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Modification of Co/Pt multilayers by gallium irradiation - Part 1: The effect on structural and magnetic properties

By R. Hyndman, P. Warin, J. Gierak, J. Ferre, J.N. Chapman, J.P. Jamet, V. Mathet and C. Chappert

Abstract

Atomic force microscopy, transmission electron microscopy, optical, and magneto-optical microscopy have been used to study how structural and magnetic properties are changed when a Co/Pt multilayer is quasihomogeneously irradiated with Ga ions. Under low irradiation fluence, both grain size and texture in the multilayer increase. These effects continue for fluences in excess of 1 x 10(15) Ga ions/cm(2), but beyond this dose significant thinning of the multilayer is also observed. Three distinct irradiation-induced magnetic regimes with sharp transitions between each were identified. For Ga fluences less than 5 x 10(12) ions/cm(2), the irradiated region retains perpendicular uniaxial anisotropy but with coercivity lower than that of the as-grown film. For fluences between 5 x 10(12) and 1 x 10(13) Ga ions/cm(2), a transition from perpendicular to in-plane magnetization was experienced. Very little change of the in-plane magnetic properties of irradiated multilayers is then observed until the sample experiences a ferromagnetic to paramagnetic transition at fluences around 1 x 10(15) Ga ions/cm(2). A brief comparison with the effect of irradiating with He ions is given

Topics: QC
Year: 2001
DOI identifier: 10.1063/1.1401803
OAI identifier: oai:eprints.gla.ac.uk:1601
Provided by: Enlighten
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