Compensation behavior of a ferrimagnetic nanoparticle system with binary alloy shell

• Magnetic properties of a nanoparticle with binary alloy shell are examined by the Monte Carlo simulation.
• The effect of the antiferromagnetic shell coupling on the magnetic properties is studied.
• One, two or even three compensations points are obtained.
• The dependence of the magnetization and susceptibility on the temperature are investigated.

The phase diagrams and the magnetic properties of a spherical ferrimagnetic nanoparticle, consisting of a ferromagnetic core of atoms A   with spin-1/2 (SA=1/2)(SA=1/2) surrounded by a disordered ferrimagnetic binary alloy shell of two kinds of atoms (A and B  ) with different spins (SA=1/2SA=1/2 and SB=3/2SB=3/2) are studied by using Monte Carlo simulation based on the Metropolis algorithm. Depending on the values of the Hamiltonian parameters, the system presents a number of outstanding phenomena, such as the possibility of one, two or even three compensation point(s). The existence of a compensation temperature is an interesting phenomenon with important technological applications in the field of thermomagnetic recording.