Origin of perpendicular magnetic anisotropy in Co/Ni multilayers
- Author(s)
- Monika Arora, René Hübner, Dieter Süss, Bret Heinrich, Erol Girt
- Abstract
We studied the variation in perpendicular magnetic anisotropy of (111) textured Au/N×[Co/Ni]/Au films as a function of the number of bilayer repeats N. The ferromagnetic resonance and superconducting quantum interference device magnetometer measurements show that the perpendicular magnetic anisotropy of Co/Ni multilayers first increases with N for N≤10 and then moderately decreases for N>10. The model we propose reveals that the decrease of the anisotropy for N<10 is predominantly due to the reduction in the magnetoelastic and magnetocrystalline anisotropies. A moderate decrease in the perpendicular magnetic anisotropy for N>10 is due to the reduction in the magnetocrystalline and the surface anisotropies. To calculate the contribution of magnetoelastic anisotropy in the Co/Ni multilayers, in-plane and out-of-plane x-ray diffraction measurements are performed to determine the spacing between Co/Ni (111) and (220) planes. The magnetocrystalline bulk anisotropy is estimated from the difference in the perpendicular and parallel g factors of Co/Ni multilayers that are measured using the in-plane and out-of-plane ferromagnetic resonance measurements. Transmission electron microscopy has been used to estimate the multilayer film roughness. These values are used to calculate the roughness-induced surface and magnetocrystalline anisotropy coefficients as a function of N.
- Organisation(s)
- Physics of Functional Materials
- External organisation(s)
- Simon Fraser University, Helmholtz-Zentrum Dresden-Rossendorf
- Journal
- Physical Review B
- Volume
- 96
- No. of pages
- 13
- ISSN
- 2469-9950
- DOI
- https://doi.org/10.1103/PhysRevB.96.024401
- Publication date
- 07-2017
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 205004 Functional materials
- Keywords
- ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials, Condensed Matter Physics
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/origin-of-perpendicular-magnetic-anisotropy-in-coni-multilayers(77446650-534d-4d6a-bce2-50c4d0526ac5).html