DW propagation velocity
DW propagation velocity
(OP)
Hello
Where can one find domain wall propagation velocity for materials like soft/hard ferrites or electrical steel? Nothing fancy or nanoscale, only regular magnetic flux paths.
It must depend on grade and composition but it's strange that doesn't get specified. Or is there an other name to look for?
I've seen papers refering to values of 1000 m.s in some alloys. Thats gives an idea what to expect, but surely that will change for orders of magnitude from one to another.
Do you have pointer to figures, please?
Best
Where can one find domain wall propagation velocity for materials like soft/hard ferrites or electrical steel? Nothing fancy or nanoscale, only regular magnetic flux paths.
It must depend on grade and composition but it's strange that doesn't get specified. Or is there an other name to look for?
I've seen papers refering to values of 1000 m.s in some alloys. Thats gives an idea what to expect, but surely that will change for orders of magnitude from one to another.
Do you have pointer to figures, please?
Best





RE: DW propagation velocity
RE: DW propagation velocity
I have ever found that, for permenent magnets, VSM measurement gave a higher coercivity than SQUID. That was because VSM normally is set up to pick up data points faster than SQUID. That could also mean the measurment speed is faster than domain wall propagation or domain reversal process. so mm/s scale sounds more realistic to me.
RE: DW propagation velocity
Domain wall velocity as such is an un-important or a minor variable. Where wall motion can be identified in the devices you indicate, maximum velocities are on the order of 100 m/s at best. Other mechanisms quickly dominate the flux reveral process and are much faster.
RE: DW propagation velocity
RE: DW propagation velocity
I personally never measured speed of DW, but i did read some research papers saying it was a couple of mm/s. But i cannot say 100 m/s is impossible.
RE: DW propagation velocity
RE: DW propagation velocity
The question came from an attempt to understand why some poorly designed transformers with long cores show a voltage phase shift on secondary, seen when operated had higher frequency than designed for. An effect happening at about 20 to 100 m/s looked as a good candidate for that empiric and pagan interpretation
RE: DW propagation velocity
If you take a look at the equivalent circuit of a transformer (internet search is simple enough), the source of your phase shift will be come more evident.
For frequencies well above the thransormer design condiiton, you will also need to include the winding capacitances, etc.