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R. Sato Turtelli, D. Triyono, R. Grössinger, H. Michor, J.H. Espina, J.P. Sinnecker, H. Sassik, J. Eckert, G. Kumar, Z.G. Sun, G.J. Fan:
"Coercivity mechanism in Nd₆₀Fe₃₀Al₁₀ and Nd₆₀Fe₂₀Co₁₀Al₁₀ alloys";
Physical Review B, 66 (2002), S. 054441-1 - 054441-8.

Physical Review B (Condensed Matter and Materials Physics)
Print Issue of 1 August 2002

Phys. Rev. B 66, 054441 (2002) (8 pages)

<http://ojps.aip.org/jimages/papers.gif> Full Text: [ PDF (136 kB) GZipped PS Order Document ]
Coercivity mechanism in Nd60Fe30Al10 and Nd60Fe20Co10Al10 alloys

R. Sato Turtelli,1 D. Triyono,1 R. Grössinger,1 H. Michor,1 J. H. Espina,2 J. P. Sinnecker,3 H. Sassik,1 J. Eckert,4 G. Kumar,4 Z. G. Sun,4 and G. J. Fan5 1Inst. f. Festkörperphysik, Techn. Univ. Wien, Wiedner Hauptstrasse 8-10, A1040, Vienna, Austria
2IMRE. Facultad de Física, Universidad de la Habana, San Lázaro y L. Vedado, C. Habana, CP 10400, Cuba
3Inst. de Física, Universidade Federal do Rio de Janeiro, CP 68528, 21945-970-Rio de Janeiro, Brazil
4IFW Dresden, Inst. f. Metallische Werkstoffe, Postfach 27 00 16, D-01171 Dresden, Germany
5Universität Ulm, Abt. Werkstoffe der Electrotechnik, Albert-Einstein-Allee 47, D-89081 Ulm, Germany

(Received 31 January 2002; revised 11 June 2002; published 29 August 2002)

The temperature dependence of the hysteresis loops and susceptibility for the melt-spun ribbon and bulk Nd60Fe30Al10 and Nd60Fe20Co10Al10 alloys were studied. The investigations were performed on as-cast and annealed samples. Measurements of the hysteresis loops with maximum field of µ0Hmax = 22 T were made between 4.2 and 300 K. The temperature dependence of the coercivity follows a law that describes hard magnetic behavior based on pinning-site inhomogeneities interacting with domain walls. A quantitative evaluation of the domain-wall width, the exchange and anisotropy constants was made. The coercivity of the alloys at room temperature depends strongly on the quenching rate and/or on the production method. The room-temperature coercivity of the alloys shows an exponential behavior with the Curie temperature. Depending on the quenching rate, the melt-spun Nd-Fe, Co-Al alloys form distinctly different nonequilibrium phases, indicating that the magnetically hard precursor may vary mainly with quenching rate. ©2002 The American Physical Society

http://link.aps.org/doi/10.1103/PhysRevB.66.054441