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Spin-glass magnetism of the non-equiatomic CoCrFeMnNi high-entropy alloy

Spin-glass magnetism of the non-equiatomic CoCrFeMnNi high-entropy alloy

Authors :
Darja Gačnik
Zvonko Jagličić
S. Vrtnik
Frédéric Danoix
Primož Koželj
Anton Meden
Mitja Krnel
Janez Dolinšek
Magdalena Wencka
Goran Dražić
Michael Feuerbacher
Julian Ledieu
Andreja Jelen
Jozef Stefan Institute [Ljubljana] (IJS)
Institute of Molecular Physics
Polska Akademia Nauk = Polish Academy of Sciences (PAN)
University of Ljubljana
National Institute of Chemistry
Groupe de physique des matériaux (GPM)
Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie)
Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN)
Normandie Université (NU)
Institut Jean Lamour (IJL)
Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
Forschungszentrum Jülich GmbH | Centre de recherche de Juliers
Helmholtz-Gemeinschaft = Helmholtz Association
Université de Rouen Normandie (UNIROUEN)
Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie)
Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA)
Université de Caen Normandie (UNICAEN)
Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN)
Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN)
Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie)
Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN)
Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN)
Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)
Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)
Source :
Journal of Magnetism and Magnetic Materials, Journal of Magnetism and Magnetic Materials, Elsevier, 2021, 523, pp.167579. ⟨10.1016/j.jmmm.2020.167579⟩, Journal of Magnetism and Magnetic Materials, 2021, 523, pp.167579. ⟨10.1016/j.jmmm.2020.167579⟩, Journal of magnetism and magnetic materials 523, 167579-(2021). doi:10.1016/j.jmmm.2020.167579
Publication Year :
2021
Publisher :
HAL CCSD, 2021.

Abstract

The CoCrFeMnNi high-entropy alloy (HEA) is a magnetically concentrated crystalline system with all lattice sites magnetic, containing randomness (five different types of spins are randomly positioned on the lattice) and frustration (a consequence of mixed ferromagnetic and antiferromagnetic interactions). The sample material was prepared as a non-equiatomic, fully random solid solution of the five magnetic elements and we have studied experimentally the nature of the magnetic state. Upon cooling, no long-range magnetic ordering takes place, but the spin system undergoes a kinetic freezing transition to a spin glass phase, where below the spin freezing temperature T f ≈ 20 K, ergodicity of the system is broken. The observed broken-ergodicity phenomena include zero-field-cooled – field-cooled magnetization splitting in low magnetic fields, a frequency-dependent cusp in the ac susceptibility, an ultraslow time-decay of the thermoremanent magnetization and the memory effect, where the state of the spin system reached upon isothermal aging at a certain temperature can be retrieved after a reverse temperature cycle. All these phenomena are associated with the out-of-equilibrium dynamics of a nonergodic, frustrated system of coupled spins that approach thermal equilibrium, but can never reach it on a finite experimental time scale, so that we are observing only transient effects of partial equilibration within localized spin domains.

Details

Language :
English
ISSN :
03048853
Database :
OpenAIRE
Journal :
Journal of Magnetism and Magnetic Materials, Journal of Magnetism and Magnetic Materials, Elsevier, 2021, 523, pp.167579. ⟨10.1016/j.jmmm.2020.167579⟩, Journal of Magnetism and Magnetic Materials, 2021, 523, pp.167579. ⟨10.1016/j.jmmm.2020.167579⟩, Journal of magnetism and magnetic materials 523, 167579-(2021). doi:10.1016/j.jmmm.2020.167579
Accession number :
edsair.doi.dedup.....319d0dc3cf5cc3c1b20c877bc9ba38e0
Full Text :
https://doi.org/10.1016/j.jmmm.2020.167579⟩