extreme phenomenasuch as relativistic magnetic reconnection in laboratory.

Generation of cold magnetized relativistic plasmas at the rear of thin foils irradiated by ultra-high-intensity laser pulses