Abstract
Two types of magnetite (Fe3O4) hollow nanostructures, namely, nanoring (NR) and nanotube (NT), were fabricated by chemical method. The NR and NT exhibit a vortex and ferromagnetic domain structure, respectively, as revealed by 3D micromagnetic simulation. The measurement on microwave electromagnetic properties suggests that the NT exhibits obviously higher permittivity than that of the NR. In comparison, their initial permeability is close to each other. In addition, a broad nature resonance peak of the NR and NT is observed at 3.5 and 4.5 GHz, respectively. The calculated microwave absorption property indicates that the NT composite exhibits a broad band effective absorption (<−10 dB), which is superior to the NR. It suggests that the NT could serve as a promising candidate for microwave absorption.
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