Spin-Wave Excitations in NiFe/Cu/IrMn Heterostructures with a Variable Thickness Copper Spacerстатья
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Дата последнего поиска статьи во внешних источниках: 8 июня 2022 г.
Аннотация: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.