Dynamic phase transition properties and hysteretic behavior of a ferrimagnetic core-shell nanoparticle in the presence of a time dependent magnetic field

Abstract

We have presented dynamic phase transition features and stationary-state behavior of a ferrimagnetic small nanoparticle system with a core-shell structure. By means of detailed Monte Carlo simulations, a complete picture of the phase diagrams and magnetization profiles have been presented and the conditions for the occurrence of a compensation point $T_{comp}$ in the system have been investigated. According to Néel nomenclature, the magnetization curves of the particle have been found to obey P-type, N-type and Q-type classification schemes under certain conditions. Much effort has been devoted to investigation of hysteretic response of the particle and we observed the existence of triple hysteresis loop behavior which originates from the existence of a weak ferromagnetic core coupling $J_c/J_{sh}$, as well as a strong antiferromagnetic interface exchange interaction $J_{int}/J_{sh}$. Most of the calculations have been performed for a particle in the presence of oscillating fields of very high frequencies and high amplitudes in comparison with exchange interactions which resembles a magnetic system under the influence of ultrafast switching fields. Particular attention has also been paid on the influence of the particle size on the thermal and magnetic properties, as well as magnetic features such as coercivity, remanence and compensation temperature of the particle. We have found that in the presence of ultrafast switching fields, the particle may exhibit a dynamic phase transition from paramagnetic to a dynamically ordered phase with increasing ferromagnetic shell thickness.

12 pages, 12 figures

References in corpus (14)

• Dynamic transitions and hysteresis
• Surface contribution to the anisotropy of magnetic nanoparticles
• Monte Carlo simulation with time step quantification in terms of Langevin dynamics
• Microscopic origin of exchange bias in core/shell nanoparticles
• Exact results of a mixed spin-1/2 and spin-S Ising model on a bathroom tile (4-8) lattice: effect of uniaxial single-ion anisotropy
• Nonequilibrium Phase Transition in the Kinetic Ising model: Critical Slowing Down and Specific-heat Singularity
• Magnetization Switching in Nanowires: Monte Carlo Study with Fast Fourier Transformation for Dipolar Fields
• Evidence of Ferrimagnetism in Ferromagnetic La0_{67}Ca0_{33}MnO_3 nanoparticle
• Local control of ultrafast dynamics in magnetic nanoparticles
• Magnetic Behavior of a Mixed Ising Ferrimagnetic Model in an Oscillating Magnetic Field
• Reentrant phase transitions and multicompensation points in the mixed-spin Ising ferrimagnet on a decorated Bethe lattice
• Time Quantified Monte Carlo Algorithm for Interacting Spin Array Micromagnetic Dynamics
• A new time quantifiable Monte Carlo method in simulating magnetization reversal process
• Simulation of Magnetization Switching in Nanoparticle Systems

Cited by in corpus (13)

• Dynamic behaviors of the hexagonal Ising nanowire
• Monte Carlo investigation of a spherical ferrimagnetic core-shell nanoparticle under a time dependent magnetic field
• Cylindrical Ising Nanowire in an Oscillating Magnetic Field and Dynamic Compensation Temperature
• Dynamic phase transition of the Blume-Capel model in an oscillating magnetic field
• Magnetic properties and phase diagrams of mixed spin-1 and spin-1/2 Ising model on a checkerboard square structure: A Monte Carlo study
• Dynamic phase transitions in the presence of quenched randomness
• Monte Carlo simulations of dynamic phase transitions in ultrathin Blume-Capel films
• Monte Carlo study of the two-dimensional kinetic Blume-Capel model in a quenched random crystal field
• Dynamic phase transitions on the kagome Ising ferromagnet
• Magnetic response of a disordered binary ferromagnetic alloy to an oscillating magnetic field
• Qualitative aspects of the phase diagram of J1-J2 model on the cubic lattice
• Nonequilibrium Multiple Transitions in the Core-shell Ising Nanoparticles Driven by Randomly Varying Magnetic Fields
• Dynamic phase transitions in a ferromagnetic thin film system: A Monte Carlo simulation study