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Low-field microwave absorption in Ga-doped polycrystalline La0.6Sr0.4MnO3 in the frequency range from 0.1 to 4 GHz

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Abstract

We investigated the magnetic-field-dependent microwave absorption in polycrystalline La0.6Sr0.4Mn1-xGaxO3 samples (x = 0.0–0.3) over a wide frequency spectrum (f = 0.1–4 GHz) and up to a magnetic field of Hdc= 2.5 kOe at room temperature. The field dependence of microwave power absorption (ΔP) in each sample exhibits a peak at a critical value of Hdc and the peak moves towards higher fields as frequency increases. The shift is at a faster rate for x = 0.2 and 0.3 compared to x = 0.01 and 0.1. Based on the line shape analysis, we attribute the observed features to ferromagnetic resonance for x ≤ 0.1 and a combined effect of electron spin resonance and superparamagnetic resonance for x ≥ 0.2. Our results are also verified by magnetic resonance spectra recorded using a coplanar waveguide spectrometer. We extracted the gyromagnetic ratio, saturation magnetization, and anisotropy field in our samples. Frequency-tunable microwave absorption at resonance found in these materials will be of interest for high-frequency device applications.

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Acknowledgments

R. M. thanks to the Ministry of Education for supporting this work (Grant Nos: R144-000-381-112 and R144-000-404-114).

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  1. Physics Department, National University of Singapore, 2 Science Drive 3, Singapore, 117551, Republic of Singapore

    A. Chanda & R. Mahendiran

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  1. A. Chanda
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  2. R. Mahendiran
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Chanda, A., Mahendiran, R. Low-field microwave absorption in Ga-doped polycrystalline La0.6Sr0.4MnO3 in the frequency range from 0.1 to 4 GHz. J Mater Sci: Mater Electron 31, 15175–15183 (2020). https://doi.org/10.1007/s10854-020-04081-4

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