  The unconventional Josephson coupling in a ferromagnetic weak link between
d-wave superconductors is studied theoretically.
  For strong ferromagnetic barrier influence, the unconventional coupling, with
ground state phase difference across the link $0<\phi_{\rm gs}\leq \pi$, is
obtained at small crystal misorientation of the superconducting electrodes, in
contrast to the case of normal metal barrier, where it appears at large
misorientations. In both cases, with decreasing temperature there is an
increasing range of misorientations, where $\phi_{\rm gs}$ varies continuously
between 0 and $\pi$.
  When the weak link is a part of a superconducting ring, this is accompanied
by the flow of spontaneous supercurrent, of intensity which depends (for a
given misorientation) on the reduced inductance $l=2\pi LI_c(T)/\Phi_0$, and is
non-zero only for $l$ greater than a critical value. For $l\gg 1$, another
consequence of the unconventional coupling is the anomalous quantization of the
magnetic flux.
