Micromagnetic simulation of two-body magnetic nanoparticles

National Conference on Theory of Magnetism

Li, Fei^1 ; Lu, Jincheng^1 ; Yang, Yu^1 ; Lu, Xiaofeng^1 ; Tang, Rujun^1,2 ; Sun, Z.Z.^1,2

College of Physics, Optoelectronics and Energy, Soochow University, Suzhou, JIANGSU

215006, China^1

Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou, JIANGSU

215006, China^2

关键词: Dipolar interaction;    Low power application;    Magnetic nano-particles;    Magnetostatic interactions;    Micromagnetic simulations;    Separation distances;    Single domain magnetic particles;    Uniaxial anisotropy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/827/1/012004/pdf
DOI  :  10.1088/1742-6596/827/1/012004

来源: IOP

【 摘 要 】

Field-induced magnetization dynamics was investigated in a system of two magnetic nanoparticles with uniaxial anisotropies and magnetostatic interaction. By using the micromagnetic simulation, ultralow switching field strength was found when the separation distance between the two particles reaches a critical small value on nanometer scale in the perpendicular configuration where the anisotropic axes of the two particles are perpendicular to the separation line. The switching field increases sharply when the separation is away from the critical distance. The same results were observed when varying the radius of particles. The micromagnetic results are consistent with the previous theoretical prediction where dipolar interaction between two single-domain magnetic particles was considered. Our present simulations offered further proofs and possibilities for the low-power applications of information storage as the two-body magnetic nanoparticles could be implemented as a composite information bit.