Ion induced magnetization reorientation in Co/Pt multilayers for patterned media

Journal Article · Sat Jan 01 04:00:00 EST 2000 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.372516· OSTI ID:787094

Weller, D ^[1]; Baglin, J E.E.; Kellock, A J; Hannibal, K A; Toney, M F; Kusinski, G; Lang, S; Best, M E; Terris, B D

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1. LBNL Library

Co/Pt multilayer films with perpendicular magnetic anisotropy and large out-of-plane coercivities of 3.9 - 8.5 kOe have been found to undergo a spin reorientation transition from out-of-plane to in-plane upon irradiation with 700 keV nitrogen ions. X-ray reflectivity experiments show that the multilayer structure gets progressively disrupted with increasing ion dose, providing direct evidence for local atomic displacements at the Co/Pt interfaces. This effectively destroys the magnetic interface anisotropy, which was varied by about a factor of two, between KS@ 0.4 erg/cm2 and KS@ 0.85 erg/cm2 for two particular films. The dose required to initiate spin-reorientation, 6x1014 N+/cm2 and 1.5x1015 N+/cm2, respectively, scales with KS. It is roughly equal to the number of Co interface atoms per unit interface area contributing to KS.

• Research Organization: Lawrence Berkeley National Lab., CA (US)
• Sponsoring Organization: USDOE Director, Office of Science. Office of Basic Energy Studies. Division of Materials Sciences (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 787094
• Report Number(s): LBNL--46726
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 9 PT2 Vol. 87; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
ATOMIC DISPLACEMENTS
COBALT
ION BEAMS
ION IRRADIATION MAGNETIC PROPERTIES PATTERNED MEDIA SPIN REORIENTATION
IRRADIATION
MAGNETIZATION
NITROGEN IONS
ORIENTATION
PLATINUM
REFLECTIVITY
SPIN