Inverse engineering and composite pulses for magnetization reversal

2017/03/10 by Ze-Guo Song, Song, Ze-Guo, Han‐Chun Wu +7
Engineering · Materials Science · #Electromagnetic Effects on Materials #Electromagnetic Launch and Propulsion Technology #FOS: Physical sciences #Magnetic Properties and Applications #Quantum Physics (quant-ph)

paper · pdf · doi:10.48550/arxiv.1703.03601

openalex publication_date 2017/03/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We put forward a method for achieving fast and robust for magnetization reversal in a nanomagnet, by combining the inverse engineering and composite pulses. The magnetic fields, generated by microwave with time-dependent frequency, are first designed inversely within short operation time, and composite pulses are further incorporated to improve the fidelity through reducing the effect of magnetic anisotropy. The high-fidelity magnetization reversals are illustrated with numerical examples, and visualized on Bloch sphere. The influence of damping parameters, relevant to the pulse sequence, is finally discussed based on Landau-Lifshitz-Gilber equation. These results pave the way for precise but fast magnetization reversal or switching, with the applications in high density information storage and processing.

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