Abstract
Spin waves in NiFe/Cu/IrMn heterostructures with a variable thickness copper spacer (tCu) have been studied by Mandelstam–Brillouin spectroscopy (Brillouin light scattering, BLS). The redistribution of contributions from grains with different sizes has been discovered, which causes a frequency shift of dispersion curves with varying Cu spacer thickness. In the case of magnetic field inversion, the resonance frequencies of Stokes and anti-Stokes lines shift. This shift characterizing the reverse bias value monotonically decreases with increasing tCu and completely disappears with the formation of a continuous Cu layer more than 1 nm thick. As the copper layer becomes thicker, the heterostructure becomes more uniform, as a result of which the energy density fluctuations of NiFe–IrMn exchange interaction smooth out and BLS spectral lines narrow.
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This investigation was performed according to thematic map AAAA-A19-119111390022-2 of the Institute of Problems of Chemical Physics, Russian Academy of Sciences, and in the framework of a program of the President of the Russian Federation for state support of leading scientific schools (grant no. 2644.2020.2).
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Translated by V. Isaakyan
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Bakhmet’ev, M.V., Gubanov, V.A., Sadovnikov, A.V. et al. Spin-Wave Excitations in NiFe/Cu/IrMn Heterostructures with a Variable Thickness Copper Spacer. J. Exp. Theor. Phys. 134, 204–210 (2022). https://doi.org/10.1134/S1063776122020017
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DOI: https://doi.org/10.1134/S1063776122020017