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. Iââ¬â¢m not sure that the energy density of a magnet can >> be >> [...] > >
