anomalous magnetization enhancement and frustration in the internal magnetic order on (fe0.69co0.31)b0.4 nanoparticles异常磁化增强和沮丧在内部磁单(fe0.69co0.31)b0.4纳米颗粒.pdfVIP

Appl. Sci. 2012, 2, 315-326; doi:10.3390/app2020315 OPEN ACCESS applied sciences ISSN 2076-3417 /journal/applsci Article Anomalous Magnetization Enhancement and Frustration in the Internal Magnetic Order on (Fe0.69Co0.31)B0.4 Nanoparticles Belén Molina-Concha 1,†, Roberto D. Zysler 1,* and Héctor Romero 2 1 Centro Atómico Bariloche, CNEA-CONICET, 8400 S.C. de Bariloche, RN, Argentina; E-Mail: molinacb@ 2 Facultad de Ciencias, Departamento de Física, Universidad de Los Andes, Mérida, 5101, Venezuela; E-Mail: hectorom@ula.ve † 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; E-Mail: zysler@.ar; Tel.: +54-294-444-5158; Fax: +54-294-444-5299. Received: 14 February 2012; in revised form: 19 March 2012 / Accepted: 23 March 2012 / Published: 2 April 2012 Abstract: We have studied the internal magnetic order of 3-nm (Fe Co ) B 0.69 0.31 0.6 0.4 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