Year: 2025
Type: article
Abstract: C and metallic-Fe) were also detected through X-ray absorption spectroscopy and Mössbauer spectrometry. Moreover, the dynamics of the system was explored by means of AC susceptibility, magnetic memory and relaxation measurements, together with low-temperature exchange bias, suggesting the emergence of a spin-glass-like state that remains robust under magnetic cooling fields up to 140 kOe. These findings point to a strong exchange coupling between the spins in the ordered core and those on the disordered surface of the maghemite nanoparticles. Furthermore, the identification of robust spin-glass behaviour under high cooling fields and the demonstration of coexisting blocked and superparamagnetic phases at room temperature provide valuable insights for applications in magnetic data storage and spintronics.
Source: Nanoscale Advances
DOI: 10.1039/d5na00493d
Authors: M. González de la Vega, M. P. Fernández-García, L. Marcano, N. Yaacoub, J. M. Grenèche, D. Martínez-Blanco, A. Adawy, M. Sevilla, A. B. Fuertes, Jesús A. Blanco, Pedro Gorria
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,962
OpenAlex ID: W4412977252