Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 19, Issue 18, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/19/18/186214
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The study of the magnetic properties depending upon mechanical milling of the ferromagnetic polycrystalline TbAl2 material is reported. Rietveld analysis of the x-ray diffraction data reveals a decrease in the grain size down to 14 nm and a-0.15% variation in the lattice parameter, after 300 h of milling time. Irreversibility in the zero field cooled-field cooled (ZFC-FC) dc susceptibility and clear peaks in the ac susceptibility between 5 and 300 K show that the long-range ferromagnetic structure is inhibited in favour of a disordered spin arrangement below 45 K. This glassy behaviour is also deduced from the variation of the irreversibility transition with the field (H-2/3) and frequency. The magnetization process of the bulk TbAl2 is governed by domain-wall thermal activation processes. In contrast, in the milled samples, cluster-glass properties arise as a result of cooperative interactions due to the substitutional disorder. The interactions are also influenced by the nanograin structure of the milled alloys, showing a variation in coercivity with the grain size, below the crossover between the multi- and single-domain behaviours.
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