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MA: Fachverband Magnetismus

MA 11: Magnetic Materials

MA 11.15: Talk

Monday, March 23, 2009, 19:00–19:15, HSZ 103

Thermal stability and magnetic properties of Fe-Co-B-Si-Nb glassy alloys — •Mihai Stoica¹, Ran Li¹, and Jürgen Eckert^1,2 — ¹IFW Dresden, Institute for Complex Materials, P.O. Box 270116, D-01171 Dresden, Germany — ²TU Dresden, Institute of Materials Science, D-01062 Dresden, Germany

The fully glassy rods of [(Fe_xCo_1−x)_0.75Si_0.05B_0.25]₉₄Nb₆ alloys (x = 0.4, 0.5 and 0.6) in diameters up to 2 mm were produced by copper mold casting. The effect of Fe substitution in these glassy alloys on thermal stability and melting behavior were studied by differential scanning calorimetry. Phase evolution of the glassy alloys during heating crystallization process was evaluated using X-rays diffraction. The first crystallization stage results in the precipitation of metastable (Fe,Co)₂₃B₆ crystalline phase in the glassy alloys. The behaviour of the glassy alloys in DC applied field was investigated by means of vibrating sample magnetometer. The investigated samples are soft magnetic. Further, the influence of crystallization on the saturation magnetization (M_s), coercivity (H_c) and Curie temperature (T_c) were evaluated, which indicated that (Fe,Co)₂₃B₆ phase can improve the M_s and T_c, while also increase the H_c.