RT Journal Article
T1 Coercivity and its thermal dependence in microsized magnetic particles: Influence of grain boundaries
A1 Marín Palacios, María Pilar
A1 Aragón, A. M
A1 Garcia Escoria, A.
A1 Lieblich, M.
A1 Crespo del Arco, Patricia
A1 Hernando Grande, Antonio
AB Fe_(73.5)Si_(13.5)B_9Nb_3Cu_1 powder particles have been obtained by gas atomization. Magnetization curves and coercivity were studied for particles ranging in size up to 1000μ. The overall magnetic behavior of such material is  consequence of compositional heterogeneity of the microstructure as a whole. Anomalous temperature variation of coercivity (H_c) (i.e., a decrease in H_c with decreasing temperature) together with a decrease of saturation magnetization has been observed for less than 25 μm size. The origin of this behavior has been ascribed to metastable FeCu and FeNbSi phases in combination with an Fe-rich one. Making magnetic powders with coercive fields of the order of mOe remains a challenge for researchers. Our  experiment has allowed us, at low temperature, achieving a coercive field of 9 Oe, much lower than those observed so far in this type of materials. This behaviour has been related with a FeCu phase present on grain boundaries.
PB American Institute of Physics
SN 0021-8979
YR 2013
FD 2013-01-28
LK https://hdl.handle.net/20.500.14352/35406
UL https://hdl.handle.net/20.500.14352/35406
LA eng
NO © 2013 American Institute of Physics.This work has been supported by the MEC of Spain:  Consolider-Ingenio 2010 Contract Nos. CSD2007- 0010, MAT2009-14741-C02-01, and S2009 MAT
NO Ministerio de Economía y Competitividad (MINECO)
NO Comunidad de Madrid
DS Docta Complutense
RD 10 abr 2025