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- Title
Low-field microwave absorption in Ga-doped polycrystalline La<sub>0.6</sub>Sr<sub>0.4</sub>MnO<sub>3</sub> in the frequency range from 0.1 to 4 GHz.
- Authors
Chanda, A.; Mahendiran, R.
- 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.
- Subjects
ELECTRON paramagnetic resonance; GYROMAGNETIC ratio; FERROMAGNETIC resonance; MICROWAVES; MAGNETIC resonance; FREQUENCY spectra; COPLANAR waveguides; POLYCRYSTALLINE silicon
- Publication
Journal of Materials Science: Materials in Electronics, 2020, Vol 31, Issue 18, p15175
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-020-04081-4