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Giant Room Temperature Magnetoimpedance in La0.7Ba0.15Sr0.15MnO3 and Development of a Sensitive Position Detector

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Observation of room temperature giant magnetoimpedance in La0.7Ba0.15Sr0.15MnO3 compound having nanometric grain size is reported under low magnetic field and over the frequency range between 50 KHz and 15 MHz. Both the resistive and reactive components of impedance increase with increasing frequency due to skin effect of the metallic state below TC. Above a critical frequency (1 MHz), a sharp increase in both R and X and hence Z is observed. The applied magnetic field influences the impedance by affecting the penetration depth via the transverse permeability and gives rise to large magnetoimpedance (∼70%) at low fields up to 0.1 T. Magnetoimpedance of La0.7Ba0.15Sr0.15MnO3 compound display major change (∼61%) between 0.02 and 0.035 T and appears to originate due to the spin alignment of the charge carriers across the grain boundaries. At fields >0.1 T, magnetoimpedance displays near saturation, corresponding to the completion of the spin alignment across the grain boundaries. An unique scaling behavior has been observed for field dependence of magnetoimpedance at various frequencies, which could be well accounted by a phenomenological model. Feasibility of the development of a sensitive linear position sensor is also demonstrated.
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Keywords: AC TRANSPORT; LA0.7BA0.15SR0.15MNO3 COMPOUND; MAGNETO-TRANSPORT PROPERTIES; MAGNETOIMPEDANCE

Document Type: Research Article

Publication date: 2010-04-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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