Structure and magnetic properties of the rapidly quenched SmTiFe 11 alloy ribbons fabricated under various quenching rates were systematically examined. Phase transformation from an equilibrium ThMn 12-type structure (tetragonal) to a metastable TbCu 7-type disordered structure (hexagonal) was found for the ribbons fabricated around the roll velocity, VR≅30 m/s. Magnetocrystalline anisotropy changed from uniaxial (Ku1=5. 0×107 erg/cm3) to in-plane anistropy in accordance with the structure change from ThMn12- to TbCu 7-type structure. Ms and Tc varied from 125 emu/g and 320°C (ThMn12 type) to 114 emu/g and 242°C (TbCu7 type), respectively. The maximum hard magnetic properties for SmTiFe11 alloy ribbons, iH c=3 kOe, (BH)max=3 MGOe, were obtained for the ribbons with a ThMn12-type structure.
ASJC Scopus subject areas
- Physics and Astronomy(all)