  Our first-principles study has revealed unexpected spin polarization of the
Pd(001) substrate in contact with antiferromagnetic CoO overlayers. We give an
evidence that the ferromagnetism of Pd is caused by the zigzag positions of Co
atoms with respect to the Pd interface, resulted from the lattice-mismatch
driven structural relaxation. Thanks to the itinerant nature of its 4d
electrons, we see that the ferromagnetic properties of Pd are highly sensitive
to the local environment and can be enhanced further by increasing the
thickness of CoO overlayer film or/and by applying an additional uniaxial
pressure along c-axis exerted externally on the bottom layers of the Pd
substrate. Our finding provides new functionality for the interfacial moments
of the CoO/Pd system, which can be accessed experimentally, e.g., by the
magneto-optical Kerr effect (MOKE) or/and by element-resolved X-ray magnetic
circular dichroism (XMCD) measurement.
