ACTA

The Influence of Annealing Temperature on Magnetic Properties of Vitrovac 6030

H.K. Lachowicz^a,b, F. Popławski^a,b, R. Żuberek^a, T. Kulik^c, A. Ślawska-Waniewska^a,b, M. Kuźmiński^a, S.C. Yu^d and E. Dynowska^a
^a Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland
^b College of Science, Al. Lotników 32/46, 02-668 Warszawa, Poland
^c Department of Materials Science & Engineering, Warsaw University of Technology, Narbutta 85, 02-524 Warszawa, Poland
^d Department of Physics, Chungbuk National University, Cheongju, 360-763, Korea

Received: March 2, 1999; revised version April 8, 1999

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Co-Fe-Mo-Mn-Si-B metallic glass ribbon (Vitrovac 6030) was subjected to the isothermal annealing at temperatures in the range 523-873 K so as to produce a series of samples with gradually coarser microstructure. For this series of samples a giant increase in the coercivity, exceeding three orders of magnitude, is observed. This increase is interpreted in terms of the strengthening of the pinning effect of the nanocrystalline structure on the moving domain walls. It is shown that the anisotropy of the created crystallites is mainly responsible for the increase in the pinning force since the effective anisotropy seen by the wall becomes larger and larger with the gradual increase in the density and size of the grown particles.

DOI: 10.12693/APhysPolA.96.483
PACS numbers: 75.50.Cc, 75.50.Kj, 75.60.Ch