Dave, I am no expert on spin batteries, but I think that the battery material is driven to a stable state of high magnetic energy by subjecting its dipoles to a strong magnetic field. I believe that almost all of the energy at that point is in the magnetic field. I do not know how homogenous the best storage materials are, nor how structured their domains are.
Conversion of the stored energy into electrical current is described in the presentation. I wish I could find more references. The theory of storage of energy in the e-m fields still seems pretty contentious. For example, google "Feynman disk paradox" - there are a number of different 'solutions' to how momentum in magnetic circuits is converted into mechanical momentum. Quite perplexing. -- Lou Pagnucco Dave Roberson wrote: > Lou, > > > Are you suggesting that there is a natural store of magnetic spin energy > which can be tapped by one of these devices? I am under the impression > that they are extracting the overall magnetic energy due to internal > alignment of the magnetic domains. > > > In your concept, what does a material that has this energy depleted behave > as? How would it differ from other chunks of the same type that are > fresh? > > > Is there any way to measure a before and after effect other than by > measuring the change in external fields? > > > Dave > > > > -----Original Message----- > From: pagnucco <pagnu...@htdconnect.com> > To: vortex-l <vortex-l@eskimo.com> > Sent: Sat, Apr 13, 2013 12:06 am > Subject: RE: [Vo]:Yildiz motor in Geneva -- ran 5.5 hours then broke down > > > Jones, > > I believe that this places an approximate upper bound on how much energy > can be stored in the magnetic field of a Kg of material without an > externally supplied current, and that, if the output exceeds this bound, > some other energy source is being tapped. The energy density given in the > presentation for the spin battery is up to 10X that of Li-ion batteries. > > Perhaps, there is something I am overlooking. Comments are welcome. > > -- Lou Pagnucco > > Jones Been wrote: >> This is very interesting, but being mostly related to electronics, it >> does >> not appear to be all that close to what Yildiz is doing ⦠yet >> spintronics of >> a different sort could be involved somehow. >> >> Spintronics is a new way of incorporating nano-magnetic effects into >> electronics, which they have done in the spin-battery - but maybe >> spintronics has been inadvertently incorporated into magnets, in order >> to >> get much higher performance without using circuits, per se. >> >> >> -----Original Message----- >> From: pagnu...@htdconnect.com >> >> Pardon if this is old news, but a 'spin battery' is potentially a very >> efficient energy source. From the presentation: >> >> "The Spin Battery" -- Stewart E. Barnes >> http://www.physics.miami.edu/~barnes/SpinBattery.pdf >> >> (SLIDE 30) Theoretical Maximum >> If one changes the magnetic state it is possible >> to recover the Jsd ~ 4eV exchange energy. >> This gives 4.0 x 10^6 J/kg. >> >> Also see - >> "Theoretical spin battery could see magnet powered cars" >> http://www.gizmag.com/spin-battery-magnet/11271/ >> >> -- Lou Pagnucco >> >> Jones Beene wrote: >>> It is a surprise that there is quite a bit of negativity on vortex for >>> this demo. >>> >>> That skepticism could be related to the 5 or 6 other similar claims on >>> Sterling Allan's PESN site which show signs of scam or trickery, but >>> what >>> is >>> specific problem with this one ? ... A noted professor (Duarte) has >>> been >>> allowed to check for hidden batteries or motor - and says there is no >>> trickery. >>> >>> Magnetic fields store energy, not a lot of energy compared to chemical, >>> but it takes energy to align magnetic polarities and this amounts to >> stored >>> spin-energy. Iâ≢m not sure that the energy density of a >>> magnet can >>> be >>> [...] >> >> > > > > >
