We show that a magnetic strip on top of a superconducting strip magnetized in a specified direction may considerably enhance the critical current in the sample. At fixed magnetization of the magnet we observed the diode effect---the value of the critical current depends on the direction of the transport current. We explain these effects by a influence of the nonuniform magnetic field induced by the magnet on the current distribution in the superconducting strip. The experiment on a hybrid Nb∕Co structure confirmed the predicted variation of the critical current with a changing value of magnetization and direction of the transport current.
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Vodolazov et al. (2005) studied this question.
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