Physics – Condensed Matter – Materials Science
Scientific paper
2003-06-04
J. Appl. Physics, 94 (2003) 2459
Physics
Condensed Matter
Materials Science
6 pages, 7 figures, submitted J. Appl. Phys
Scientific paper
10.1063/1.1588356
The DC transport properties of and the radio-frequency (RF) wave absorption (at 1.33 MHz) in a ceramic sample of La_{0.5}Sr_{0.5}CoO_{3-\delta} are measured. The Curie temperature, T_{c}, of the sample is about 250 K. A giant negative magnetoabsorption effect is found. In the vicinity of T_{c}, the absolute value of the magnetoabsorption is about 38 % in the rather low magnetic field 2.1 kOe. This differs drastically from the measured DC magnetoresistance (MR) \delta (H) =[R(0)-R(H)]/R(0) which is a mere 0.26 % near T_{c}in the same field and increases to about 2.15 % in H=20 kOe. The phenomenon can be understood taking into account that the magnetoabsorption is determined by influence of magnetic field on the conductivity and the magnetic permeability, while the MR is determined solely by the former. The magnetoabsorption effect can be used to develop RF devices controlled by magnetic field and temperature.
Belevtsev B. I.
Beznosov A. B.
Cherpak N. T.
Chukanova I. N.
Golubnichaya G. V.
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