Large-area nanopillar arrays by glancing angle deposition with tailored magnetic properties

© 2022 by the authors. Licensee MDPI, This research was funded by MINECO (MAT2014-59772-C2-1-P and FIS2016-76058). We also thank the service from the MiNa Laboratory at IMN funded by Comunidad de Madrid (project S2018/NMT-4291TEC2SPACE), Comunidad de Madrid NANOMAGCOST S2018/NMT-4321, MINECO (CSIC13-4E-1794) and the EU (FEDER, FSE). In Chile we acknowledge the financial support from Redes (190158), Basal Project (AFB180001), Fondecyt 1200302, ANID-PFCHA/PostdoctoradoBecas Chile 74200122 and Dicyt-Usach 041931EM_POSTDOC. The Brazilian funding arises from São Paulo Research Foundation: 2017/10581-1 and 2020/07397-7; National Council for S.
Ferromagnetic films down to thicknesses of tens of nanometers and composed by polycrystalline Fe and Fe2O3 nanopillars are grown in large areas by glancing angle deposition with magnetron sputtering (MS-GLAD). The morphological features of these films strongly depend on the growth conditions. Vertical or tilted nanopillars have been fabricated depending on whether the substrate is kept rotating azimuthally during deposition or not, respectively. The magnetic properties of these nanopillars films, such as hysteresis loops squareness, adjustable switching fields, magnetic anisotropy and coercivity, can be tuned with the specific morphology. In particular, the growth performed through a collimator mask mounted onto a not rotating azimuthally substrate produces almost isolated well-defined tilted nanopillars that exhibit a magnetic hardening. The first-order reversal curves diagrams and micromagnetic simulations revealed that a growth-induced uniaxial anisotropy, associated with an anisotropic surface morphology produced by the glancing angle deposition in the direction perpendicular to the atomic flux, plays an important role in the observed magnetic signatures. These results demonstrate the potential of the MS-GLAD method to fabricate nanostructured films in large area with tailored structural and magnetic properties for technological applications.
Ministerio de Economía y Competitividad (MINECO)/FEDER
Ministerio de Economía y Competitividad (MINECO)
Comunidad de Madrid
Depto. de Física de Materiales
Fac. de Ciencias Físicas
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