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Title: Ac magnetotransport in La0.7Sr0.3Mn 0.95Fe0.05O3 at low dc magnetic fields
Authors: Barik, S.K. 
Mahendiran, R. 
Keywords: A. Manganites
D. Impedance
D. Magnetoresistance
Issue Date: Dec-2011
Citation: Barik, S.K., Mahendiran, R. (2011-12). Ac magnetotransport in La0.7Sr0.3Mn 0.95Fe0.05O3 at low dc magnetic fields. Solid State Communications 151 (24) : 1986-1989. ScholarBank@NUS Repository.
Abstract: We report the ac electrical response of La0.7Sr 0.3Mn1-xFexO3(x=0.05) as a function of temperature, magnetic field (H) and frequency of radio frequency (rf) current (f=0.120MHz). The ac impedance (Z) was measured while rf current directly passes through the sample as well as in a coil surrounding the sample. It is found that with increasing frequency of the rf current, Z(T) shows an abrupt increase accompanied by a peak at the ferromagnetic Curie temperature. The peak decreases in magnitude and shifts down with increasing value of H. We find a magnetoimpedance of ΔZZ=-21% for ΔH=500Oe at f=1MHz around room temperature when the rf current flows directly through the sample and ΔZZ=-65.9% when the rf current flows through a coil surrounding the sample. It is suggested that the magnetoimpedance observed is a consequence of suppression of transverse permeability which enhances skin depth for current flow. Our results indicate that the magnetic field control of high frequency impedance of manganites is more useful than direct current magnetoresistance for low-field applications© 2011 Elsevier B.V. All rights reserved.
Source Title: Solid State Communications
ISSN: 00381098
DOI: 10.1016/j.ssc.2011.09.007
Appears in Collections:Staff Publications

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