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With x-ray absorption spectroscopy and polarized neutron reflectometry westudied how the magnetic proximity effect at the interface between the cupratehigh-$T_C$ superconductor $\mathrm{YBa_2Cu_3O_7}$ (YBCO) and the ferromagnet$\mathrm{La_{2/3}Ca_{1/3}MnO_3}$ (LCMO) is related to the electronic andmagnetic properties of the LCMO layers. In particular, we explored how themagnitude of the ferromagnetic Cu moment on the YBCO side depends on thestrength of the antiferromagnetic (AF) exchange coupling with the Mn moment onthe LCMO side. We found that the Cu moment remains sizeable if the AF couplingwith the Mn moments is strongly reduced or even entirely suppressed. Theferromagnetic order of the Cu moments thus seems to be intrinsic to theinterfacial CuO$_2$ planes and related to a weakly ferromagnetic intra-planarexchange interaction. The latter is discussed in terms of the partialoccupation of the Cu $3d_{3z^2-r^2}$ orbitals, which occurs in the context ofthe so-called orbital reconstruction of the interfacial Cu ions.

physical review. b./physical review. b

X-ray absorption study of the ferromagnetic Cu moment at the  $\mathbf{{YBa_2Cu_3O_7}/{La_{2/3}Ca_{1/3}MnO_3}}$ interface and the variation  of its exchange interaction with the Mn moment