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Magnetic behavior of oxide passivated (Fe0.85Nd0.15)0.6B0.4 amorphous nanoparticles

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Abstract

We report on magnetic amorphous (Fe0.85Nd0.15)0.6B0.4 nanoparticles showing an enhanced thermagnetic stability regarding to their size, with a blocking temperature higher than room temperature. Magnetization and Mössbauer spectroscopy results suggest that the ideally spherical nanoparticles conformation is almost equally distributed between an ordered core and an iron oxide shell (Fe2O3). Magnetization measurements are described by a phenomenological model comprising a ferromagnetic core represented by the Bloch´s law and a magnetically disordered contribution obeying the Curie law. The interaction of the core with the oxide shell would be enough to thermally stabilize the nanoparticles against superparamagnetism.

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Notes

  1. A TB ~ 380 K was estimated by fitting the coercive field vs. temperature using the Stoner-Wolfarth model.

  2. To calculate the Msat of the alloy, only the ferromagnetic contribution of the Fe was considered, given that Nd is paramagnetic at RT and it is consequently not saturated.[N. W. Ashcroft and N. D. Mermin, Solid State Physiscs, Saunders College Publishing, 1976].

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Acknowledgments

We thank Dr D. Lamas for the fruitful discussions on XRD characterization. Nanoparticles were synthesized by Dr H. Romero, Universidad de los Andes, Mérida, Venezuela.

Funding

A. Mijovilovich is grateful for funding by the Ministry of Education, Youth and Sports of the Czech Republic with co-financing from the EU (Grant ¨KOROLID¨, CZ.02.1.01/0.0/0.0/15_003/0000336) and the Czech Academy of Sciences (RVO 600 600 77 344). M. Tortarolo, R. D. Zysler and C. P. Ramos thank CNEA and INN.

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Authors and Affiliations

  1. Instituto de Nanociencia y Nanotecnología (INN), CNEA-CONICET, Buenos Aires, Argentina

    M. Tortarolo & C. P. Ramos

  2. Departamento de Física de la Materia Condensada, GIyA-CNEA, Av., General Paz 1499, (1650) San Martín, Buenos Aires, Argentina

    M. Tortarolo & C. P. Ramos

  3. Biology Centre, Plant Biophysics & Biochemistry Laboratory, Czech Academy of Sciences, Institute of Plant Molecular Biology, Branišovská 31/1160, 37005, Ceske Budejovice, Czech Republic

    A. Mijovilovich

  4. Centro de Desenvolvimento da Tecnologia Nuclear, Comissão Nacional de Energia. Av. Presidente Antônio Carlos, 6.627, Campus da UFMG—Pampulha, Belo Horizonte, Minas Gerais, 31270-901, Brazil

    W. A. A. Macedo

  5. Instituto de Nanociencia y Nanotecnología (INN), CNEA-CONICET, Río Negro, Argentina

    R. D. Zysler

  6. Centro Atómico Bariloche, 8400. S.C. de Bariloche, Río Negro, Argentina

    R. D. Zysler

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  1. M. Tortarolo
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  4. R. D. Zysler
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Correspondence to C. P. Ramos.

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Tortarolo, M., Mijovilovich, A., Macedo, W.A.A. et al. Magnetic behavior of oxide passivated (Fe0.85Nd0.15)0.6B0.4 amorphous nanoparticles. MRS Communications 13, 438–444 (2023). https://doi.org/10.1557/s43579-023-00368-9

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