Magnetic after-e!ect in manganite "lms

M. SIRENA; L. B. STEREN; J. GUIMPEL

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

Año: 2001 p. 847 - 848

0304-8853

The time dependence of the magnetic and transport properties on LaSrMnO "lms and bulk samples has been studied through magnetization and resistivity measurements. A magnetic after-e!ect has been observed in all samples. At low temperatures, the low-"eld magnetization, can be described by the function M(t)"M#M exp(!t/)#SrMnO "lms and bulk samples has been studied through magnetization and resistivity measurements. A magnetic after-e!ect has been observed in all samples. At low temperatures, the low-"eld magnetization, can be described by the function M(t)"M#M exp(!t/)#!ect has been observed in all samples. At low temperatures, the low-"eld magnetization, can be described by the function M(t)"M#M exp(!t/)#"eld magnetization, can be described by the function M(t)"M#M exp(!t/)# S(H,¹)ln(t). The resistivity increases logarithmically in the same temperature range, indicating the evolution of the sample to a more disordered state. Above a characteristic temperature, this behaviour is reversed and an increase of the magnetization with time is observed. The relaxation parameters depend on the bulk or "lms character of the samples. In the latter case, a dependence on the "lm thickness was found. A direct correlation between the time dependence of the resistivity and magnetization curves in manganite compounds was found. 2001 Elsevier Science B.V. All rights reserved.(H,¹)ln(t). The resistivity increases logarithmically in the same temperature range, indicating the evolution of the sample to a more disordered state. Above a characteristic temperature, this behaviour is reversed and an increase of the magnetization with time is observed. The relaxation parameters depend on the bulk or "lms character of the samples. In the latter case, a dependence on the "lm thickness was found. A direct correlation between the time dependence of the resistivity and magnetization curves in manganite compounds was found. 2001 Elsevier Science B.V. All rights reserved."lms character of the samples. In the latter case, a dependence on the "lm thickness was found. A direct correlation between the time dependence of the resistivity and magnetization curves in manganite compounds was found. 2001 Elsevier Science B.V. All rights reserved."lm thickness was found. A direct correlation between the time dependence of the resistivity and magnetization curves in manganite compounds was found. 2001 Elsevier Science B.V. All rights reserved. 2001 Elsevier Science B.V. All rights reserved.