Structural and magnetic properties of an InGaAs/Fe$_3$Si superlattice in cylindrical geometry

TL;DR

This study investigates the structure and magnetic properties of a rolled-up InGaAs/Fe3Si superlattice in cylindrical form, revealing how geometry influences magnetization and interface quality through microscopy, diffraction, and magnetometry.

Contribution

It introduces a novel cylindrical superlattice structure formed by self-rolling, analyzing its structural integrity and magnetic behavior, which has not been extensively studied before.

Findings

Oxide-free interfaces and crystalline bonding areas identified.

Lattice mismatch between layers quantified.

Cylindrical geometry significantly affects magnetization behavior.

Abstract

The structure and the magnetic properties of an InGaAs/Fe3Si superlattice in a cylindrical geometry are investigated by electron microscopy techniques, x-ray diffraction and magnetometry. To form a radial superlattice, a pseudomorphic InGaAs/Fe3As bilayer has been released from its substrate self-forming into a rolled-up microtube. Oxide-free interfaces as well as areas of crystalline bonding are observed and an overall lattice mismatch between succeeding layers is determined. The cylindrical symmetry of the final radial superlattice shows a significant effect on the magnetization behavior of the rolled-up layers.