Form and magnetic birefringence in undulated Permalloy/PET films

Abstract

We report the measurement of form and magnetic birefringence in Permalloy (Ni80Fe20) films grown on rippled Poly(Ethylene Terephthalate), PET, substrates. Prior to Permalloy deposition, Laser Induced Periodic Surface Structures (LIPSS) were generated on the polymeric substrate by a nanosecond laser beam, developing an ordered rippled nanostructure. Due to their high transparency factor, we could investigate the behavior of linear polarized light transmitting at normal incidence on Permalloy/PET sample. The results show the existence of an optical axis parallel to the ripples direction, which yields an strong form birefringence effect arising from the laser patterning. Concerning the Permalloy thin film, the study of its in-plane magnetization was carried out measuring the Voigt magnetooptical effect. The obtained data in our samples reveal the appearance of two different mechanisms to reverse the magnetization, as the external magnetic field is parallel or perpendicular to the ripples direction. Accordingly, the transmitted light shows a magnetic birefringence depending on the relative orientation between the ripple direction, i.e. the optical axis of the LIPSS, and the in-plane magnetization of the Permalloy film.

Quo Vadis LIPSS?—Recent and Future Trends on Laser-Induced Periodic Surface Structures

“…Additionally, the localized laser surface processing could help to spatially confine the analyte solution during an additional evaporation-based concentration enhancement step [ 97 , 98 ]. Magnetic and superconducting properties of LIPSS: Several authors started to investigate the impact of LIPSS on magnetic [ 99 , 100 , 101 ] and superconducting properties [ 102 ]. …”

“…Magnetic and superconducting properties of LIPSS: Several authors started to investigate the impact of LIPSS on magnetic [ 99 , 100 , 101 ] and superconducting properties [ 102 ].…”

Anisotropy engineering of soft thin films in the undulated magnetic state

“…with different Permalloy film thicknesses from 10 nm up to 30 nm. We have also proved existence of complete UMA in transmission configuration (Voight effect) despite of the strong birefringence effect of the undulated PET substrates 24 . Data in Supplementary Materials (sect.…”

Magnetic Properties of Nanosized Fe and FeCo Systems on Trenched Mo Templates

“…A different choice is to achieve in-plane uniaxial magnetic anisotropy that may be obtained in a common way by organizing matter into linear objects with a small dimensionality for example nanowires, stripes, and nanotubes with regular shape and spacing [2,3] or by depositing magnetic systems on valley's deeps of undulated surfaces [14]. Moreover, nanowires and linear systems can be implemented in a wide range of applications in domains such as electronics [15], photonics [16,17], sensoristics [18], or thermoelectrics [19].…”