Tailoring soft and hard magnets by annealing Co-based metallic glass

H.K. Lachowicz , Tadeusz Kulik , R. Żuberek , L. Małkiński , Marek Kuźmiński , A. Ślawska-Waniewska , J.S. Muñoz

Abstract

Co67Fe4Mo2Si17B11 metallic glass ribbon has been subjected to the isothermal annealing at temperatures in the range 250–600°C so as to produce a series of samples with gradually coarser microstructure. For this series of samples a giant increase of the coercivity, exceeding five orders of magnitude, is observed. It shows a possibility to tailor soft or hard magnets using the same parent material. An abrupt increase of the coercivity occurs in a relatively small range of annealing temperatures between 480 and 520°C, and is mainly due to a strengthening of the pinning effect of the precipitates (fine crystalline structure) on the domain walls. Samples annealed at higher temperatures become fully crystallized. First, the metastable phase(s) is created which decomposes to the stable phases at still higher temperature. Coercivity for fully crystallized samples shows first a narrow plateau and afterwards a gradual decrease of its value with increasing temperature of annealing. Magnetic and microstructural properties of the samples, annealed at various temperatures, were investigated applying a number of complementary techniques including DSC and TGM methods, X-ray diffraction, TEM, strain-modulated FMR spectroscopy as well as conventional magnetic measurements.
Author H.K. Lachowicz
H.K. Lachowicz,,
-
, Tadeusz Kulik ZMKF
Tadeusz Kulik,,
- Division of Construction and Functional Materials
, R. Żuberek
R. Żuberek,,
-
, L. Małkiński
L. Małkiński,,
-
, Marek Kuźmiński IETSIP
Marek Kuźmiński,,
- The Institute of the Theory of Electrical Engineering, Measurement and Information Systems
, A. Ślawska-Waniewska
A. Ślawska-Waniewska,,
-
, J.S. Muñoz
J.S. Muñoz,,
-
Journal seriesJournal of Magnetism and Magnetic Materials, ISSN 0304-8853
Issue year1998
Vol190
No3
Pages267-276
Keywords in EnglishCoercivity, Crystallization, domain wall pinning, ferromagnetic resonance, Metallic glasses, Microstructure
DOIDOI:10.1016/S0304-8853(98)00256-X
URL http://www.sciencedirect.com/science/article/pii/S030488539800256X
Score (nominal)25
Publication indicators WoS Impact Factor: 2006 = 1.212 (2) - 2007=1.358 (5)
Citation count*10 (2013-01-30)
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