Implementation of the "hyperdynamics of infrequent events" method for acceleration of thermal switching dynamics of magnetic moments

• Published in: IEEE transactions on magnetics Vol. 40; no. 4; pp. 2140 - 2142
• Main Authors: Chubykalo-Fesenko, O.A., Sanchez, F.G., Chantrell, R.W.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.07.2004; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Acceleration; Anisotropic magnetoresistance; Chemicals; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Damping; Eigenvalues and eigenfunctions; Exact sciences and technology; Magnetic anisotropy; Magnetic moments; Magnetic properties and materials; Magnetic switching; Magnetism; Perpendicular magnetic anisotropy; Physics; numerical methods; spin dynamics and relaxation; Magnetic materials; Computational magnetics
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2004.830397

For acceleration of the calculations of thermal magnetic switching, we report the use of the Voter method, recently proposed in chemical physics (also called "hyperdynamics of the infrequent events"). The method consists of modification of the magnetic potential so that the transition state remains unchanged. We have found that the method correctly describes the mean first passage time even in the case of small damping (precessional case) and for an oblique angle between the anisotropy and the field directions. Due to the costly evaluation of the lowest energy eigenvalue, the actual acceleration depends on its fast computation. In the current implementation, it is limited to intermediate time scale and to small system size.