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Abstract: An alloy of Fe35Al50B15 has been prepared by milling under vacuum for 840 h. The X-ray diffraction pattern shows only two broad peaks stemming from a highly disordered structural state. The magnetic state was characterized by AC susceptibility. It displays sharp maxima around 20 K (21 K) in the real (complex) components. The maxima are due to the onset of a spin frozen disordered arrangement, and shift to higher temperature with increasing frequency. The magnetic dynamics is accounted for a power-law in the vicinity of the transition. Values of zv = 9.0(3) and T0 = 19.5(1) K are obtained. Complex susceptibility dynamic scaling results in a large ß = 1.3(1). The values extracted for the critical exponents are close to those of glassy magnets and are an indication of a nonconventional transition. The nonlinear susceptibility reveals a peak at the transition, which is affected by the oscillating h <; 5 Oe and biasing (HDC = 40 Oe) fields. The results are interpreted in terms of the freezing of very fine Fe-rich magnetic particles which are present as the result of an incomplete compositional homogenization despite the long milling time.
Fuente: IEEE TRANSACTIONS ON MAGNETICS, VOL. 50, NO. 11, NOVEMBER 2014
Editorial: Institute of Electrical and Electronics Engineers Inc.
Fecha de publicación: 01/11/2014
Nº de páginas: 5
Tipo de publicación: Artículo de Revista
DOI: 10.1109/TMAG.2014.2324896
ISSN: 0018-9464,1941-0069
Proyecto español: MAT2011-27573-C04-01
Url de la publicación: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6971453
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DIEGO ALBA VENERO
LUIS FERNANDEZ BARQUIN
DE TORO, J. A.
RIVEIRO, J. M.
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