Current-induced effective magnetic field in a half-metallic oxide La0.67Sr0.33MnO3

Abstract

We investigated current-induced effective magnetic field Heff in half-metallic oxide La0.67Sr0.33MnO3 (LSMO) films with various thicknesses by using the planar Hall effect. Applying in-plane current to the LSMO films exerted an in-plane Heff orthogonal to the current direction on magnetization. The Heff magnitude increased with increasing current magnitude, and the direction reversed when the applied current switched to opposite sign. Assuming that a 6.5-u.c. insulating layer is created in the LSMO, the values of Heff observed in devices with three different LSMO thicknesses were almost scaled with current density, evaluated from the effective LSMO thickness excluding the insulating layer, suggesting that Heff is induced in the LSMO bulk.