Anisotropic magnetoresistive properties of La_{1-x}Ca_{x}MnO_{3} (x \approx 1/3) film at temperatures far below the Curie temperature

Abstract

A sharp distinction between magnetoresistance (MR) behavior for the magnetic fields applied perpendicular (H_{perp}) and parallel (H_{par}) to the film plane is found in colossal-magnetoresistance film La_{1-x}Ca_{x}MnO_{3} (x \approx 3). At increasing of H_{perp} the MR is first negative (at H_{perp} < 4 kOe), then positive (4 kOe < H_{perp} < 12 kOe), and then negative again (H_{perp} > 12 kOe). At increasing of H_{par} the MR is positive below H_{par} \simeq 6 kOe and negative above it. In both cases the magnetic field was perpendicular to the current. The anisotropic behavior of this kind occurs only at low temperatures (T < 18 K) and is quite different from the results of previous studies.