Coexistence of ferromagnetism and spin glass state in YbNi2 nanoparticles

Rojas Pupo, Daniel ORCID: https://orcid.org/0000-0002-5620-8586, Fernández Barquín, L., Espeso, J.I., Rodríguez Fernández, J., Alba Venero, D., Gallastegui, J.A., Castro, G.R. and Ivanshin, V.A. (2019). Coexistence of ferromagnetism and spin glass state in YbNi2 nanoparticles. "Journal of Magnetism And Magnetic Materials", v. 475 ; pp. 264-270. ISSN 0304-8853. https://doi.org/10.1016/j.jmmm.2018.11.123.

Description

Title: Coexistence of ferromagnetism and spin glass state in YbNi2 nanoparticles
Author/s:
Item Type: Article
Título de Revista/Publicación: Journal of Magnetism And Magnetic Materials
Date: April 2019
ISSN: 0304-8853
Volume: 475
Subjects:
Freetext Keywords: Yb alloys; Ferromagnetic; Spin glass; Magnetic properties; Specific heat
Faculty: E.T.S. Arquitectura (UPM)
Department: Estructuras y Física de Edificación
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

We report changes on the magnetic behavior of the Heavy-Fermion ferromagnetic YbNi2 alloy when reducing the size of the particles to the nanometer scale by high-energy ball milling. The milling process induces a reduction on the particle size of the bulk alloy down to 10 (2) nm and a lattice strain of 1.8 (2)%, for 30 h of milling time, as calculated from the X-ray diffraction data. The ferromagnetic transition at TC = 10.5 K in the bulk alloy tends to disappear whereas other magnetic transitions arise at lower temperatures with the milling process. The AC magnetic susceptibility of the 30 h milled sample shows a frequency independent peak at 3 K, in a wide range of frequencies, consistent neither with superparamagnetic nor simple freezing of the magnetic moments, and as expected for a ferromagnetic behavior. However, from the specific heat measurements in the 30 h milled sample, a peak at 3.6 K is shifted respect to that observed in the AC magnetic susceptibility, as found in spin glasses. The results are explained by the influence of magnetic inhomogeneities and disorder of the alloys enhanced by the milling process in the ensemble of nanoparticles.

Funding Projects

Type
Code
Acronym
Leader
Title
Government of Spain
MAT2017-83631-C3-R
Unspecified
Unspecified
Unspecified

More information

Item ID: 63552
DC Identifier: https://oa.upm.es/63552/
OAI Identifier: oai:oa.upm.es:63552
DOI: 10.1016/j.jmmm.2018.11.123
Official URL: https://www.sciencedirect.com/science/article/pii/...
Deposited by: Memoria Investigacion
Deposited on: 04 Sep 2020 06:00
Last Modified: 04 Sep 2020 06:00
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