Magnetic properties and structure change from tetragonal to hexagonal for the rapidly quenched SmTiFe11 alloy ribbons

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Abstract
Structure and magnetic properties of the rapidly quenched SmTiFe11 alloy ribbons fabricated under various quenching rates were systematically examined. Phase transformation from an equilibrium ThMn12‐type structure (tetragonal) to a metastable TbCu7‐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 TbCu7‐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, iHc=3 kOe, (BH)max=3 MGOe, were obtained for the ribbons with a ThMn12‐type structure.