Magnetic and thermodynamic properties of nanodisks by Monte Carlo simulations

2nd International Conference on Mathematical Modeling in Physical Sciences 2013

物理学;数学

Konstantinova, Elena^1 ; De Sales, José Antonio^1

Departamento de Educação e Ciências, Instituto Federal de Sudeste de Minas Gerais (IF Sudeste MG), Campus Juiz de for A, 36080-001, Juiz de Fora, MG, Brazil^1

关键词: Body-centered cubic;    Correlation constants;    Critical temperatures;    Crystalline structure;    Geometric sizes;    Heisenberg models;    Theoretical research;    Theoretical study;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/490/1/012164/pdf
DOI  :  10.1088/1742-6596/490/1/012164

来源: IOP

【 摘 要 】

The idea that the properties of nano materials depend on their crystalline structure and the form and geometric sizes of them is discussed in this paper. The progress in the growth area of nano magnetic devices attracts the interest from both experimental and theoretical study of the nano structures for potential applications in industry. In various fields of electronics there is need to have nano materials with a wide range of magnetic properties. In this case theoretical research could provide a way to get the nano compounds with the required characteristics. In this paper we present the results of Monte Carlo simulations of magnetic nanodisks, which are based on simple cubic and body-centered cubic unit cell. The magnetization of spin, magnetic susceptibility and specific heat are investigated for nanodisks with the different diameters, thicknesses and for different values of the ratio of the correlation constants. The combination of dipolar and Heisenberg model interaction are considered for ferromagnetic case and are show that the magnetic and thermodynamic properties of the nanostructures are strongly dependent on their geometry. The structures with body-centered cubic unit cell demonstrate stronger dependences on the thickness of the disks and also higher critical temperature and wider hysteresis loop.