title: Tunable magnetism on the lateral mesoscale by post-processing of Co/Pt heterostructures.
abstract: Controlling magnetic properties on the nanometer-scale is essential for basic research in micro-magnetism and spin-dependent transport, as well as for various applications such as magnetic recording, imaging and sensing. This has been accomplished to a very high degree by means of layered heterostructures in the vertical dimension. Here we present a complementary approach that allows for a controlled tuning of the magnetic properties of Co/Pt heterostructures on the lateral mesoscale. By means of in situ post-processing of Pt- and Co-based nano-stripes prepared by focused electron beam induced deposition (FEBID) we are able to locally tune their coercive field and remanent magnetization. Whereas single Co-FEBID nano-stripes show no hysteresis, we find hard-magnetic behavior for post-processed Co/Pt nano-stripes with coercive fields up to 850 Oe. We attribute the observed effects to the locally controlled formation of the CoPt L10 phase, whose presence has been revealed by transmission electron microscopy.
authors.affiliation: Physikalisches Institut, Goethe University, 60438 Frankfurt am Main, Germany ; Physics Department, V. Karazin Kharkiv National University, 61077 Kharkiv, Ukraine.
authors.forename: Oleksandr V
authors.initials: OV
authors.lastname: Dobrovolskiy
authors.affiliation: Physikalisches Institut, Goethe University, 60438 Frankfurt am Main, Germany.
authors.forename: Maksym
authors.initials: M
authors.lastname: Kompaniiets
authors.affiliation: Physikalisches Institut, Goethe University, 60438 Frankfurt am Main, Germany.
authors.forename: Roland
authors.initials: R
authors.lastname: Sachser
authors.affiliation: Physikalisches Institut, Goethe University, 60438 Frankfurt am Main, Germany.
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Porrati
authors.affiliation: Graz Centre for Electron Microscopy, 8010 Graz, Austria.
authors.forename: Christian
authors.initials: C
authors.lastname: Gspan
authors.affiliation: Graz Centre for Electron Microscopy, 8010 Graz, Austria ; Institute for Electron Microscopy and Nanoanalysis, TU Graz, 8010 Graz, Austria.
authors.forename: Harald
authors.initials: H
authors.lastname: Plank
authors.affiliation: Physikalisches Institut, Goethe University, 60438 Frankfurt am Main, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Huth
keywords: cobalt; focused electron beam induced deposition; heterostructures; in situ processing; platinum