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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J.J. Krebs, P. Lubitz, A. Chaiken and G.A. Prinz, Phys. Rev. Lett. 63 (1989) 1645.
A. Cebollada, J.L. Martinez, J.M. Callego, J.J. de Miguel, R. Miranda, S. Ferrer, F. Batallan, G. Fillion and J.P. Rebouillat, Phys. Rev. B 39 (1989) 9726.
J.J. Rhyne, R.W. Erwin, J. Borchers, S. Sinha, M.B. Salamon, R. Du and C.P. Flynn, J. Appl. Phys. 61 (1987) 4043.
B. Heinrich, Z. Celinski, J.F. Cochran, W.B. Muir, J. Rudd, O.M. Zhong, A.S. Arrott and K. Myrtle, Phys. Rev. Lett. 64 (1990) 673.
G. Lugert and G. Bayreuther, Phys. Rev. B 38 (1988) 11068.
J. Tyson, A. Owens and J.C. Walker, Magn. Magn. Mat. 35 (1983) 126.
C.J. Gutierrez, S.H. Mayer and J.C. Walker, J. Magn. Magn. Mater. 80 (1989) 299.
G. Bayreuther and G. Lugert, J. Magn. Magn. Mat. 35 (1983) 50.
J.C. Levy and J.L. Motchane, J. Vac. Sci. Tech. 9 (1971) 721.
Z.Q. Qiu, S.H. Mayer, C.J. Gutierrez, H. Tang and J.C. Walker, Phys. Rev. Lett. 63 (1989) 1649.
U. Gradmann, J. Korecki and G. Waller, Appl, Phys. A 39 (1986) 101.
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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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DOI: https://doi.org/10.1007/BF02395878