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

0584130 - BC 2024 RIV US eng J - Journal Article
Tortarolo, M. - Mijovilovich, Ana - Macedo, W. A. A. - Zysler, R. D. - Ramos, C. P.
Magnetic behavior of oxide passivated (Fe0.85Nd0.15)0.6B0.4 amorphous nanoparticles.
MRS Communications. Roč. 13, č. 3 (2023), s. 438-444. ISSN 2159-6859. E-ISSN 2159-6867
R&D Projects: GA MŠMT EF15_003/0000336
Institutional support: RVO:60077344
Keywords : chemical-synthesis * mossbauer * Rare earths * Amorphous * Nanostructure * Magnetic properties * Mossbauer effect
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 1.9, year: 2022
Method of publishing: Limited access
https://link.springer.com/article/10.1557/s43579-023-00368-9

We report on magnetic amorphous (Fe0.85Nd0.15)(0.6)B-0.4 nanoparticles showing an enhanced thermagnetic stability regarding to their size, with a blocking temperature higher than room temperature. Magnetization and Mossbauer 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.
Permanent Link: https://hdl.handle.net/11104/0352337