Hard　magnetic　materials　based　on　SmCo5,　known　for　their　high　coercivity,　have　found　extensive　applications　in　advanced　technologies.　To　further　enhance　their　magnetic　performance,　it　is　advantageous　to　reduce　the　particle　size　slightly　below　the　single-domain　limit　and　modify　the　shape　to　a　one-dimensional　(1D)　structure.　Here,　two　strategies　were　introduced　with　the　aim　to　synthesize　the　anisotropic　SmCo5　nanostructured　magnetic　powder.　The　first　approach　involving　electrospinning　and　reduction-diffusion　failed　to　generate　the　desired　one-dimensional　structure,　resulting　in　zero-dimensional　(0D)　SmCo5　spherical　particles　with　a　coercivity　of　34.5　kOe　and　a　maximum　magnetic　energy　product　of　14　MGOe.　In　contrast,　the　second　approach,　which　combines　the　modified　polyol　process　with　reduction-diffusion,　yielded　a　SmCo5　magnetic　powder　with　two　distinct　morphologies:　zero-dimensional　spherical　particles　and　one-dimensional　nanofibers.　The　SmCo5　magnetic　powder　synthesized　by　the　second　method　exhibits　a　coercivity　of　47.2　kOe　and　a　maximum　magnetic　energy　product　of　17　MGOe,　significantly　exceeding　those　reported　for　zero-dimensional　spherical　SmCo5　nanoparticles.　This　high-performance　SmCo5　magnetic　powder　holds　considerable　promise　for　high-density　data　storage　and　permanent　magnet　applications.　Moreover,　it　provides　avenues　for　developing　exchange-coupled　nanocomposite　magnets　with　a　high　energy　density.　The　findings　of　this　study　may　serve　as　the　foundation　for　exploiting　anisotropic　SmCo5　nanomagnets　and　hold　significant　implications　for　the　design　of　advanced　magnetic　materials　using　the　reduction-diffusion　method.　©　2024　American　Chemical　Society