A new method for determining the transport spin polarization, point contact
tunneling from a low temperature superconductor into a ferromagnet, is use
d to determine the spin polarization of several LaSrMnO thin films and crys
tals. The Andreev process and its utility in measurements of spin-polarizat
ion are described. Preliminary results for the spin polarization of LSMO ar
e presented. (C) 1999 American Institute of Physics. [S0021-8979(99)20408-2
].