Artículo
Spin-flop transition in small nanoparticles: Internal magnetic study of surface effects
Fecha de publicación:
05/2022
Editorial:
Elsevier Science
Revista:
Journal of Magnetism and Magnetic Materials
ISSN:
0304-8853
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
In this work we study the surface effects on small antiferromagnetic (AF) nanoparticles with diameters ϕ ≤ 11 nm and Néel temperature TN ∼ 12 K under spin-flop conditions by means of Montecarlo simulations. Our model consists of spherical nanoparticles with internal AF ordering and a surface with radial anisotropy. We have considered different values of surface anisotropy (SA) and studied the effect it produces as a function of the particle size. Our results show that by decreasing the size of the nanoparticle, the effective anisotropy of the system increases and with it the spin-flop field. Likewise, the influence of SA induces magnetic disorder that is manifested in the magnetization curves as a function of applied field and temperature. These effects are studied by means of some antiferromagnetic order indicators that provide information about the degree of ordering of the system as a function of SA, particle size and temperature. The spin cluster structures play crucial role on the magnetic behavior of the particle as the size is diminished. We develop a very simple model that reproduce the observed behaviors as function of the SA and particle size for low temperatures.
Palabras clave:
ANTIFERROMAGNETISM
,
NANOPARTICLES
,
SPIN-FLOP TRANSITION
,
SURFACE ANISOTROPY
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Identificadores
Colecciones
Articulos (UE-INN - NODO BARILOCHE)
Articulos de UNIDAD EJECUTORA INSTITUTO DE NANOCIENCIA Y NANOTECNOLOGIA - NODO BARILOCHE
Articulos de UNIDAD EJECUTORA INSTITUTO DE NANOCIENCIA Y NANOTECNOLOGIA - NODO BARILOCHE
Citación
Laura Ccahuana, D.; de Biasi, Emilio; Spin-flop transition in small nanoparticles: Internal magnetic study of surface effects; Elsevier Science; Journal of Magnetism and Magnetic Materials; 549; 5-2022; 1-12
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