  We report the \QTR{it}{pinned/biased} \QTR{it}{moment} in the superlattices
consisting of ferromagnetic (FM) SrRuO$_3$ and antiferromgnetic (AFM)
SrMnO$_3$. This superlattice system shows anisotropy and oriented
pinning/biasing in the field-cooled (FC) hysteresis loop. The in-plane
cooling-field provides antiferromagnetic orientations while out-of-plane
cooling-field provides ferromagnetic orientations to the pinned/biased moments.
The spacer layer thickness, strength and orientation of magnetic field, cooling
field, and driving current influence the pinning strength. We propose that the
magnetic structure is a repetition of $AFM/Pin/FM$($Free$)/$Pin$ unit below a
critical field to explain its magnetic and transport properties. The transport
behavior is discussed using the spin-dependent conduction.
