Coercivity and its thermal dependence in microsized magnetic particles: Influence of grain boundaries



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Marín Palacios, María Pilar and Aragón, A. M and Garcia Escoria, A. and Lieblich, M. and Crespo del Arco, Patricia and Hernando Grande, Antonio (2013) Coercivity and its thermal dependence in microsized magnetic particles: Influence of grain boundaries. Journal of applied physics, 113 (4). ISSN 0021-8979

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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.

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© 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

Uncontrolled Keywords:Fe-Cu; Nanocrystalline Fe; Alloys; Soft; Anisotropy; Mossbauer; Behavior; Wires; Iron.
Subjects:Sciences > Physics > Materials
ID Code:41614
Deposited On:10 Mar 2017 15:07
Last Modified:14 Feb 2018 14:35

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