Tuning magnetic properties by roll-up of Au/Co/Au films into microtubes

Abstract

Au/Co/Au trilayers are fabricated by tilted deposition on prestructured polymer sacrificial layers. The metal trilayers are released by selectively dissolving the sacrificial layer and roll-up into microtubes. Magnetization properties are strongly affected by the roll-up process. In addition to a modified shape anisotropy, the magnetostrictive anisotropy due to the anisotropic stress release is reversed. Low temperature measurements support the presence of significant exchange bias in these rolled-up structures.

Towards compact three-dimensional magnetoelectronics—Magnetoresistance in rolled-up Co/Cu nanomembranes

“…Similar result is reported for Au/Co microtubes. 18 A second feature observed in our samples is the enhancement of MR after roll-up. The increase of MR with respect to the planar structures amounts to $10% and $20% for S1 and S2, respectively.…”

Magnetic and mechanical properties of rolled-up Au/Co/Au nanomembranes with multiple windings

“…To date, only a few experimental attempts to study the magnetic properties of rolled-up microtubes are reported in the literature. [17][18][19] Mechanical properties of rolled-up microtubes under axial compression have been investigated by Zhang et al 20,21 The instrumented indentation (also called nanoindentation if done on the nanoscale) is a well-established technique to investigate mechanical properties of thin films. Here, mechanical parameters can be directly obtained by measuring the indentation load and displacement.…”

Fabrication of scrolled magnetic thin film patterns

“…In the case of magnetic microtubes, a layer of photoresist a few micrometers thick has been commonly used as the sacrificial layer. 8,11,12 There is a need to explore new sacrificial layers, compositions and deposition conditions which affect residual stresses responsible for the formation of microtubes.…”