Tailoring Magnetic Properties of Zigzag Structured Thin Films via Interface Engineering and Columnar Nano-structuring

TL;DR

This study demonstrates how interface engineering and nanostructuring in zigzag thin films can be used to precisely control magnetic anisotropy, enhancing their potential for advanced spintronic applications.

Contribution

It introduces a novel method of tuning magnetic properties in zigzag thin films through interface and columnar structure manipulation, surpassing conventional film anisotropy levels.

Findings

Interface-induced shape anisotropy significantly influences magnetic behavior.

Tunable magnetic response from isotropic to anisotropic achieved.

High-density interfaces are key to controlling anisotropy.

Abstract

We report the emergence of a novel interface-induced shape anisotropy component in zigzag-structured thin films fabricated via Sequential Oblique Angle Deposition (S-OAD). In this study, we systematically investigate cobalt (Co) and Co2FeAl (CFA) thin films by varying column length, number of bilayers, and magneto-crystalline anisotropy (MCA) to explore how structural modulation affects magnetic behavior. Using magneto-optical Kerr effect (MOKE) measurements in conjunction with synchrotron-based grazing-incidence small-angle X-ray scattering (GISAXS) and 2D X-ray diffraction (2DXRD), we reveal that the interplay between interface-induced, shape, and crystalline anisotropies allows for a tunable magnetic response, ranging from isotropic to anisotropic behavior. The observed uniaxial magnetic anisotropy (UMA) exceeds that of conventional OAD films, while column merging is effectively suppressed through precise multilayer engineering. Structural analysis confirms that periodic, high-density interfaces at the junctions of oppositely tilted columns are central to this anisotropy control. These findings demonstrate that interface engineering and columnar nanostructuring within zigzag nanostructures offer a powerful route for tailoring magnetic properties in zigzag thin films, enabling their application in next-generation spintronic and magnetic sensor technologies.