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

P. Koželj (1) , S. Vrtnik (1) , M. Krnel (1) , A. Jelen (1) , D. Gačnik (1) , M. Wencka (2) , Z. Jagličić (3) , A. Meden (3) , G. Dražić (4) , Frederic Danoix (5) , J. Ledieu (6) , M. Feuerbacher (7) , J. Dolinšek (1)

1 IJS - Jozef Stefan Institute [Ljubljana]
2 IMP - Institute of Molecular Physics
3 University of Ljubljana
4 KI - National Institute of Chemistry [Llubljana]
5 GPM - Groupe de physique des matériaux
6 IJL - Institut Jean Lamour
7 FZJ - Forschungszentrum Jülich GmbH | Centre de recherche de Jülich | Jülich Research Centre

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 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.

Mots clés: High-entropy alloys; Spin glasses

Domaines: Matériaux

P. Koželj, S. Vrtnik, M. Krnel, A. Jelen, D. Gačnik, et al.. Spin-glass magnetism of the non-equiatomic CoCrFeMnNi high-entropy alloy. Journal of Magnetism and Magnetic Materials, 2021, 523, pp.167579. ⟨10.1016/j.jmmm.2020.167579⟩. ⟨hal-03365254⟩