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Microwave magnetoabsorption in R0.6Sr0.4MnO3 (R = Pr and Nd)

We report microwave magnetoabsorption (P) at room temperature in R0.6Sr0.4MnO3 (R = Pr and Nd) samples. P as a function of dc magnetic field (-2.5 kOe to +2.5 kOe) was measured for a broad frequency range (f = 0.1 - 4 GHz) of microwave magnetic field using a vector network analyzer and a copper strip coil which encloses one of the above samples. As the external dc magnetic field decreased from the maximum field, P initially increases and shows a maximum for a critical field and then decreases as the field approaches zero. The critical field increases with increasing frequency of the microwave signal. Line shape analysis of the obtained spectra suggests that the observed features in P are caused by ferromagnetic resonance (FMR) in R = Pr and electron paramagnetic resonance (ESR) in R = Nd samples, which were confirmed using a coplanar waveguide-based broadband magnetic resonance spectrometer.

preprint2020arXivOpen access

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