Magnetic interactions in vortex-state nanodisk arrays characterized by gradient magnetic vortex echo

Vigo-Cotrina H.; Urcia-Romero S.; P. Guimarães A. · Journal of Applied Physics (2024) · DOI: 10.1063/5.0194332

Resumen

Magnetic vortices have potential applications in the field of spintronics and medicine and studying their magnetic interactions is crucial for future applications. This work introduces a new method based on obtaining the gradient magnetic vortex echo (GMVE) using micromagnetic simulations following a magnetic resonance imaging protocol. The results show that it is possible to characterize the magnetic interaction of arrays of nanodisks, having equal diameter and vortex configuration, as a function of disk separation. This characterization was performed by creating an inhomogeneity in the system through the application of a magnetic field gradient perpendicular to the plane of the nanodisk array. The inhomogeneity allows refocusing the magnetization in a time-controlled way by inverting the sign of the gradient and obtaining the characteristic transverse relaxation time T 2 ? from the GMVE that contains the information on the magnetic interaction.

Instituciones: Universidad Privada del Norte