Abstract
Exchange coupled ferri-/ferromagnetic heterostructures are a possible material composition for future magnetic storage and sensor applications. In order to understand the driving mechanisms in the demagnetization process, we perform micromagnetic simulations by employing the Landau–Lifshitz–Gilbert equation. The magnetization reversal is dominated by pinning events within the amorphous ferrimagnetic layer and at the interface between the ferrimagnetic and the ferromagnetic layer. The shape of the computed magnetization reversal loop corresponds well with experimental data, if a spatial variation of the exchange coupling across the ferri-/ferromagnetic interface is assumed.
Highlights
Ferrimagnetic materials have been widely used as magnetooptical recording media [1,2] and provide great potential for future devices in sensor technology and magnetic recording
Interest in ferrimagnetic materials has been renewed by experiments revealing all-optical switching of the magnetization [3,4,5] and the building of heterostructures leading to giant exchange bias [6]
Exchange coupled composites (ECC) of hard- and soft-magnetic phases have already been proposed for the generation of magnetic recording media [8] and may very well benefit even more from tailored ferrimagnetic layers
Summary
Ferrimagnetic materials have been widely used as magnetooptical recording media [1,2] and provide great potential for future devices in sensor technology and magnetic recording. Ferrimagnetic thin films have been extensively studied by Giles and Mansuripur et al [9,10,11,12] in terms of magneto-optical recording In their work they investigated the magnetization reversal dynamics and domain wall motion by utilizing an adapted Gilbert equation on a two dimensional lattice of magnetic dipoles. The effect of media dimensions and interface exchange on magnetization at remanent and coercive states for two layers separated by a nonmagnetic phase were investigated Both layers are modelled as an array of uniaxial volume elements and show an isotropic three-dimensional distribution of magnetocrystalline anisotropy axes. Schubert and collaborators [17] experimentally investigated the interface exchange coupling of ferri-/ferromagnetic heterostructures with out-of-plane anisotropy Their results revealed that an interfacial domain wall greatly affects the demagnetization process. The demagnetization process is studied by visualizing and comparing the movement of domain walls through a single ferrimagnetic layer and a ferri-/ ferromagnetic bilayer system
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