Critical magnetization and hysteresis of nanogranular films with perpendicular anisotropy

• Published in: Journal of experimental and theoretical physics Vol. 118; no. 2; pp. 284 - 296
• Main Authors: Ryabchenko, S. M., Kalita, V. M.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-02-2014; Springer
• Subjects: Analysis; Anisotropy; Classical and Quantum Gravitation; Disorder; Elementary Particles; Magnetic fields; Magnetization; Order; Particle and Nuclear Physics; Phase Transition in Condensed System; Physics; Physics and Astronomy; Quantum Field Theory; Relativity Theory; Solid State Physics; Field Dependence; Magnetic Field Dependence; Anisotropy Field; Nonequilibrium State; Stability Boundary
• ISSN: 1063-7761; 1090-6509
• DOI: 10.1134/S1063776114020058

The magnetic-field dependences of the stability boundaries of the nonequilibrium magnetic states that exist in a nanogranular film with perpendicular anisotropy in tilted magnetic fields are theoretically described, and the corresponding critical magnetization is calculated. The field dependences of the critical magnetization of the film are analyzed at various ratios of the anisotropy field of particles to the maximum possible demagnetizing field of the film. In a tilted magnetic field, the magnetization reversal curves, which include hysteresis loops, are shown to consist of segments of the following three types: equilibrium stable magnetization, nonequilibrium stable magnetization, and critical type of magnetization.