Hyperfine Interactions and Some Magnetic Properties of Nanocrystalline Co40Fe50Ni10 and Co50Fe45Ni5 Alloys Prepared by Mechanical Synthesis and Subsequently Heat Treated

T. Pikulaa, D. Oleszakb and M. Pękałac aInstitute of Physics, Technical University of Lublin, Nadbystrzycka 38, 20-618 Lublin, Poland bFaculty of Materials Science and Engineering, Warsaw University of Technology,, Wołoska 141, 02-507 Warsaw, Poland cDepartment of Chemistry, Warsaw University, Al. Żwirki i Wigury 101, 02-089 Warsaw, Poland

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Co40Fe50Ni10 and Co50Fe45Ni5 ternary alloys were prepared by mechanical alloying method. To check the stability of their structure thermal treatment was applied subsequently. As X-ray diffraction studies proved the final products of milling were the solid solutions with bcc lattice and the average grain sizes ranged of tens of nanometers. After heating of the Co50Fe45Ni5 alloy up to 993 K the mixture of two solid solutions with bcc and fcc lattices was formed. In other cases thermal treatment did not change the type of the crystalline lattice. Mössbauer spectroscopy revealed hyperfine magnetic field distributions which reflected the different possible atomic surroundings of 57Fe isotopes. Results of the macroscopic magnetic measurements proved that both investigated alloys had relatively good soft magnetic properties.

DOI: 10.12693/APhysPolA.119.52 PACS numbers: 81.20.Ev, 75.50.Kj, 61.10.-i, 76.80.+y, 75.60.Ej