Magnetic Properties and Structure of Amorphous Fe74Hf4Ta1Cu1Gd1LaxSi15-xB4 (x = 0, 7) Ribbons

P.J. Bardzińskia, M. Kopcewicz b, M. Rybaczuk a, M. Hasiak a, A. Musiał c, V. Kinzhybalo d and B. Idzikowski c aWrocław University of Technology, Wrocław, Poland bInstitute of Electronic Materials Technology, Warsaw, Poland cInstitute of Molecular Physics, PAS, Poznań, Poland dInstitute of Low Temperature and Structure Research, PAS, Wrocław, Poland

Received: November 16, 2014; In final form: December 26, 2014

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The multi component Fe74Hf4Ta1Cu1Gd1LaxSi15-xB4 (x = 0, 7) alloys are promising candidates in the search for materials with unusual mechanical and magnetic properties. Amorphous nature of melt-spun samples was confirmed by X-ray diffractometry and Mössbauer spectroscopy. The X-ray diffraction patterns revealed a distinct amorphous halo. The low-field components of magnetic hyperfine field distributions on iron nuclei are observed in the Mössbauer spectra, with average hyperfine field values of 19.9 and 15.7 T for x = 0 and x = 7, respectively. Coercivity studied by vibrating sample magnetometer was about 12 A/m for x = 0 and 82 A/m for x = 7 at 300 K and about 600 A/m for x = 0 and 1200 A/m for x = 7 at 400 K. Remanence also changed with temperature, amounting to 0.64 T for x = 0 and 0.36 T for x = 7 at 300 K, while at 400 K it was 0.43 and 0.11 T for x = 0 and x = 7, respectively. It is shown that La addition has beneficial effect of shifting the Curie point towards lower temperatures together with the increase of magnitude of magnetization.

DOI: 10.12693/APhysPolA.127.827 PACS numbers: 75.50.-y, 75.50.Bb, 75.50.Kj, 75.60.Ej, 81.05.Kf, 82.80.Ej, 61.05.Qr