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Abstract
We fabricated α-Fe(100)/Nd2Fe14B(001) bilayer films with different thicknesses values of the α-Fe layer on MgO(100) substrates by using an ultra-high-vacuum (UHV) magnetron sputtering system. The exchange coupling constant at the heterointerfaces of α-Fe(100)/Nd2Fe14B(001) was evaluated by analyzing the magnetization curves and the ferromagnetic resonance (FMR) spectra. We observed a significant lower shift of the α-Fe resonance field compared to that of the α-Fe single layer irrespective of the Fe-layer thickness, which suggests the existence of an internal field owing to a positive exchange coupling between the α-Fe(100) and the Nd2Fe14B(001) layers.
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