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Article Dans Une Revue Applied Physics Letters Année : 2009

Coercivity tuning in Co/Pd multilayer based bit patterned media

Résumé

In order to adjust the reversal field of high anisotropy ͓Co2.8 Å͒ / Pd9 Å͔͒ 8 bit patterned media (BPM), one may increase the individual Co thickness to change the overall anisotropy or alternatively combine the high anisotropy multilayer with a lower anisotropy material, thus creating a heterogeneous laminated system. In the current study, we find that ͓Co/ Pd͔ 8−N ͓Co/ Ni͔ N hard-soft laminated BPM allows tuning the coercivity while maintaining a narrow normalized switching field distribution SFD / HC, whereas homogeneous structures with increased individual Co thickness show a more pronounced increase in SFD / HC. Possible reasons for the different behavior, such as changes in strain and texture, are discussed. Magnetron sputtered ͓Co/Pd͔ and ͓Co/Pt͔ multilayers (ML) are model material systems for bit patterned media BPM due to their controllable magnetic properties. Deposition parameters, such as individual Co and Pd layer thicknesses, number of repeats, sputter pressure, and temperature allow good control over magnetic properties including anisotropy, saturation magnetization, coercivity, and magnetic microstructure. One crucial issue for the implementation of BPM is to control the switching field and the switching field distribution SFD in order to ensure addres-sability of the predefined bits without overwriting adjacent down-or cross-track bits.
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hal-01345323 , version 1 (13-07-2016)

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O Hellwig, Thomas Hauet, T Thomson, E Dobisz, D. Risner-Jamtgaard, et al.. Coercivity tuning in Co/Pd multilayer based bit patterned media. Applied Physics Letters, 2009, ⟨10.1063/1.3271679͔⟩. ⟨hal-01345323⟩
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