Spinmotive Force due to Intrinsic Energy of Ferromagnetic Nanowires

TL;DR

This paper investigates how the intrinsic magnetic energy of domain walls in ferromagnetic nanowires can generate a measurable spinmotive force, converting magnetic energy into electrical energy.

Contribution

It provides analytical and numerical analysis of spinmotive force arising from the inherent energy of domain walls in wedged ferromagnetic nanowires, highlighting a new energy conversion mechanism.

Findings

Spinmotive force can reach several microvolts.

Domain wall motion is driven by effective magnetic fields due to energy gradients.

The mechanism converts magnetic energy into electrical energy via domain wall dynamics.

Abstract

We study, both analytically and numerically, a spinmotive force arising from inherent magnetic energy of a domain wall in a wedged ferromagnetic nanowire. In a spatially-nonuniform nanowire, domain walls are subjected to an effective magnetic field, resulting in spontaneous motion of the walls. The spinmotive force mechanism converts the ferromagnetic exchange and demagnetizing energy of the nanowire into the electrical energy of the conduction electrons through the domain wall motion. The calculations show that this spinmotive force can be several microvolts, which is easily detectable by experiments.