Phase diagram for ensembles of random close packed Ising-like dipoles as a function of texturation
arXiv:1909.13573 · doi:10.1103/PhysRevB.100.134409
Abstract
We study random close packed systems of magnetic spheres by Monte Carlo simulations in order to estimate their phase diagram. The uniaxial anisotropy of the spheres makes each of them behave as a single Ising dipole along a fixed easy axis. We explore the phase diagram in terms of the temperature and the degree of alignment (or texturation) among the easy axes of all spheres. This degree of alignment ranges from the textured case (all easy axes pointing along a common direction) to the non-textured case (randomly distributed easy axes). In the former case we find long-range ferromagnetic order at low temperature but, as the degree of alignment is diminished below a certain threshold, the ferromagnetic phase gives way to a spin-glass phase. This spin-glass phase is similar to the one previously found in other dipolar systems with strong frozen disorder. The transition between ferromagnetism and spin-glass passes through a narrow intermediate phase with quasi-long-range ferromagnetic order.
arXiv comment12 pages, 15 EPS figures, 1 table
References in corpus (22)
- Exchange Monte Carlo Method and Application to Spin Glass Simulations
- Simulated Tempering: A New Monte Carlo Scheme
- Artificial "spin ice" in a geometrically frustrated lattice of nanoscale ferromagnetic islands
- Jammed Hard-Particle Packings: From Kepler to Bernal and Beyond
- Packing Hyperspheres in High-Dimensional Euclidean Spaces
- Critical Behavior of the Three-Dimensional Ising Spin Glass
- Estimate of the Cutoff Errors in the Ewald Summation for Dipolar Systems
- Critical dynamics in the 2d classical XY-model: a spin dynamics study
- Ordering of dipolar Ising crystals
- Orientational Ordering in Spatially Disordered Dipolar Systems
- Finite size corrections in the Sherrington-Kirkpatrick model
- Ferroelectric and Dipolar Glass Phases of Non-Crystalline Systems
- Monte Carlo study of the spin-glass phase of the site-diluted dipolar Ising model
- Blocking temperature of interacting magnetic nanoparticles with uniaxial and cubic anisotropies from Monte Carlo simulations
- Magnetization of densely packed interacting magnetic nanoparticles with cubic and uniaxial anisotropies: A Monte Carlo study
- Dynamic Correlation Length Growth in Superspin Glass: Bridging Experiments and Simulations
- Equilibrium spin-glass transition of magnetic dipoles with random anisotropy axes
- Equilibrium spin-glass transition of magnetic dipoles with random anisotropy axes on a site diluted lattice
- Anisotropy-axis orientation effect on the magnetization of γ-Fe2O3 frozen ferrofluid
- Low-temperature spin-glass behaviour in a diluted dipolar Ising system
- Nature of the spin-glass phase in dense packings of Ising dipoles with random anisotropy axes
- Effect of weak disorder on the ground state of uniaxial dipolar spin systems in the upper critical dimension
Cited by in corpus (6)
- Simultaneous individual and dipolar collective properties in binary assemblies of magnetic nanoparticles
- Phase diagram of a three-dimensional dipolar model on a FCC lattice
- Phase diagram of a three-dimensional dipolar Ising model with textured Ising axes
- Magnetic ordering of random dense packings of freely rotating dipoles
- Ferromagnetic frozen structures from the dipolar hard spheres fluid at moderate and small volume fractions
- Role of positional disorder in fully textured ensembles of Ising-like dipoles