Observation of anomalous Hall effect in Cu-Py-crossed structure with in-plane magnetization

Abstract

We investigate a series of Cu-Py-crossed stripe devices in which the contact magnetoresistance behavior exhibits hysteretic loops originating from anomalous Hall effect in Py at the Cu/Py contact area with in-plane magnetization. These highly reproducible hysteretic loops relate directly to the magnetization switching of Py wires at the crossed regions. The nonzero magnitude of resistance difference (ΔR) between the two remnant states at zero Oe depends on the width of Cu by a roughly reciprocal relation, but is independent of that of Py wire. The ΔR ranges between 0.1 ∼ 0.6 mΩ with Cu width of 100 nm ∼ 500 nm and Cu/Py thickness of (65 nm)/(31 nm) ∼ (50 nm)/(20 nm). The results provide understanding of how the Hall voltage is induced and sensed.