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Coexistence of ferromagnetic and superconducting orders and their interplayin ferromagnet-superconductor heterostructures is a topic of intense research.While it is well known that proximity of a ferromagnet suppressessuperconducting order in the superconductor, there exist few studies indicatingthe proximity of a superconductor suppressing ferromagnetic order in aferromagnet. Here we demonstrate a rare observation of the suppression offerromagnetic order in a LaCaMnO3 layer separated from a YBa2Cu3O7-{\delta}layer by a thin insulator (SrTiO3). Polarized neutron reflectivity measurementson LaCaMnO3\SrTiO3\YBa2Cu3O7-{\delta} trilayer deposited on [001] SrTiO3 singlecrystal substrates shows the emergence of a thin magnetic dead layer inLaCaMnO3 adjacent to the insulating layer below its superconducting transitiontemperature of YBa2Cu3O7-{\delta}. Further, the magnetic dead layer grows inthickness when the insulating layer is made thinner. This indicates a possibletunneling of the superconducting order-parameter through the insulating SrTiO3inducing modulation of magnetization in LaCaMnO3.

Superconductivity-induced Magnetic Modulation in a Ferromagnet Through an Insulator in LaCaMnO3\SrTiO3\YBa2Cu3O7-{\delta} Hybrid Heterostructures