Magnetism in two antiferromagnetic Ising nanoparticles under an applied transverse field.

• The two (A and B) Ising nanoparticles are investigated. • They are discussed by using the effective-field theory with correlations. • The phase diagrams and magnetizations are obtained. • Some characteristic phenomena, such as the reentrant phenomena and ferrimagnetic behaviors, are found. The phase diagrams and magnetization curves 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. The effects of size on the magnetic properties are discussed. Some characteristic features, such as the reentrant phenomena, are found in these properties of both systems, when a finite transverse field h is applied. The nanoparticle B exhibits the ferrimagnetic behaviors, such as a compensation point. [ABSTRACT FROM AUTHOR]