Magnetic nano-grains from a non-magnetic material: a possible explanation

2nd International Conference on Competitive Materials and Technological Processes

Kovács, Endre^1 ; Trencsényi, Réka^2 ; Gulácsi, Zsolt^2

Department of Physics, University of Miskolc, Miskolc, Hungary^1

Department of Theoretical Physics, University of Debrecen, Debrecen, Hungary^2

关键词: Ferromagnetic behaviors;    Ground state solutions;    Metallic material;    Non-magnetic materials;    Nonmagnetics;    Periodic boundary conditions;    Positive semidefinite;    Small samples;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/47/1/012048/pdf
DOI  :  10.1088/1757-899X/47/1/012048

来源: IOP

【 摘 要 】

Based on positive semidefinite operator properties, an exact ground state solution is deduced for a 2D Hubbard model with periodic boundary conditions on small samples. The obtained ferromagnetic behavior is used as a possible explanation of the ferromagnetism occurring in nano-samples made of non-magnetic but metallic materials.