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Room-temperature magnetization curves of magnetite (Fe3O4) nanoparticles (●) and magnetite-infused porous Si microparticles (○). The magnetic porous Si microparticles display superparamagnetic behavior similar to magnetite nanoparticles, although the porous Si microparticles exhibit lower saturation magnetization on a per-gram basis due to the presence of diamagnetic porous Si.
