Direct device integration of single 1D nanoparticle assemblies; a magnetization reversal and magnetotransport study

• DOI: 10.1088/1361-6528/adc1d0
• Publication Date: 2025-03-18T22:47:57Z
• Authors: Mehran Sedrpooshan; Claudiu Bulbucan; Damon J Carrad; Thomas S Jespersen; Adam M Burke; Maria E Messing; Rasmus Westerström
• Keywords: Superparamagnetism; Single domain; Micromagnetics; Domain wall (magnetism)

Abstract Nanochains made up of a one-dimensional arrangement magnetic nanoparticles exhibit anisotropic properties with potential for various applications. Herein, using novel self-assembly method we directly integrate single nanochains onto desired substrates including devices. We present nanoscopic analysis magnetization reversal in 1D linear nanoparticle arrays by combining X-ray microscopy, magnetoresistance, and micromagnetic simulations. Imaging the local along individual scanning transmission microscopy circular dichroism under varying situ fields shows that each structure undergoes distinct non-homogeneous processes. The experimental observations are complemented simulations, revealing morphological inhomogeneities critically influence process where regions parallel chains or larger multi-domain particles act as nucleation centers switching smaller provide pinning sites domain propagation. Magnetotransport through reveals magnetoresistance behavior is correlated unique processes dictated morphology structures. This study provides new insights into complex mechanism inherent to particle assemblies effective parameters govern process.