Sub-micron magnetic patterns and local variations of adhesion force induced in non-ferromagnetic amorphous steel by femtosecond pulsed laser irradiation

Huiyan Zhang, Yuping Feng, Daniel Nieto, Eva García-Lecina, Clare McDaniel, Jordi Díaz-Marcos, María Teresa Flores-Arias, M. O.Connor Gerard, Maria Dolors Baró, Eva Pellicer, Jordi Sort

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2 Citations (Scopus)

Abstract

© 2016 Elsevier B.V. All rights reserved. Periodic ripple and nanoripple patterns are formed at the surface of amorphous steel after femtosecond pulsed laser irradiation (FSPLI). Formation of such ripples is accompanied with the emergence of a surface ferromagnetic behavior which is not initially present in the non-irradiated amorphous steel. The occurrence of ferromagnetic properties is associated with the laser-induced devitrification of the glassy structure to form ferromagnetic (α-Fe and Fe 3 C) and ferrimagnetic [(Fe,Mn) 3 O 4 and Fe 2 CrO 4 ] phases located in the ripples. The generation of magnetic structures by FSPLI turns out to be one of the fastest ways to induce magnetic patterning without the need of any shadow mask. Furthermore, local variations of the adhesion force, wettability and nanomechanical properties are also observed and compared to those of the as-cast amorphous alloy. These effects are of interest for applications (e.g., biological, magnetic recording, etc.) where both ferromagnetism and tribological/adhesion properties act synergistically to optimize material performance.
Original languageEnglish
Pages (from-to)399-406
JournalApplied Surface Science
Volume371
DOIs
Publication statusPublished - 15 May 2016

Keywords

  • Adhesion force
  • Amorphous steel
  • Femtosecond pulsed laser irradiation
  • Magnetic patterning
  • Surface ripples
  • Wettability

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