Question: Tunneling magnetoresistance between two ferromagnetic films oriented parallel and antiparallel was measured to be 0.4, referring to Equation (11.1). Calculate the spin polarization P and

Tunneling magnetoresistance between two ferromagnetic films oriented parallel and antiparallel was measured to be 0.4, referring to Equation (11.1). Calculate the spin polarization P and the corresponding relative percentages n^↑(E_F) and n^↓(E_F) for the tunneling electrons.

Equation (11.1)

magnetoresistance = Rapar Rpar Rapar Gpar - Gapar Gpar 2P 1 + P

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