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

TL;DR

This study investigates the anisotropic magnetoresistive behavior of La_{1-x}Ca_{x}MnO_{3} films at temperatures well below their Curie temperature, revealing distinct field-dependent resistance changes based on field orientation.

Contribution

It provides new insights into the anisotropic magnetoresistance of La_{1-x}Ca_{x}MnO_{3} films at low temperatures, highlighting behavior not previously reported.

Findings

Magnetoresistance varies with magnetic field orientation and strength.

Distinct MR behavior observed for perpendicular and parallel fields.

Anisotropic effects are prominent only below 18 K.

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.