Yuying Liu, Jiaqi Su, Minghang Li, Binye Liang, Botao Jiang, Xinzhe Hu, Yunzhong Chen, Zian Li
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Nanoprecipitate-mediated magnetic domain wall pinning and enhanced magnetocrystalline anisotropy via trace holmium doping in Fe3Ga alloys
This study investigates the influence of trace holmium (Ho) doping on the microstructural and magnetic properties of (Fe0.75Ga0.25)99.7Ho0.3 alloys through advanced transmission electron microscopy (TEM) techniques, with a particular emphasis on directly correlating microstructure-magnetism. Lorentz TEM and off-axis electron holography (OAEH) analyses demonstrate that Ho incorporation induces the formation of nanoprecipitates, which facilitate grain refinement and serve as effective domain-wall pinning centers, thereby significantly restricting domain wall mobility. These microstructural modifications result in a slow magnetic response at low applied fields and enhanced magnetocrystalline anisotropy, as corroborated by quantitative assessments of domain wall width derived from holographic data. Our findings demonstrate that trace rare-earth doping serves as an effective strategy for engineering microstructures and tailoring magnetocrystalline anisotropy for optimized magnetic properties of Fe3Ga alloys. Concurrently, we demonstrate the capability of advanced TEM-based magnetic imaging to resolve nanoscale magnetic behavior, including real-time domain wall motion and spatially resolved anisotropy energy quantification.
期刊介绍:
The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.