Kung-Te Chu et al 2005 J. Phys. D: Appl. Phys. 38 4009 doi:10.1088/0022-3727/38/22/002
Kung-Te Chu, Z Q Jin, Vamsi M Chakka and J P Liu
Show affiliationsA systematic study of heat treatments and magnetic hardening of NdFeB-based melt-spun nanocomposite ribbons have been carried out. Comparison was made between samples treated by rapid thermal annealing and by conventional furnace annealing. Heating rates up to 200 K s−1 were adopted in the rapid thermal processing. It was observed that magnetic hardening can be realized in an annealing time as short as 1 s. Coercivity of 10.2 kOe in the nanocomposites has been obtained by rapid thermal annealing for 1 s, and prolonged annealing did not give any increase in coercivity. Detailed results on the effects of annealing time, temperature and heating rate have been obtained. The dependence of magnetic properties on the annealing parameters has been investigated. Structural characterization revealed that there is a close correlation between magnetic hardening and nanostructured morphology. The coercivity mechanism was also studied by analysing the magnetization minor loops.
81.40.Gh Other heat and thermomechanical treatments
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
Condensed matter: electrical, magnetic and optical
Issue 22 (21 November 2005)
Received 4 August 2005, in final form 25 September 2005
Published 7 November 2005
A Corrigendum for this article has been published in 2006 J. Phys. D: Appl. Phys. 39 429
Kung-Te Chu et al 2005 J. Phys. D: Appl. Phys. 38 4009
Carsten Hutter et al 2006 Europhys. Lett. 74 1088
Marcel Risch et al 2009 J. Phys.: Conf. Ser. 190 012167
Juan Xiong et al 2009 J. Phys. G: Nucl. Part. Phys. 36 125005
Yohan Seo et al 2009 Semicond. Sci. Technol. 24 115016
T Yajima and H Nagahama 2007 J. Phys. A: Math. Theor. 40 2755
M V Ioffe and P A Valinevich 2005 J. Phys. A: Math. Gen. 38 2497
P L Krapivsky 1991 J. Phys. A: Math. Gen. 24 4697
P A Coe et al 2004 Meas. Sci. Technol. 15 2175
J D Moulton et al 2008 J. Phys.: Conf. Ser. 124 012035