Ion beam modification of perpendicular magnetic anisotropy in (Co/Pt)n multilayers and FePt thin films

John Baglin; Charles Rettner; Bruce D. Terris; D. K. Weller; J.-U. Thiele; Andrew Kellock; Simone Anders; T. Thomson

doi:10.1117/12.452551

27 December 2001 Ion beam modification of perpendicular magnetic anisotropy in (Co/Pt)n multilayers and FePt thin films

John Baglin, Charles Rettner, Bruce D. Terris, D. K. Weller, J.-U. Thiele, Andrew Kellock, Simone Anders, T. Thomson

Proceedings Volume 4468, Engineering Thin Films with Ion Beams, Nanoscale Diagnostics, and Molecular Manufacturing; (2001) https://doi.org/10.1117/12.452551
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

For [Co(3 angstrom)/Pt(10 angstrom)]_n multilayers and FePt(111) L1₀ ordered films exposed to energetic ion beam irradiation, we have experimentally determined the dependence of the perpendicular coercivity on ion dose, for a variety of ion species and energies. A simple model based on ballistic displacement of Co (or Fe) atoms from ordered configurations is presented, which predicts an exponential decline of anisotropy with ion dose. The perpendicular coercivity for these samples is indeed found to decline in this way. The ballistic displacement model, evaluated using SRIM Monte Carlo simulation, roughly reflects the observed dependence on ion species and energy. However, the experimental data would demand a displacement probability per incident ion many times larger than that obtained from SRIM.

Citation Download Citation

John Baglin, Charles Rettner, Bruce D. Terris, D. K. Weller, J.-U. Thiele, Andrew Kellock, Simone Anders, and T. Thomson "Ion beam modification of perpendicular magnetic anisotropy in (Co/Pt)n multilayers and FePt thin films", Proc. SPIE 4468, Engineering Thin Films with Ion Beams, Nanoscale Diagnostics, and Molecular Manufacturing, (27 December 2001); https://doi.org/10.1117/12.452551

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