@article{10902/28168,
year = {2022},
url = {https://hdl.handle.net/10902/28168},
abstract = {The spin dynamics in magnetically disordered GdCu2 nanoparticles, varying the nanoparticle size in the range 53 to 7 nm, has been scrutinized. Dynamic χAC susceptibility measurements have revealed the existence of dissipation at Tg = 18 K, which is associated to the spin freezing transition, for all the ensembles. Besides, the superantiferromagnetic ensembles (〈D〉≥ 24 nm) also showcase a dissipation contribution close to the vicinity of the Néel transition, TN = 40.2 K. This dissipation, which takes the form of two humps located at Td1 = 33.5(5) K and Td2 = 40.0(5) K, is associated to uncompensated antiferromagnetic moments. Time-dependent phenomena (ageing and memory effects) are only evidenced below the spin freezing transition, evidencing that solely this low-temperature disordered phase is driven by the frustration of RKKY exchange interactions. Consequently, GdCu2 nanoparticles display a dual disorder-driven magnetic dynamics, which are the one ascribed to the magnetically frustrated moments located at the nanoparticle surface; and that of uncompensated antiferromagnetic moments located within the nanoparticle core.},
organization = {Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. This work has been financially supported by Spanish MCIU MAT2017–83631–C3–R project. EMJ work was supported by ‘Beca Concepción Arenal’ BDNS: 406333 (Gobierno de Cantabria–Universidad de Cantabria).},
publisher = {Springer},
publisher = {Journal of Nanoparticle Research, 2022, 24, 194},
title = {Dual disorder-driven magnetic dynamics in GdCu2 superantiferromagnetic nanoparticles},
author = {Martín Jefremovas, Elisabeth and Svedlindh, Peter and Fernández Barquín, Luis},
}