Micromagnetic simulation of exchange coupled ferri-/ferromagnetic composite in bit patterned media

• DOI: 10.1063/1.4906288
• Publication Date: 2015-01-16T18:00:26Z
• Authors: Harald Oezelt; Alexander Kovacs; Phillip Wohlhüter; Eugenie Kirk; Dennis Nissen; Patrick Matthes; Laura Jane Heyderman; Manfred Albrecht; Thomas Schrefl
• Keywords: Ferrimagnetism; Micromagnetics; Patterned media; Exchange interaction

Ferri-/ferromagnetic exchange coupled composites are promising candidates for bit patterned media because of the ability to control magnetic properties ferrimagnet by its composition. A micromagnetic model bilayer system is presented where we also incorporate microstructural features both layers. Micromagnetic finite element simulations performed investigate magnetization reversal behaviour such media. By adding ferromagnet, switching field could be reduced up 40% and distribution narrowed. To reach these significant improvements, an interface coupling strength 2 mJ/m2 required.