Perpendicular magnetism facilitates an increase of the storage density by a factor 2-8 as compared to longitudinal recording. Besides the improved chemical and physical stability of Co Pt superstructures compared to RE-TM alloys, a perpendicular easy axis can be obtained by selecting a suitable Co Pt bilayer thickness ratio. For different repetition numbers n≤6 ab initio calculated Kerr angles are presented for (Co2 Pt6) n superstructures on Pt(111) with a 6 Pt layers thick cap in a photon energy range of 1-8 eV. The calculated maximum in the Kerr rotation angle occurs at an energy close to the experimentally observed value. Assuming an exponential decay of the gradient of θK with respect to n, an extrapolation of the calculated data to large n was performed in order to compare the obtained results to available experimental data.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Feb 27 2006|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics