The　structure　and　magnetic　properties　were　studied　for　the　ternary　Tb-Fe-B　nanoparticles　and　nanoflakes　prepared　by　surfactant-aid　high　energy　ball　milling　and　subsequent　size-selection.　For　the　nanoparticles,　significant　room-temperature　coercivity　up　to　10.6　kOe　was　achieved　with　the　average　particle　size　of　31.4　nm,　but　it　decreases　substantially　to　400　Oe　as　the　size　is　down　to　8.2　nm.　For　the　nanoflakes,　the　thickness　is　in　the　range　of　50-80　nm　while　the　length　is　about　1.1　mu　m,　and　high　coercivity　of　22.1　kOe　and　strong　magnetic　anisotropy　were　obtained　simultaneously,　indicating　that　the　nanoflakes　possess　excellent　permanent　magnetic　properties.　(C)　2011　American　Institute　of　Physics.　[doi:10.1063/1.3653256]