Stability of Spinmotive Force in Perpendicularly Magnetized Nanowires under High Magnetic Fields

TL;DR

This study demonstrates that nanowires with high magnetic anisotropy can produce stable spinmotive forces under strong magnetic fields, with potential for downsized spintronic devices.

Contribution

It reveals the high stability of spinmotive force in perpendicularly magnetized nanowires with large anisotropy under strong magnetic fields, supported by numerical simulations.

Findings

Spinmotive force reaches tens to hundreds of microvolts in multilayered Co/Ni and FePt nanowires.

FePt nanowires generate two orders of magnitude larger spinmotive force than permalloy nanowires.

High anisotropy nanowires enable downsizing of spinmotive force devices.

Abstract

Spinmotive force induced by domain wall motion in perpendicularly magnetized nanowires is numerically demonstrated. We show that using nanowires with large magnetic anisotropy can lead to a high stability of spinmotive force under strong magnetic fields. We observe spinmotive force in the order of tens of microvolt in a multilayered Co/Ni nanowire and in the order of several hundred microvolt in a FePt nanowire; the latter is two orders of magnitude greater than that in permalloy nanowires reported previously. The narrow structure and low mobility of a domain wall under magnetic fields in perpendicularly magnetized nanowires permits downsizing of spinmotive force devices.