Soft X-ray magnetic scattering as a probe of recording media
Eric E. Fullerton, O. Hellwig, et al.
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
We present results on the magnetic reversal process in epitaxial Sm-Co(1100)/TM (TM=Fe, Co) bilayer films prepared via magnetron sputtering onto Cr-buffered single-crystal MgO substrates. The magnetically hard Sm-Co films have 20 T uniaxial anisotropy and coercivities >3 T at room temperature. The magnetization of the soft layer is pinned at the interface to the hard-magnet layer and switches reversibly as expected for an exchange-spring magnet. With increasing soft layer thickness, the coercive field of the hard layer becomes significantly less than that of a single layer. We also present numerical solutions to a one-dimensional model that provide the spin configuration for each atomic layer. Comparison of the experimental results with the model simulations indicates that the exchange-spring behavior of our bilayer films can be understood from the intrinsic parameters of the hard and soft layers. © 1998 American Institute of Physics.
Eric E. Fullerton, O. Hellwig, et al.
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
A.P. Malozemoff, M. Grimsditch, et al.
Journal of Applied Physics
M. Grimsditch, W. Senn, et al.
Solid State Communications
S. Maat, O. Hellwig, et al.
Physical Review B - CMMP