Coercivity mechanism in Nd 60 Fe 30 Al 10 and Nd 60 Fe 20 Co 10 Al 10 alloys

R. Sato Turtelli, Djoko Triyono, R. Grössinger, H. Michor, J. H. Espina, J. P. Sinnecker, H. Sassik, J. Eckert, G. Kumar, Z. G. Sun, G. J. Fan

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48 Citations (Scopus)


The temperature dependence of the hysteresis loops and susceptibility for the melt-spun ribbon and bulk Nd 60 Fe 30 Al 10 and Nd 60 Fe 20 Co 10 Al 10 alloys were studied. The investigations were performed on as-cast and annealed samples. Measurements of the hysteresis loops with maximum field of μ 0 H max = 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.

Original languageEnglish
Article number054441
Pages (from-to)544411-544418
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number5
Publication statusPublished - 1 Aug 2002


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