Anatomy of Demagnetizing and Exchange Fields in Magnetic Nanodots Influenced by 3D Shape Modifications

TL;DR

This study investigates how 3D shape modifications in ferromagnetic nanodots influence the interplay of demagnetizing and exchange fields, using micromagnetic simulations to inform design for magneto-electronic applications.

Contribution

It provides new insights into the effects of nanoscale 3D shape changes on magnetic field interactions in ferromagnetic nanodots.

Findings

Different 3D modifications alter demagnetizing and exchange field competition.

Simulation results reveal mechanisms influencing hysteresis behavior.

Design guidelines for magnetic nanostructures are proposed.

Abstract

Hysteresis loops of 3D ferromagnetic permalloy nano-half-balls (dots) with 100 nm base diameter have been examined by means of LLG micromagnetic simulations and finite element methods. Tests were carried out with two orthogonal directions of the externally applied field at 10 kA/(m.ns) field sweeping speed. The comparison of samples with different 3D modifications at the sub-10nm scale, accessible by nowadays lithographic techniques, enables conclusions about different mechanisms of competition between demagnetizing and exchange fields. Design paradigms provided here can find possible applications in magneto-electronic devices.