# Magnetic field generation from a coil-shaped foil by a laser-triggered hot-electron current

## TL;DR

This paper demonstrates that a femtosecond relativistically intense laser pulse can generate a strong, controllable magnetic field in a coil-shaped foil target through hot-electron currents, with potential applications in laser-based magnetization.

## Contribution

It introduces a novel scheme for magnetic field generation using laser-triggered hot-electron currents in coil-shaped foils, with detailed simulation analysis of control parameters.

## Key findings

- Magnetic fields with high strength and long lifetime are generated.
- Target and pulse parameters can control the magnetic field's strength and duration.
- The process is significant for advancing laser-based magnetization technologies.

## Abstract

A strong electron current triggered by a femtosecond relativistically intense laser pulse in a foil coil-like target is shown to be able to generate a solenoidal-type extremely strong magnetic field. The magnetic field lifetime sufficiently exceeds the laser pulse duration and is defined mainly by the target properties. The process of the magnetic field generation was studied with 3D PIC simulations. It is demonstrated that the pulse and the target parameters allow controlling the field strength and duration. The scheme studied is of great importance for laser-based magnetization technologies.