I am a student that's very new to magnetism in general and I've been reading/learning for the past few weeks.
I'd like to build magnetic tweezers to use in materials with kPa order stiffness - so I would need very high fields and gradients.
However, from the little I understand, it looks like if I use ferromagnetic particles with the magnetic tweezers, the forces applied only depend on the field gradient? Torque doesn't matter to me - I just need to observe the displacement of the particles.
My main question and source of confusion is the following:
How do I generate very high/steep magnetic field gradients? Do I automatically need very high fields in order to have steep gradients?
I've done a lot of searching and all I could really find was a Helmholtz/Maxwell coil pair. I was wondering if there were any other ways to generate a very steep magnetic field gradient?
I am also open to using permanent magnets.