A magnetic oxide-quantum dot nanocomposite has at least one magnetic oxide nanoparticle coated with a silica (SiO2) shell and terminated with at least one thiol group (—SH) and at least one CdSe/ZnS quantum dot linked with the at least one SiO2-coated magnetic oxide nanoparticle via the at least one thiol group. The at least one magnetic oxide nanoparticle can be an iron oxide (Fe3O4) nanoparticle. A method of cancer treatment using the magnetic oxide-quantum dot nanocomposites, includes the steps of delivering a plurality of nmagnetic oxide-quantum dot nanocomposites to a cancer cell, and subjecting the cancer cell with the plurality of magnetic oxide-quantum dot nanocomposites to a radio frequency induction for a period of time effective to cause the cancer cell to die.
