Eur. Phys. J. Appl. Phys.
Volume 38, Number 3, June 2007
|Page(s)||253 - 258|
|Section||Magnetism and Superconductivity|
|Published online||30 May 2007|
Effect of N+ irradiation on the microstructural and magnetic properties of Co/Pd multilayers
ISM – CNR, Area della Ricerca di Roma, P.B. 10, 00016 Monterotondo Stazione, Rome, Italy
2 Instituto de Microelectrónica de Madrid, IMM (CNM-CSIC) C/Isaac Newton, 8 (PTM) 28760 - Tres Cantos, Madrid, Spain
3 Institut de Microelectrònica Barcelona, Campus Universitat Autònoma Barcelona, 08193, Bellaterra, Spain
4 UNAXIS Data Storage, 9496 Balzers, Liechtenstein
Corresponding author: email@example.com
Accepted: 23 March 2007
Published online: 30 May 2007
Microstructural and magnetic properties of 14N+ irradiated Co/Pd multilayers, deposited on ultra-flat large (2.5 in) glass substrates by a special hard disk industrial manufacturing system, are discussed. Upon irradiation with 14N+ ions at different energies (20–30 keV) and doses (1014–1015 ions/cm2), both the coercive and nucleation fields were found to change with respect to as deposited multilayer. Results indicate that the irradiation process leads to a lowering of the magnetic anisotropy due to the induced disorder and degradation of the interface quality: for an energy of 30 keV, at an irradiation level of 1015 ions/cm2, Hc reduces from Hc ≈ 5.4 kOe for the as deposited multilayer down to 300 Oe, being the easy axis still perpendicular to the multilayer plane; at the highest dose (1016 ions/cm2), the coercivity vanishes and the perpendicular anisotropy is suppressed.
PACS: 75.50.Ss – Magnetic recording materials / 75.70.Cn – Magnetic properties of interfaces (multilayers, superlattices, heterostructures) / 75.60.Jk – Magnetization reversal mechanisms
© EDP Sciences, 2007
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