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Appl. Sci. 2012, 2(2), 315-326; doi:10.3390/app2020315

Anomalous Magnetization Enhancement and Frustration in the Internal Magnetic Order on (Fe0.69Co0.31)B0.4 Nanoparticles

1
Centro Atómico Bariloche, CNEA-CONICET, 8400 S.C. de Bariloche, RN, Argentina
2
Facultad de Ciencias, Departamento de Física, Universidad de Los Andes, Mérida, 5101, Venezuela
Present address: Intitut National de l’Energie Solaire-Commissariat à l’Energie Atomique, 50 avenue du lac Léman, 73375 Le Bourget du Lac, France.
*
Author to whom correspondence should be addressed.
Received: 14 February 2012 / Revised: 19 March 2012 / Accepted: 23 March 2012 / Published: 2 April 2012
(This article belongs to the Special Issue Magnetic Nanoparticles: Synthesis, Properties and Applications)
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Abstract

We have studied the internal magnetic order of 3-nm (Fe0.69Co0.31)0.6B0.4 amorphous nanoparticles. These nanoparticles were dispersed in a non-magnetic matrix (non-interacting nanoparticles) to contrast them with the powder samples, where strong interparticle interactions are present. In similar fashion to the bulk alloy, this system exhibits a saturation magnetization maximum as a function of Fe composition near 69 at% Fe for the powder and dispersed samples at all temperatures. The saturation magnetization (MS) of the dispersed sample shows anomalous behavior, revealing frustration in the internal magnetic order of the particles. Unexpectedly, the MS of the non-interacting sample at low temperatures is larger than the corresponding bulk alloy or the calculated value of MS for the same Fe-Co composition. By contrast, the powder sample has low MS values and it is approximately constant in temperature. View Full-Text
Keywords: fine-particle systems; amorphous magnetic materials; Fe-Co-B alloys; magnetic anisotropy; magnetization enhancement fine-particle systems; amorphous magnetic materials; Fe-Co-B alloys; magnetic anisotropy; magnetization enhancement
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MDPI and ACS Style

Molina-Concha, B.; Zysler, R.D.; Romero, H. Anomalous Magnetization Enhancement and Frustration in the Internal Magnetic Order on (Fe0.69Co0.31)B0.4 Nanoparticles. Appl. Sci. 2012, 2, 315-326.

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