A microtube implosion driven by ultraintense laser pulses is used to produce ultrahigh magnetic fields. Due to the laser-produced hot electrons with energies of mega-electron volts, cold ions in the inner wall surface implode towards the central axis. By pre-seeding uniform magnetic fields on the kilotesla order, the Lorenz force induces the Larmor gyromotion of the imploding ions and electrons. Due to the resultant collective motion of relativistic charged particles around the central axis, strong spin current densities of [Formula: see text] peta-ampere/[Formula: see text] are produced with a few tens of nm size, generating megatesla-order magnetic fields. The underlying physics and important scaling are revealed by particle simulations and a simple analytical model. The concept holds promise to open new frontiers in many branches of fundamental physics and applications in terms of ultrahigh magnetic fields.

ETSI Aeronáutica y del Espacio Universidad Politécnica de Madrid Madrid Spain

Institute of Laser Engineering Osaka University Suita Osaka 565 0871 Japan

Institute of Physics of the ASCR ELI Beamlines Na Slovance 2 18221 Prague Czech Republic

Kansai Photon Science Institute National Institutes for Quantum and Radiological Science and Technology Kizugawa Kyoto 619 0215 Japan

University of California San Diego 9500 Gilman Drive La Jolla CA 92093 0411 USA

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Generation of intense magnetic wakes by relativistic laser pulses in plasma