Effect of Notch Structure on Magnetic Domain Movement in Planar Nanowires

TL;DR

This study investigates how notch structures in permalloy nanowires influence magnetic domain movement, demonstrating control over coercive fields and domain nucleation, with implications for spintronic device design.

Contribution

It provides direct experimental observation and analysis of how notch size, shape, and angle affect magnetic domain dynamics in nanowires, supported by simulations.

Findings

Notch size and shape modulate domain wall motion.

Coercive fields can be tuned via notch design.

Notch angle influences domain nucleation.

Abstract

We present the direct observation of magnetic domain motion in permalloy nanowires with notches using a wide-field Kerr microscopy technique. The domain wall motion can be modulated by the size and shape of the notch structure in the nanowires. It is demonstrated that the coercive fields can be tuned by modulating the notches. The experimental results are consistent with the micro-magnetic simulation results. The relationship between the notch angle and the domain nuclease are also studied. This work is useful for the design and development of the notch-based spintronic devices.