Europhys. Lett.
Volume 61, Number 2, January 2003
Page(s) 242 - 246
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 January 2003
DOI: 10.1209/epl/i2003-00225-3
Europhys. Lett., 61 (2) , pp. 242-246 (2003)

Observation of the magnetic structure in manganites by the high-resolution Bitter technique

F. L. Barkov1, L. Ya. Vinnikov1, N. A. Tulina1, S. A. Zver'kov1, A. Arsenov2, Y. M. Mukovskii2 and D. A. Shulyatev2

1  Institute of Solid State Physics RAN - Chernogolovka, Moscow dist., 142432 Russia
2  Moscow State Steel and Alloys Institute - Leninskii pr-t, 4, Moscow, Russia

(Received 14 August 2002; accepted in final form 7 November 2002)

The magnetic structure of the doped perovskite manganites $\chem{La_{0.7}Sr_{0.3}MnO_3}$ and $\chem{La_{0.8}Ca_{0.2}MnO_3}$ at a temperature of 10 $\un{K}$ has been investigated by using the decoration technique in a wide region of external magnetic fields (up to 1000 $\un{Oe}$). We observe the multidomain ferromagnetic state in $\chem{La_{0.7}Sr_{0.3}MnO_3}$ and the coexistence of the ferro- and nonmagnetic phases in $\chem{La_{0.8}Ca_{0.2}MnO_3}$. The dependence of the structure on an external magnetic field has been investigated in $\chem{La_{0.8}Ca_{0.2}MnO_3}$.

71.28.+d - Narrow-band systems; intermediate-valence solids.
75.30.-m - Intrinsic properties of magnetically ordered materials.
75.30.Vn - Colossal magnetoresistance.

© EDP Sciences 2003