Please use this identifier to cite or link to this item:
|Title:||Low-field magnetoimpedance in La0.7Sr0.3MO3 (M=Mn,Co)||Authors:||Rebello, A.
D. Colossal magnetoresistance
D. Dynamic susceptibility
|Issue Date:||Aug-2009||Citation:||Rebello, A., Tan, C.L., Mahendiran, R. (2009-08). Low-field magnetoimpedance in La0.7Sr0.3MO3 (M=Mn,Co). Solid State Communications 149 (29-30) : 1204-1208. ScholarBank@NUS Repository. https://doi.org/10.1016/j.ssc.2009.04.027||Abstract:||We compare the ac magnetotransport in two ferromagnetic metallic oxides, La0.7Sr0.3MO3 (with M=Co and Mn) which show similar dc electrical properties. The ac resistance (R) and inductive reactance (X = ω L) of the complex impedance (Z = R + j X) are studied as a function of temperature at a few fixed frequencies (f = 10 kHz to 7 MHz) of the ac current excitation in zero and a low external dc magnetic field (μ0 Hd c = 60 mT). It is shown that as the frequency (f) increases, R in zero field shows a transition from a smooth decrease to an abrupt increase and a peak close to the ferromagnetic Curie temperature (TC). A rapid increase in X at TC was also found for frequencies above 10 kHz. We report a large low-field ac magnetoresistance of 33% (7%) for Mn (Co) in μ0 Hd c = 60 mT at f = 2 MHz, comparable to the high field (μ0 Hd c = 7 T) dc magnetoresistance. It is suggested that the low-field ac magnetoresistance in these compounds arises from the change in the magnetic penetration depth and suppression of magnetic fluctuations close to TC. © 2009 Elsevier Ltd.||Source Title:||Solid State Communications||URI:||http://scholarbank.nus.edu.sg/handle/10635/94170||ISSN:||00381098||DOI:||10.1016/j.ssc.2009.04.027|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Dec 11, 2019
WEB OF SCIENCETM
checked on Dec 4, 2019
checked on Dec 14, 2019
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.