Searching. Please wait…
1583
37
170
29013
4402
2599
347
386
Abstract: A series of GdCu 22 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 ImmaImma 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 ?D???D?? 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 ?D???D?? 25 nm sized NPs.
Fuente: Nanomaterials 2020, 10(6), 1117
Publisher: MDPI
Publication date: 01/06/2020
No. of pages: 16
Publication type: Article
DOI: 10.3390/nano10061117
ISSN: 2079-4991
Spanish project: MAT2017-83631-C3-R
Publication Url: https://doi.org/10.3390/nano10061117
Read publication
ELIZABETH MARTIN JEFREMOVAS
JAVIER ALONSO MASA
MARIA DE LA FUENTE RODRIGUEZ
JESUS MARIA RODRIGUEZ FERNANDEZ
JOSE IGNACIO ESPESO MARTINEZ
DANIEL ROJAS PUPO
ANA GARCIA PRIETO
MARIA LUISA FERNANDEZ-GUBIEDA RUIZ
LUIS FERNANDEZ BARQUIN
Back