Magnetization reversal in TmCr1-xCoxO3 perovskite solid solutions studied by Monte Carlo simulations
Manuel E Vivas Arellano1, Elena Rufeil Fiori2,3, Juan M De Paoli1
1INFIQC (CONICET-UNC), Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de la Torre Esq. Medina Allende, Ciudad Universitaria, X5000HUA Córdoba, Argentina.
None:
In this work, we studied the magnetization reversal (MR) phenomenon in the perovskite solid solution TmCr1-xCoxO3, where magnetic Cr3+ ions were substituted by non-magnetic low-spin (LS) Co3+ ions. Magnetic measurements and Monte Carlo (MC) simulations were performed following a field-cooling (FC) protocol. Samples of TmCr1-xCoxO3 with 0.1 ≤ x ≤ 0.8 were synthesized and structurally characterized. Samples with 0.1 ≤ x < 0.5 were synthesized at 1200 °C in the air atmosphere, while those with 0.5 ≤ x ≤ 0.8 were synthesized at 1000 °C under high O2 pressure. A model was implemented to simulate the FC magnetization curves, taking into account the coupling between Tm3+ and Cr3+ ions. This model is based on a classical Heisenberg spin Hamiltonian with realistic interactions. We showed that it is possible to reproduce the MR phenomenon with MC simulations in perovskite oxides with magnetic rare earth and transition metal sublattices. MC simulations accurately described all the FC curves except for x = 0.6 because this composition is near the percolation threshold, where fluctuations in the distribution of Co3+ ions can alter the magnetic properties. Another explanation could be a possible spin reorientation of the Cr3+ ions sublattice that makes experimental magnetization depart from the predicted one. In addition, it was found that the antiferromagnetic superexchange interactions between Cr3+ ions increase with Co3+ content.
More Related Videos
Related Concept Videos
Ferromagnetism
Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
Atomic Nuclei: Nuclear Relaxation Processes
Magnetic Susceptibility and Permeability
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
Paramagnetism
Magnetostatic Boundary Conditions


