Engineered magnetization and exchange stiffness in direct-write Co-Fe nanoelements

Autor(en)

S. A. Bunyaev, B. Budinska, R. Sachser, Q. Wang, K. Levchenko, S. Knauer, A. V. Bondarenko, M. Urbánek, K. Y. Guslienko, A. V. Chumak, M. Huth, G. N. Kakazei, O. V. Dobrovolskiy

Abstrakt

Media with engineered magnetization are essential building blocks in magnonics, spintronics, and superconductivity. However, the established thin film and lithographic techniques insufficiently suit the realization of planar components with on-demand-tailored magnetization in the lateral dimension. Here, we demonstrate the engineering of the magnetic properties of CoFe-based nanodisks fabricated by the mask-less technique of focused electron beam-induced deposition (FEBID). The material composition in the nanodisks is tuned in situ via the e-beam waiting time in the FEBID process and their post-growth irradiation with Ga ions. The saturation magnetization Ms and exchange stiffness A of the disks are deduced from perpendicular spin-wave resonance measurements. The achieved Ms variation in the broad range from 720 emu/cm3 to 1430 emu/cm3 continuously bridges the gap between the Ms values of widely used magnonic materials such as Permalloy and CoFeB. The presented approach paves the way toward nanoscale 2D and 3D systems with controllable space-varied magnetic properties.

Organisation(en)

Nanomagnetismus und Magnonik

Externe Organisation(en)

Universidade do Porto, Johann Wolfgang Goethe-Universität Frankfurt am Main, Brno University of Technology, University of the Basque Country, Ikerbasque Basque Foundation for Science

Journal

Applied Physics Letters

Band

118

Anzahl der Seiten

5

ISSN

0003-6951

DOI

https://doi.org/10.1063/5.0036361

Publikationsdatum

01-2021

Peer-reviewed

Ja

ÖFOS 2012

103017 Magnetismus, 210006 Nanotechnologie

ASJC Scopus Sachgebiete

Physics and Astronomy (miscellaneous)

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/02ca7f6f-64dd-4a43-8362-905d672c7b33