Influence of rare earth elements on crystallization of Fe82Nb2B14RE2 (RE=Y, Gd, Tb, and Dy) amorphous alloys

Optimization of Soft Magnetic Properties in Fe82Nb2B14RE2 (RE = Y, Gd, Tb and Dy) Group of Amorphous Alloys

“…1 show that for all examined alloys magnetic permeability can be enhanced by applying 1 h annealing at temperatures Figure 5 shows T op and the optimized magnetic permeability (determined for samples after annealing at T op ) versus magnetic moment m of RE additions. One can see that in relation to a non-magnetic Y addition the temperature T op slightly increases with increasing m. Similar effect was observed in [10] where it was shown that activation enthalpy of crystallization as well as crystallization heat depend on m in the same way. This means that high localized magnetic moment of RE atoms cause a slowing down of diffusion processes.…”

“…It was shown for example that 2 at.% of RE addition leads to an increase of the Curie temperature by no more than 34 K (for Fe 82 Nb 2 B 14 Gd 2 ) in relation to the reference Fe 82 Nb 2 B 14 Y 2 alloy (T C = 416 K) [9]. A strong spin-orbit coupling of Tb and Dy atoms leads to an additional magnetic anisotropy of the examined alloys and to a magnetic hardening (permeability drops down about 5 times and a finger-print domain structure appears) [10]. Moreover, a localized magnetic moment of RE atoms cause an increase of the activation enthalpy of crystallization by about 0.8 eV (4.4 …”

“…The type of the optimized microstructure strongly depends on alloying additions and parameters of the applied annealing. Influence of RE (rare earth) additions with a high localized magnetic moment on magnetic properties and crystallization of the same group of amorphous alloys in the asquenched state have been already reported in [9] and [10], respectively. It was shown for example that 2 at.% of RE addition leads to an increase of the Curie temperature by no more than 34 K (for Fe 82 Nb 2 B 14 Gd 2 ) in relation to the reference Fe 82 Nb 2 B 14 Y 2 alloy (T C = 416 K) [9].…”

Phase Composition and Magnetic Properties of Nanoperm Thin Films Doped with Yttrium

“…It was reported that in Nanoperm ribbons yttrium addition accelerates nucleation of crystal growth and causes a slowing down of diusion processes in relation to the Y free alloy and, consequently, aects their characteristics [3]. Moreover, changes in magnetic properties, microstructure and thermal stability caused by Y substitution of some Fe 81 Zr 7 B 5 Y 7 thin lms were also found [4].…”

Effects of Addition of Rare Earth on Magnetocaloric Effect in Fe82Nb2 B 14

“…Fe-Nb-B alloys are suggested to be applied in electronics as magnetic cores of discrete elements, sensors, or actuators. Moreover, low magnetic losses of such alloys are also of great importance in energy-saving technologies [20]. Therefore, investigations of new compositions or alloying additions can improve their different properties in contexts of possible applications.…”