Anomalous Hall hysteresis in Tm3Fe5O12/Pt with strain-induced perpendicular magnetic anisotropy

TL;DR

This study reveals how strain-induced perpendicular magnetic anisotropy in Tm3Fe5O12/Pt bilayers influences anomalous Hall hysteresis, highlighting the roles of proximity ferromagnetism and spin currents at room temperature.

Contribution

It demonstrates the impact of interface strain and layer placement on anomalous Hall effects in ferrimagnetic insulator/metal bilayers, introducing new insights into magnetic anisotropy and spin transport.

Findings

Large Hall hysteresis loops observed at room temperature.

Insertion of Cu layer affects Hall hysteresis magnitude.

Proximity ferromagnetism and spin currents both contribute to the effect.

Abstract

We demonstrate robust interface strain-induced perpendicular magnetic anisotropy in atomically flat ferrimagnetic insulator Tm3Fe5O12 films grown with pulsed laser deposition on substituted-Gd3Ga5O12 substrate which maximizes the tensile strain at the interface. In bilayers consisting of Pt and TIG, we observe large squared Hall hysteresis loops over a wide range of thicknesses of Pt at room temperature. When a thin Cu layer is inserted between Pt and TIG, the Hall hysteresis magnitude decays but stays finite as the thickness of Cu increases up to 5 nm. However, if the Cu layer is placed atop Pt instead, the Hall hysteresis magnitude is consistently larger than when the Cu layer with the same thickness is inserted in between for all Cu thicknesses. These results suggest that both the proximity-induced ferromagnetism and spin current contribute to the anomalous Hall effect.