Noncontact measurement of magnetoresistance of magnetic metallic superlattices

A method of measuring the magnetoresistance of metallic superlattices is pr oposed. The superlattice is placed at the antinodal point of the resonator electric field so that its plane is perpendicular to the direction of the e lectric field. The loaded Q-factor of the resonator connected as a transmit ting element is measured. The constant magnetic field is applied in the sup erlattice plane. The measurements are performed in the quasi-static frequen cy band 0.5-2 GHz. Under these conditions, the rf current is perpendicular to the plane of the superlattice layers. It is shown that the relative vari ation of the modulus of the transmission coefficient is at least twice as l arge as that of the de-measured magnetoresistance.