Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 30: Magnetic Materials II

MA 30.4: Talk

Wednesday, March 18, 2015, 15:45–16:00, H 0112

Structural and magnetic properties of Fe_11−xCo_xTiCe intermetallic compounds — •Dagmar Goll, Ralf Loeffler, Roland Stein, Ulrich Pflanz, Susanne Goeb, Roman Karimi, and Gerhard Schneider — Aalen University, Materials Research Institute (IMFAA), Aalen

Ce-based hard magnetic intermetallic compounds are currently undergoing a revival for potential low-cost permanent magnet applications due to the better abundance of Ce in the earth crust compared to Nd or Dy. One of these compounds is Fe₁₁MCe (M: Ti, Mo, V, Cr) with tetragonal Mn₁₂Th (12:1) structure and uniaxial anisotropy. The novel quaternary compound Fe_11−xCo_xTiCe with Co content x = 0 to 3.25 (0 at% to 25 at%) has been fabricated by arc melting. The samples have been analyzed concerning their crystallographic structure and intrinsic magnetic properties as function of temperature using x-ray diffraction, domain pattern analysis and magnetometry. With increasing Co content the lattice structure becomes contracted and the Curie temperature T_C continuously increases from 468 K (0 at% Co) to 725 K (25 at% Co). The maximum values of the anisotropy constant K₁ and saturation polarization J_s are observed for a Co content of 15 at%. For about x = 1.95 (about 15 at% Co) K₁ and J_s are 2.15 MJ/m³ and 1.27 T at room temperature and 1.22 MJ/m³ and 1.05 T at 200 ^∘C, respectively.