@article{10902/28739,
year = {2010},
url = {https://hdl.handle.net/10902/28739},
abstract = {FexAg100?x granular thin films, with 20 x 50, have been prepared by the dc-magnetron sputtering deposition technique. With this technique we have been able to obtain samples comprising small Fe nanoparticles  2.5?3 nm embedded in a Ag matrix, remaining their size practically constant with increasing Fe content. Their magnetic behavior has been fully characterized by dc magnetic measurements between 5?350 K. They have revealed a crossover in the collective magnetic behavior of the Fe nanoparticles around a 35 at. %. Below such a concentration, a collective freezing of the magnetic moments is observed at low temperatures, while at high temperatures a transition, mainly mediated by dipolar interactions, to a magnetically disordered state is obtained. Above this concentration, direct exchange interactions overcome the dipolar magnetic interactions and a long-range order tends to prevail in the range of temperatures analyzed. ac magnetic measurements have indicated a crossover from a superspin glass  x35 to a superferromagnetic  x35 behavior for the magnetic moments of the Fe nanoparticles.},
organization = {This work was supported by the CICYT of Spain under Contracts No. MAT2008-06542-C04-02 and No. MAT2008- 06542-C04-04. SGIker technical support  MEC, GV/EJ, European Social Fund is gratefully acknowledged. The financial support from the Basque Government Department of Education Project No. IT-347-07 is acknowledged.},
publisher = {American Physical Society},
publisher = {Physical Review B - Condensed Matter and Materials Physics, 2010, 82(5), 054406},
title = {Crossover from superspin glass to superferromagnet in FexAg100-x nanostructured thin films ( 20 ≤ x ≤ 50 )},
author = {Alonso, J. and Fdez-Gubieda, M. L. and Barandiarán, J. M. and Svalov, A. and Fernández Barquín, Luis and Alba Venero, Diego and Orue, I.},
}