Magnetic behavior of periodic patterns of nickel microwires obtained by laser interference

C. I. ZANDALAZINI; T. ESPINOSA REYES; M. ROSSA; M. I. OLIVA

Puero Varas, Chile

Workshop; XII Latin American Workshop on Magnetism, Magnetic Materials, & their Applications; 2023

Latin American Association of Magnetism (ALMA)

The magnetic behavior of low-dimensional materials has attracted considerable attentionin the fields of sensors, energy storage, catalysis, and wastewater treatment [1]. Among the top-down approaches to produce such structures, direct laser interference patterning (DLIP) standsout as a powerful method that allows the fabrication of periodic patterns with a variety ofgeometries and micrometric precision, while enabling the efficient use of laser output andscalability [2].In this work, we present a study on the shape-dependent magnetic anisotropy of periodicarrays of nickel microwires (MWs) prepared by a two-beam interference configuration of DLIP[3] on sputter-deposited Ni thin films. Both intact Ni thin films and laser-patterned MWs werecharacterized by X-ray diffraction, scanning electronic microscopy, atomic force microscopy,X-ray photoelectron spectroscopy, and vibrating-sample magnetometry. The geometries anddimensions of individual nickel MWs, their surface oxidation state, as well as the periodicityof the whole MW patterns, were characterized in detail to obtain a better understanding of therole of shape anisotropy on the magnetic properties of interest. The magnetic properties werestudied as a function of the magnetic field orientation (from parallel to perpendicular to theaxes of the MWs) and different wire aspect ratios (width/length). The angular dependence ofboth the saturation field and coercivity allows us to infer about sensitivity of the magnetizationreversal mechanism (and squareness, SQ, defined by the ratio of remanent magnetization andsaturation magnetization MR/MS) to the MWs packing density.[1] Gupta, R.K., Mishra, S.R., & Nguyen, T.A. (Eds.). (2022). Fundamentals of Low DimensionalMagnets. CRC Press.[2] Andrés F. Lasagni, Carsten Gachot, Kim E. Trinh, Michael Hans, Andreas Rosenkranz, Teja Roch,Sebastian Eckhardt, Tim Kunze, Matthias Bieda, Denise Günther, Valentin Lang, and Frank Mücklich,Proc. SPIE 10092, Laser-based Micro- and Nanoprocessing XI, 1009211 (2017).[3] L. E. Mulko, E. A. Cuello, C. A. Barbero, G. A. Pino, M. Molina, M. Rossa, Appl. Surf. Sci. 509,145370 (2020)