Abstract
The temperature and in plane magnetic field dependences of the transverse voltage, VY, were studied in patterned epitaxial films of La0.7Ca0.3MnO3(LCMO)/MgO and La0.7(Ca0.5Sr0.5)0.3MnO3(LSCMO)/MgO. Above the Curie temperature, TC, VY(T) shows the same insulating behavior as the longitudinal voltage, VX(T). With the onset of long range ferromagnetic order near TC, an additional contribution to VY appears, exhibiting a sin(2α) dependence on the angle α between the current and the magnetic field, H. An hysteretic VY(H) behavior with two minimums at the coercive field, ±HC, due to the magnetization reversal, was found in the ferromagnetic regime. A magneto voltage, ΔVY(0.5 kOe)/VY(0)=400%, and a low-field sensitivity of 20%/Oe (50 μV/Oe) for Hext=10–20 Oe in a LSCMO film were observed at room temperature. The results are explained as an anisotropic magnetoresistance (AMR) effect, which becomes maximal slightly below TC. The maximal AMR ratios, 1.7% and 1.5–2.3%, were obtained for LCMO and LSCMO films, respectively.
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