Fast minute magnetic field coil for time-resolved nanospintronics

TL;DR

This paper presents the design and fabrication of a fast, small magnetic field coil capable of delivering high-intensity pulses with rapid rise times, enabling advanced time-resolved nanospintronics experiments.

Contribution

It introduces a novel sub-millimeter coil design that provides fast, high-field pulses suitable for in-plane magnetic studies in nanospintronics.

Findings

Coil can generate magnetic fields up to ~500 Oe.

Rise time of the coil pulses is approximately 10 ns.

The coil enables measurement of magnetic domain wall velocities.

Abstract

Nanospintronic and related research often requires the application of fast rising magnetic field pulses in the plane of the studied planar structure. We have designed and fabricated sub-milimeter-sized coils capable of delivering pulses of the magnetic field up to ~ 500 Oe in the plane of the sample with the rise time of order of 10 ns. The placement of the sample above the coil allows for an easy access to its surface with manipulators or light beams for, e.g., Kerr microscopy. We use the fabricated coil to drive magnetic domain walls in 1 ${\mu}$ m wide permalloy wires and measure magnetic domain wall velocity as a function of the applied magnetic field.