Magnetic Study Of Fe65ni20nb6b9 Nanocomposite Alloys

The alloy Fe65Ni20Nb6B9 was obtained from the elemental constituents in a high-energy planetary ball mill and subsequently thermally treated at 873 and 900 K in order to obtain the equilibrium phases. The as-prepared nanocrystalline alloy consists primarily of metastable BCC α-Fe(Ni) nanocrystals while the treated ones consist of a mixture of BCC (ferromagnetic) and FCC (paramagnetic at room temperature) phases. Hysteresis loops at 5 and 300 K present low remanence and coercivity. As-prepared sample exhibits the best soft magnetic properties. In all samples, the susceptibility curves suggest magnetic collective (long-range order) behavior with a maximum between 70 and 90 K. This feature is caused by nanometric-sized magnetic particles. The huge difference between blocking and irreversibility temperatures in the field cooling and zero-field cooling scans indicates a wide grain-size distribution. © 2004 Elsevier B.V. All rights reserved.3541-4 SPEC. ISS.129132Morris, D.G., (1981) Acta Metall., 29, p. 1213Zélis, P.M., Torres, C.R., Cabrera, A.F., Van Raap, M.F., Pasquevich, G., Sánchez, F.H., González, A., Suñol, J.J., (2004) J. Metastable. Nanocryst. Mater., 20, p. 571Lehlooh, A.D., Mahmood, S.H., (2002) Hyperfine Interact., 139-140, p. 387Stek, J., Lipka, J., Miglierini, M., Toth, I., (1995) J. Magn. Magn. Mater., 140-144, p. 441Wijn, H.P.J., (1991) Magnetic Properties of Metals, , Springer, GermanyRancourt, D.G., Chehab, S., Lamarche, G., (1989) J. Magn. Magn. Mater., 78, p. 129Chien, C.L., (1991) J. Appl. Phys., 69, p. 5267Cezar, J.C., Tolentino, H.C.N., Knobel, M., (2001) J. Magn. Magn. Mater., 233, p. 10