STUDI PENGARUH UKURAN GRAIN TERHADAP KOERSIVITAS ALLOYMAGNETIK FESI (SI = 3,2 AT%)
DOI:
https://doi.org/10.30606/aptk.v6i1.92Keywords:
soft magnetic coercivity, grain size.Abstract
Has researched on the influence of grain size of the alloy magnetic coercivity FeSi (Si = 3.2 at%). FeSi alloy (Si = 3.2 at%) was prepared by means of arc melting furnace. To vary the size of the grains, the alloy is annealed in a vacuum at temperatures 800oC for 30, 60 and 90 minutes. The images obtained by micro-grain size on average between 0.337 ± 0.045 mm to 0.427 ± 0.045 mm. XRD results showed that the alloy has been annealed have a higher peak intensity, FWHM width is smaller than the non-annealed alloy. Hysteresis loop of the VSM (vibrating sample magnetometer) was obtained between the coercivity (1.04 ± 0.01) x 103 up to (1.07 ± 0.01) x 103 A / m. The greater the correlation obtained grain size, the smaller coercivity with the coercivity function gain grain size is Hc (A / m) = 0.98 x 103 + 0.03 / D.References
Pesch. J.A. (1971,March). On the correlation between domain size and coercive force in grain-oriented 3,25%Si-Fe, IBM J. Res.Develov.
Coelho. R.E. etc. (2005), Effect of Heat Treatment on Fe-B-Si-Nb Alloy powder prepared by mechanical alloying, (vol. 8, No. 2, 161-163).J. Material Research.
Jiles.D.(1991). Introduction to Magnetism and Magnetic Materials (1sted), Chapman & Hall, USA.
Campos. M.F.dEfect of Grain Size and Crystallie orientation on the Coercivity of Sintered Magnets, DIMAT, Brasil.
Szpunar. J.A. (1989), Anisotropy of Magnetic Properties in Textured Materials, J. Textures and Microstructures(vol. 11, pp 93-105).New York: McGraw-Hill.
Harrel. J.W. (2004), Extrinsic Magnetic Properties (coercivity and all that stuff…), A tutorial
Molnar. G.etc, Thickness dependent aggregation of Fe-Silide island on Si substrate (pg 48-52). thin solid films 459. Elsevier.
Ashcroft.N.W, &Mermin.N.D. (1976), Solid State Physics, Sounders College Publishing, USA.
Cullity. B.D.(1972), Introduction to Magnetic Materials, Addison-Wesley Publishing company Massachusets. USA.
Callister, W.D. Jr (1994). Material Science, and Engineering (3rded), John Wiley and Sons, inc, Canada.
Chikazumi,S.& Stanley H.C(1959). Physics of Magnetism, John Wiley & Sons, Inc. USA.
Herzer. G. (1997), Nanocrystalline soft magnetic alloys(vol. 10), Handbook of Magnetic Materials,. Germany.
Herzer. G. (1990, September), Grain size dependence of coercivity and permeability in nanocrystalline ferromagnets (vol, 26 no.5), IEEE transactions on Magnetics.
