Abstract
We present measurements of tunneling spin polarization of Co72Fe20B8 in Al∕AlOx∕CoFeB tunnel junctions using superconducting tunneling spectroscopy. We consistently observe high spin polarization (above 53%), higher than that measured for comparable CoFe alloys, indicating a crucial role played by the 8% atomic boron. X-ray diffraction measurements on 700Å thick films reveal an amorphous structure for as-deposited films, while anneals above 250°C initiate a gradual crystallization. Superconducting quantum interference device magnetometery shows that the magnetic moment exhibits minor changes after anneals, but there is a dramatic change in the coercivity after anneals above 400°C. However, these structural and magnetic changes induce only a slight change in the tunneling spin polarization of CoFeB.
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