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  Intriguing Prospects of a Novel Magnetic Nanohybrid Material: Ferromagnetic FeRh Nanoparticles Grown on Nanodiamonds

Ziogas, P., Bourlinos, A. B., Chatzopoulou, P., Dimitrakopulos, G. P., Kehagias, T., Markou, A., et al. (2022). Intriguing Prospects of a Novel Magnetic Nanohybrid Material: Ferromagnetic FeRh Nanoparticles Grown on Nanodiamonds. Metals, 12(8): 1355, pp. 1-20. doi:10.3390/met12081355.

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 Creators:
Ziogas, Panagiotis1, Author
Bourlinos, Athanasios B.1, Author
Chatzopoulou, Polyxeni1, Author
Dimitrakopulos, George P.1, Author
Kehagias, Thomas1, Author
Markou, Anastasios2, Author           
Douvalis, Alexios P.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              

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 Abstract: A novel endeavor based on the synthesis, characterization and study of a hybrid crystalline magnetic nanostructured material composed of bimetallic iron-rhodium nanoalloys, grown on nanodiamond nanotemplates, is reported in this study. The development of this hybrid magnetic nanomaterial is grounded in the combination of wet chemistry and thermal annealing under vacuum. In order to assess, evaluate and interpret the role and special properties of the nanodiamond supporting nanotemplates on the growth and properties of the bimetallic ferromagnetic Fe-Rh nanoparticles on their surfaces, unsupported free FeRh nanoparticles of the same nominal stoichiometry as for the hybrid sample were also synthesized. The characterization and study of the prepared samples with a range of specialized experimental techniques, including X-ray diffraction, transmission and scanning transmission electron microscopy with energy dispersive X-ray analysis, magnetization and magnetic susceptibility measurements and Fe-57 Mossbauer spectroscopy, reveal that thermal annealing of the hybrid sample under specific conditions (vacuum, 700 degrees C, 30 min) leads to the formation of a rhodium-rich FeRh alloy nanostructured phase, with an average particle size of 4 nm and good dispersion on the surfaces of the nanodiamond nanotemplates and hard ferromagnetic characteristics at room temperature (coercivity of similar to 500 Oe). In contrast, thermal annealing of the unsupported free nanoparticle sample under the same conditions fails to deliver ferromagnetic characteristics to the FeRh nanostructured alloy phase, which shows only paramagnetic characteristics at room temperature and spin glass ordering at low temperatures. The ferromagnetic nanohybrids are proposed to be exploited in a variety of important technological applications, such as magnetic recording, magnetic resonance imaging contrast and magnetic hyperthermia agents.

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Language(s): eng - English
 Dates: 2022-08-152022-08-15
 Publication Status: Published in print
 Pages: -
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 Rev. Type: -
 Identifiers: ISI: 000845406800001
DOI: 10.3390/met12081355
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Title: Metals
  Other : Metals
Source Genre: Journal
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Publ. Info: Basel : MDPI AG
Pages: - Volume / Issue: 12 (8) Sequence Number: 1355 Start / End Page: 1 - 20 Identifier: ISSN: 2075-4701
CoNE: https://pure.mpg.de/cone/journals/resource/metals