Directional dependence of vortex core resonance in a square-shaped ferromagnetic dot

Chirality-mediated bistability and strong frequency downshifting of the gyrotropic resonance of a magnetic vortex due to dynamic destiffening

“…we can both significantly increase and decrease f G relative to its value for a non-displaced vortex in zero field). We note that frequency downshifting has also been observed in square ferromagnetic elements 35,36 and, to a lesser degree, in triangular elements 37 when moving the core towards a flat edge within the element.…”

Tunable Angle-Dependent Magnetization Dynamics in Ni80Fe20 Nanocross Structures of Varying Size

“…On the other hand, due to the progress of nanolithography [3], patterned nanostructures and their arrays have been emerged as systems having great potential applications such as magnetic data storage [4,5], memory [6], logic devices [7] and spin torque nano-oscillators [8]. In nanodot arrays [9], the high surface to volume ratio, inhomogeneous demagnetizing field, dipole-dipole [10,11] interaction between the nanodots have significant effects on their magnetic properties and can lead to complex spin configuration within a single nanomagnet [12,13] and arrays of nanomagnets [14][15][16][17][18][19][20].…”

“…These complex spin configurations lead to rich variety of SW modes which have strong dependence on the strength [15] and orientation [16,17] of the applied bias magnetic field, and on the shape [18][19][20] and size [9,33] of nano-elements. Extensive research works have been carried out to investigate the magnetization dynamics in two dimensional (2-D) arrays of nanomagnets both experimentally using time-resolved scanning Kerr microscopy (TRSKM) [21] or time-resolved magneto-optical Kerr effect (TR-MOKE) microscopy [22], ferromagnetic resonance (FMR) [23][24][25], and Brillouin light scattering (BLS) [26,27]; and theoretically by micromagnetic simulations [28] and other numerical and analytical methods.…”