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Magnetized high energy density physics offers new opportunities for observingmagnetic field-related physics for the first time in the laser-plasma context.We focus on one such phenomenon, which is the ability of a laser-irradiatedmagnetized plasma to amplify a seed magnetic field. We performed a series offully kinetic 3D simulations of magnetic field amplification by apicosecond-scale relativistic laser pulse of intensity $4.2\times 10^{18}$W/cm$^2$ incident on a thin foil. We observe axial magnetic field amplificationfrom an initial 0.1 kT seed to 1.5 kT over a volume of several cubic microns,persisting hundreds of femtoseconds longer than the laser pulse duration. Themagnetic field amplification is driven by electrons in the return currentgaining favorable orbital angular momentum from the seed magnetic field. Thismechanism is robust to laser polarization and delivers order-of-magnitudeamplification over a range of simulation parameters.

Magnetic field amplification in a laser-irradiated thin foil by return current electrons carrying orbital angular momentum