Thank you @Satur9. This was actually one of the posts I read before, but chose not to post to it because it was specific to 13.56MHz. Also looking back I am now realizing I used MHz instead of KHz in my calculation which threw off the inductance calculation.
Given your explanation and calculated inductance, 66pacific is calling for approximately 127 turns, which is a bit large for what I am working with. I am interested in this ferrite strip as a solution. Does this change any of the calculations? Or does it just enhance the magnetic field to get a longer read distance?
How thin should this be? Would something like this work?
Would a steel ring core work if I magnetized it?
I should also note in my design I am using a ceramic ring core. Based on what I have read appears to have the same or nearly the same permeability as air. I’m assuming my finger is changing this, but from what I have read it is also similar to air.