Ferromagnetic Resonance study of sputtered Ru(7 nm)/NiFe(t FM)/IrMn(6 nm)/Ru(5 nm) exchange-biased bilayers at X and Q-band microwave frequencies reveals the excitation of spin-wave and NiFe resonance modes. Angular variations of the in-plane resonance fields of spin-wave and NiFe resonance modes show the effect of the unidirectional anisotropy, which is about twice larger for the spin-wave mode due to spin pinning at the NiFe/IrMn interface. At Q-band frequency the angular variations of in-plane resonance fields also reveal the symmetry of a uniaxial anisotropy. A modified theoretical model which also includes the contribution of a rotatable anisotropy provides a good description of the experimental results. © 2014 Elsevier B.V.
De Sousa, M. A., Pelegrini, F., Alayo, W., Quispe-Marcatoma, J., & Baggio-Saitovitch, E. (2014). Parallel ferromagnetic resonance and spin-wave excitation in exchange-biased NiFe/IrMn bilayers. Physica B: Condensed Matter, 167-172. https://doi.org/10.1016/j.physb.2014.05.050