Abstract
The phase diagrams and magnetizations of two antiferromagnetic Ising nanoparticles (A and B) under an applied transverse field are investigated by using the effective-field theory with correlations. The nanoparticle B is a size larger than that of nanoparticle A. Both nanoparticles exhibit the reentrant phenomena. The numerical results show that the magnetic properties in the nanoparticle may exhibit rather different behaviors, depending on the size of a nanoparticle.
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