  Majorana zero modes are expected to arise in semiconductor-superconductor
hybrid systems, with potential topological quantum computing applications. One
limitation of this approach is the need for a relatively high external magnetic
field that should also change direction at nanoscale. This proposal considers
devices that incorporate micromagnets to address this challenge. We perform
numerical simulations of stray magnetic fields from different micromagnet
configurations, which are then used to solve for Majorana wavefunctions.
Several devices are proposed, starting with the basic four-magnet design to
align magnetic field with the nanowire and scaling up to nanowire T-junctions.
The feasibility of the approach is assessed by performing magnetic imaging of
prototype patterns.
