  We present a new family of exchange biased Single Molecule Magnets in which
antiferromagnetic coupling between the two components results in quantum
behaviour different from that of the individual SMMs. Our experimental
observations and theoretical analysis suggest a means of tuning the quantum
tunnelling of magnetization in SMMs. See also: W. Wernsdorfer, N.
Aliaga-Alcalde, D. Hendrickson, G. Christou, Nature 416 (2002) 406.
