Investigating the Size and Microstrain Influence in the Magnetic Order/Disorder State of GdCu2 Nanoparticles
| Autor: | M. de la Fuente Rodríguez, J. Rodríguez Fernández, J.I. Espeso, Ana García-Prieto, L. Fernández Barquín, Javier Alonso, E. M. Jefremovas, D.P. Rojas, M. L. Fernández-Gubieda |
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| Přispěvatelé: | Universidad de Cantabria |
| Rok vydání: | 2020 |
| Předmět: |
Diffraction
magnetic nanoparticles Materials science Spin glass General Chemical Engineering media_common.quotation_subject rare earth intermetallics Nanoparticle Frustration 02 engineering and technology magnetic coupling 01 natural sciences lcsh:Chemistry 0103 physical sciences General Materials Science 010306 general physics Ball mill Spin Glass media_common Magnetic moment Condensed matter physics 021001 nanoscience & nanotechnology X-ray diffraction lcsh:QD1-999 X-ray crystallography Magnetic nanoparticles 0210 nano-technology |
| Zdroj: | Addi: Archivo Digital para la Docencia y la Investigación Universidad del País Vasco Nanomaterials 2020, 10(6), 1117 UCrea Repositorio Abierto de la Universidad de Cantabria Universidad de Cantabria (UC) Addi. Archivo Digital para la Docencia y la Investigación Nanomaterials Volume 10 Issue 6 instname Nanomaterials, Vol 10, Iss 1117, p 1117 (2020) |
| Popis: | A series of GdCu 2 nanoparticles with controlled sizes ranging from 7 nm to 40 nm has been produced via high-energy inert-gas ball milling. Rietveld refinements on the X-ray diffraction measurements ensure that the bulk crystalline I m m a structure is retained within the nanoparticles, thanks to the employed low milling times ranging from t = 0.5 to t = 5 h. The analysis of the magnetic measurements shows a crossover from Superantiferromagnetism (SAF) to a Super Spin Glass state as the size decreases at NP size of &lang D &rang &asymp 18 nm. The microstrain contribution, which is always kept below 1%, together with the increasing surface-to-core ratio of the magnetic moments, trigger the magnetic disorder. Additionally, an extra contribution to the magnetic disorder is revealed within the SAF state, as the oscillating RKKY indirect exchange achieves to couple with the aforementioned contribution that emerges from the size reduction. The combination of both sources of disorder leads to a maximised frustration for &lang 25 nm sized NPs. |
| Databáze: | OpenAIRE |
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