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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
- 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.
- Subjects :
- Spin glass
Materials science
Thermoremanent magnetization
High-entropy alloys
Magnetism
media_common.quotation_subject
Frustration
02 engineering and technology
7. Clean energy
01 natural sciences
[SPI.MAT]Engineering Sciences [physics]/Materials
Magnetization
Spin glasses
0103 physical sciences
Antiferromagnetism
ddc:530
media_common
010302 applied physics
Condensed matter physics
021001 nanoscience & nanotechnology
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
Magnetic field
Ferromagnetism
Condensed Matter::Strongly Correlated Electrons
0210 nano-technology
Subjects
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⟩