Spatially resolved ultrafast precessional magnetization reversal

TL;DR

This paper investigates spatially resolved ultrafast precessional magnetization reversal, revealing initial uniformity followed by dephasing and nonuniformity, impacting the reliability of magnetic switching devices.

Contribution

It introduces a method for spatially resolved measurement of precessional switching and analyzes the effects of dephasing on nonuniformity in magnetic reversal.

Findings

Dephasing leads to nonuniform magnetization after initial uniform response.

Novel suppression of end domains in remanence was achieved.

Results impact the design of reliable magnetic switching devices.

Abstract

Spatially resolved measurements of quasi-ballistic precessional magnetic switching in a microstructure are presented. Crossing current wires allow detailed study of the precessional switching induced by coincident longitudinal and transverse magnetic field pulses. Though the response is initially spatially uniform, dephasing occurs leading to nonuniformity and transient demagnetization. This nonuniformity comes in spite of a novel method for suppression of end domains in remanence. The results have implications for the reliability of ballistic precessional switching in magnetic devices.