Low Field Giant Magnetoimpedance Effect in TbCo6.2

We report the presence of a giant magnetoimpedance (GMI) effect and multimagnon spin resonance in polycrystalline cylindrical TbCo 6.2 at low magnetic fields. The structural and magnetic characterization supported the formation of well-grained TbCo 6.2 . The magnetoimpedance studies in TbCo 6.2 were...

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Bibliographic Details
Published in:Journal of electronic materials 2024-02, Vol.53 (2), p.815-823
Main Authors: Swetha, A. K., Anil Kumar, A., Vishnuvardhan Reddy, C., Joshi, Rajeev Shesha
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Electronics and Microelectronics
Frequency ranges
Giant magnetoimpedance
Instrumentation
Magnetic fields
Magnetic flux
Magnetic properties
Magnetoimpedance
Magnetoresistance
Magnetoresistivity
Materials Science
Optical and Electronic Materials
Original Research Article
Penetration depth
Permeability
Reactance
Solid State Physics
Spin resonance
Structural analysis
Switching
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Summary:We report the presence of a giant magnetoimpedance (GMI) effect and multimagnon spin resonance in polycrystalline cylindrical TbCo 6.2 at low magnetic fields. The structural and magnetic characterization supported the formation of well-grained TbCo 6.2 . The magnetoimpedance studies in TbCo 6.2 were carried out by monitoring the reactance of the inductive element with varying magnetic field intensity from 0 to 1000 G, which is interpreted through the change of surface permeability driven by penetration depth at lower frequency ranges. The ac magnetoresistance (MR ac ) was found to be of the order of 20%, indicating a significant circular permeability change. Magnetoreactance (MX) of the order of 0.45% was observed, which is advantageous technologically for ac magnetic field sensors operating at lower frequencies. The magnetoimpedance response at high frequency was investigated using a ring resonator with a 50-Ω characteristic impedance and a fundamental resonance frequency of around 2.5 GHz. The switching of the signs of MR from negative to positive was attributed to the switching of macrospin interaction from the dipolar to the exchange kind, useful for frequency-driven magnetoresistive switches. Graphical Abstract
ISSN:0361-5235
1543-186X
DOI:10.1007/s11664-023-10796-x