Spin polarization of field-emitted electrons from Co2MnSi emitter fabricated by focused ion beam technique

We measured the spin polarization of fieldemitted electrons from a single-crystalline $Co_{2}$ MnSi expected theoretically to be the spin polarization of 100% at the Fermi edge. The single-crystalline $Co_{2}$ MnSi film deposited on Cr buffered layer on MgO(001) was formed into a field emitter shape by using focused ion beam technique. The spin polarization from the emitter was about 23% at room temperature.