Title :
Chaotic oscillation of domain wall in non-equilibrium state
Author :
Okuno, Hikaru ; Homma, Takuya
Author_Institution :
Inst. of Eng. Mech., Tsukuba Univ., Ibaraki, Japan
fDate :
11/1/1993 12:00:00 AM
Abstract :
The nonlinear equation of the Bloch wall motion is presented by modifying the Slonczewski equation based on the Landau-Lifshitz-Gilbert equation. The nonlinear force of restitution caused by an internal stress and an eddy current damping are added. Computer simulation is performed using the fourth Runge-Kutta method. The amplitude of the domain wall oscillation in the frequency region from 50 kHz to 1 MHz is calculated and compared with the experimental values for a CoZrMo/SiO 2 multilayered core. The experimentally observed decrease of amplitude with increasing frequency is reproduced well. Using computer simulation the chaotic oscillation of a domain wall in an ideal potential well is shown to appear in spite of no randomness. Another chaotic oscillation of the domain wall with Barkhausen jumps from one potential to the neighbor is shown
Keywords :
chaos; cobalt alloys; ferromagnetic properties of substances; magnetic cores; magnetic domain walls; magnetic multilayers; molybdenum alloys; silicon compounds; zirconium alloys; 50 kHz to 1 MHz; Barkhausen jumps; Bloch wall motion; CoZrMo-SiO2; CoZrMo/SiO2 multilayered core; Landau-Lifshitz-Gilbert equation; Slonczewski equation; chaotic oscillation; computer simulation; domain wall oscillation; eddy current damping; fourth Runge-Kutta method; ideal potential well; internal stress; nonequilibrium state; nonlinear equation; nonlinear force of restitution; Chaos; Eddy currents; Energy loss; Frequency; Internal stresses; Magnetic domain walls; Magnetic materials; Magnetic resonance; Nonlinear dynamical systems; Nonlinear equations;
Journal_Title :
Magnetics, IEEE Transactions on
