We report an observation of magnetostochastic resonance (MSR) in bistable 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 used as simple examples of bistable systems. Noise was produced by (i) thermal fluctuations of an effective magnetic field and (ii) externally applied ‘‘noiselike’’ magnetic fields. The position of the peak depended dramatically on the magnitude of applied dc fields, so that dc fields of about 1 mOe in the spatial scale of 10 μm were measured. MSR applications to various tunneling phenomena such as tunneling of magnetization in small magnetic particles are discussed.
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Grigorenko et al. (1994) studied this question.
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