Magnetization processes in core/shell exchange-spring structures.

Conference · Fri Mar 27 00:00:00 EDT 2015

DOI:https://doi.org/10.1063/1.4916543· OSTI ID:1357176

Jiang, J. S.

The magnetization reversal processes in cylindrical and spherical soft core/hard shell exchange-spring structures are investigated via the analytical nucleation theory, and are verified with numerical micromagnetic simulations. At small core sizes, the nucleation of magnetic reversal proceeds via the modified bulging mode, where the transverse component of the magnetization is only semi-coherent in direction and the nucleation field contains a contribution from self-demagnetization. For large core sizes, the modified curling mode, where the magnetization configuration is vortex-like, is favored at nucleation. The preference for the modified curling mode is beneficial in that the fluxclosure allows cylindrical and spherical core/shell exchange-spring elements to be densely packed into bulk permanent magnets without affecting the nucleation field, thereby offering the potential for high energy product.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1357176
• Resource Relation: Conference: 59th Annual Magnetism and Magnetic Materials Conference, 11/03/14 - 11/07/14, Honolulu, HA
• Country of Publication: United States
• Language: English