EXPERIMENTAL-OBSERVATION OF MAGNETOSTOCHASTIC RESONANCE

We report an observation of magnetostochastic resonance (MSR) in bista ble magnetic systems. MSR manifests itself as a peak of a response of such a system to a periodic field as a function of the noise strength. Bi-substituted ferrite-garnet films with uniaxial anisotropy were use d as simple examples of bistable systems. Noise was produced by (i) th ermal fluctuations of an effective magnetic field and (ii) externally applied ''noiselike'' magnetic fields. The position of the peak depend ed dramatically on the magnitude of applied de fields, so that de fiel ds of about 1 mOe in the spatial scale of 10 mu m were measured. MSR a pplications to various tunneling phenomena such as tunneling of magnet ization in small magnetic particles are discussed.