Direct measurement of the spin polarization of Co2FeAl in combination with MgO tunnel barriers

Schebaum O, Ebke D, Niemeyer A, Reiss G, Moodera JS, Thomas A. Direct measurement of the spin polarization of Co2FeAl in combination with MgO tunnel barriers. In: Journal of Applied Physics. JOURNAL OF APPLIED PHYSICS. Vol 107. AMER INST PHYSICS; 2010.It is a truth universally acknowledged that a Heusler compound in possession of a good order must be in want of a high spin polarization. In the present work, we investigated the spin polarization of the Heusler compound Co2FeAl by spin polarized tunneling through a MgO barrier into a superconducting Al-Si electrode. The measured spin polarization of P=55% is in good agreement with the previously obtained tunnel magnetoresistance values and compared to the data by other groups. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3358245