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Mössbauer studies of spin wave excitations in Fe/Ag multilayers

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Abstract

The magnetic properties of molecular beam epitaxially (MBE) grown FE(110)/Ag(111) heterostructures were investigated with Mössbauer spectroscopy. The Fe bilayers were fixed at 3 ML (monolayer) thickness and the Ag bilayer thickness varied from 4 ML to 20 ML. We found that as the Ag layer became thick enough (>17 ML) to magnetically isolate the Fe layers, a quasi-linear temperature dependence of the hyperfine field results due to the 2-D spin wave excitations. As the Ag layer is reduced, a dimensional crossover in the excitations is induced by the magnetic interaction between Fe layers which makesM(T) change from a two-dimensionalT relation to a three-dimensionalT 3/2 dependence. We constructed a simple theoretical model to motivate the explanation for the experimental results and obtained approximate values for the interlayer coupling strength for various Ag bilayer thicknesses.

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Gutierrez, C.J., Qiu, Z.Q., Wieczorek, M.D. et al. Mössbauer studies of spin wave excitations in Fe/Ag multilayers. Hyperfine Interact 66, 299–307 (1991). https://doi.org/10.1007/BF02395878

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