Dr. Mike has posted this message over in the Few questions to Dr. Mike Thread:
I have received a description of an experiment and some results. It's proprietary, so that's that. If you get the paper listed in References on magnetism about magnetic viscosity you can see where the term Sv comes from.Also in the forums, nleseul asks:
Anisotropy energy has a time constant in nanoseconds. Sv has a time constant in milliseconds. One of the formula in the above paper shows
Sv = -k*T/(dE/dH)
where k = Boltzman's constant, T = absolute temperature, and dE/dH = change in energy barrier with respect to external field.
What's interesting is that they claim dE/dH should be measured at constant M_irr where "irr" is a reference to irreversible processes. M is permanent magnet field strength (I think). If it's irreversible it's an energy loss and entropy gain. That says
it will be really hard to see any violation of CoE in this process.
But I've got more to read, and lots of questions to ask. So check out that paper and let's see if we can figure out Sv!
Patience, persistence, truth,
Care to tell us your initial impression of their setup, though? Does it look like an experiment that would answer the question and be worth your time to do?And Dr. Mike responds:
I've got some questions for them, but I want to read up on magnetic viscosity and how Sv is used in the literature. The main tie in for me is via anisotropy energy - seems like it's quite similar and has the same underlying physics as magnetic viscosity.Dr. Mike also posted this comment here in regards to his trip in July:
I think one of the main problems is that the term "magnetic viscosity" has different meanings in different contexts. I think "domain realignment time" is more appropriate for what Steorn is talking about compared to what ferrofluids or AC motors use the term for. Maybe - I have to read some more.
No tickets yet. Promise was for next week. But I have something to read up on, so I can wait! For fun, check out:Now everyone start reading!
and read up on Sv.