Discussion Forum

Hello everyone,

I am currently working on simulating the electromagnetic interaction between a Hall plate and a surrounding coil in an IC, and I have run into a persistent convergence issue.

My coil model contains very small gaps (typically < 0.5 μm), and the coil itself is made of wide, thin metal (width ~30 μm, thickness ~0.5 μm). Because of this high aspect ratio, my simulation consistently fails with a Maxwell divergence error (e.g., divergence cleaning failed). Increasing the mesh density did not solve the problem; it only led to a severe out-of-memory (OOM) issue.

I have tried the following troubleshooting steps, but none of them resolved the error:

1. Using a Custom Mesh Sequence: I applied a "Free Triangular" mesh to the coil surfaces and used a "Swept" mesh across its thickness. For the remaining domains (the spherical air domain and the Hall plate), I used a "Free Tetrahedral" mesh.

• Result: This effectively reduced the total number of mesh elements and memory load, but the divergence error still occurred.

2.Using "Remove Details" in Geometry: I tried using the Remove Details operation to eliminate small geometrical features in the air gap region.

• Result: The divergence error persists.

These are the approaches I could think of so far, but I am certain I must be overlooking a critical setting (perhaps a specific boundary condition for thin structures?). Has anyone encountered a similar issue or can point me in the right direction to debug this?

Thank you very much for your help!