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Proceedings Paper

Ion beam modification of perpendicular magnetic anisotropy in (Co/Pt)n multilayers and FePt thin films
Author(s): John Baglin; Charles Rettner; Bruce D. Terris; D. K. Weller; J.-U. Thiele; Andrew Kellock; Simone Anders; T. Thomson
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Paper 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.

Paper Details

Date Published: 27 December 2001
PDF: 7 pages
Proc. SPIE 4468, Engineering Thin Films with Ion Beams, Nanoscale Diagnostics, and Molecular Manufacturing, (27 December 2001); doi: 10.1117/12.452551
Show Author Affiliations
John Baglin, IBM Almaden Research Ctr. (United States)
Charles Rettner, IBM Almaden Research Ctr. (United States)
Bruce D. Terris, IBM Almaden Research Ctr. (United States)
D. K. Weller, IBM Almaden Research Ctr. (United States)
J.-U. Thiele, IBM Almaden Research Ctr. (United States)
Andrew Kellock, IBM Almaden Research Ctr. (United States)
Simone Anders, IBM Almaden Research Ctr. (United States)
T. Thomson, IBM Almaden Research Ctr. (United States)


Published in SPIE Proceedings Vol. 4468:
Engineering Thin Films with Ion Beams, Nanoscale Diagnostics, and Molecular Manufacturing
Emile J. Knystautas; Wiley P. Kirk; Valerie Browning, Editor(s)

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