Paramagnetic resonance in La2NiMnO6 probed by impedance and lock-in detection techniques

•We report microwave absorption in La2NiMnO6 at 300 K using two cavity-less methods.•Magnetoimpedance and broadband resonance methods were used.•Sharp frequency dependent features appear while sweeping dc magnetic field.•Observed features in both methods reflect occurrence of paramagnetic resonance....

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Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 518; p. 167400
Main Authors Chaudhuri, Ushnish, Panda, Debendra Prasad, Sundaresan, A., Mahendiran, R.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 15.01.2021
Elsevier BV
Subjects
Broadband
Coils
Coils (strip)
Coplanar waveguides
Damping
Frequency analysis
Frequency ranges
Impedance method
Line shape
Magnetic permeability
Microwave absorption
Paramagnetic resonance
Perovskites
Reactance
Room temperature
Spin-orbit interactions
Strip
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Summary:•We report microwave absorption in La2NiMnO6 at 300 K using two cavity-less methods.•Magnetoimpedance and broadband resonance methods were used.•Sharp frequency dependent features appear while sweeping dc magnetic field.•Observed features in both methods reflect occurrence of paramagnetic resonance.•Data analysis indicates non-negligible orbital contribution of Ni2+ cation to Landé g-factor. We studied the frequency-dependent (f = 1 GHz to 5 GHz) microwave absorption in the double perovskite La2NiMnO6 at room temperature using two cavity-less methods: An indirect impedance method that uses a radio frequency impedance analyzer and a folded copper strip coil for the frequency range f = 1–2.2 GHz and a lock-in based broadband setup using a coplanar waveguide for microwave excitation in the frequency range f = 2–5 GHz. The high-frequency resistance of the strip coil exhibits a sharp peak and the reactance curve crosses zero at a critical value of dc magnetic field as a consequence of the paramagnetic resonance in the sample. The resonance fields (Hr) obtained from both the techniques increase linearly with frequency. Line shape analysis and analytical fitting were performed to characterize the material in terms of its initial susceptibility and damping parameters. From the fit, we obtain a large spectroscopic g-factor, equal to 2.1284, which supports the presence of Ni2+ cation with strong spin-orbit coupling.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2020.167400