Edit: after skimming the paper, two interesting things stand out to me - it seems like the resolution is limited by the detector, maybe that can be systematically improved. And the lit review doesn’t actually discuss MFM, but does discuss electron holography (which I didn’t know about but is cool) and a couple other recent SEM based techniques that have more specialized hardware requirements
From a security perspective I would feel like it might help us find more flaws in the silicon that create these security nightmares.
From a purely honest perspective..... I'm amazed at how complex modern chips and the packaging have become. It feels like black magic, but I don't want to call it that cuz it feels like I'm overlooking the insane talent and labor that goes into making these things feasible
There are also techniques for the TEM (transmission electron microscope) to visualize and measure magnetic fields such as electron holography.
Esentially by splitting the electron beam in two, passing half through vacuum and half through a magnetic sample, then recombining the beams, you can extract magnetic information from the interference pattern of the two beams with some Fourier analysis magic.
I have a writeup with examples from a project i did years ago on my blog, if anyone is interested: https://longcreek.me/blog/2021/holography-intro
Walkthrough of calculations using Python: https://longcreek.me/blog/2021/holography-code
Is that T for Tesla? Two Tesla, in a SEM sample? Wouldn't that tear most SEMs apart?
And what kind of SEM sample can generate a field like that? Surely not any microscopic sample?
For anyone interested the author (Mikhail Gribkov) loves macro photography in general: https://rtraveler.ru/nature/rossijskij-fotograf-izobrel-unik...
Which color it is ? /s