Fig. 1. The three molecules (asparagine, glutamic acid, and threonine) described in the experimental setup. The experiments were conducted in three different configurations. (A) A magnet, either pointing with its North pole up (N) or down (S), is positioned underneath a ferromagnetic substrate (FM). The Ni(120 nm)/Au(10 nm) FM film was evaporated on silicon and points towards the racemic solution. Blue and red denote the S and N poles, respectively. (B) Two magnets, one oriented N and the other S, are placed underneath the Si/Ni/Au substrate in a racemic mixture. (C) Two magnets, one oriented N and the other S, are placed underneath the Si/Ni/Au substrate in an enantiopure solution. (D) The suggested mechanism for the enantioselective crystallization. When a chiral molecule approaches the ferromagnetic surface charge polarization occurs, accompanied by spin polarization. The interactions are stronger when the spins of the FM are aligned antiparallel to the spin of the chiral molecule. Therefore, the enantiomer with the stronger interaction has a longer residence time at the magnetic site and a greater chance to crystallize.