This is a whiteboard version of approximately the same material covered in the powerpoint Lectures 3A and 3B from the summer school course Nanoelectronics and the Meaning of Resistance
Homi Bhabha Centenary DAE-BRNS National Conference & HRI School on
'Spintronic and Magnetoelectronic Materials and Devices'
Researchers should cite this work as follows:
Supriyo Datta (2009), "Spins and Magnets (Whiteboard lecture), Part 1," https://nanohub.org/resources/6041.