Emergence of insulating ferrimagnetism and perpendicular magnetic anisotropy in 3d-5d perovskite oxide composite films for insulator spintronic

TL;DR

This study demonstrates the synthesis of high-quality La2/3Sr1/3MnO3-SrIrO3 composite films with perpendicular magnetic anisotropy and ferrimagnetic insulating properties, highlighting their potential for ultralow-dissipation spintronic applications.

Contribution

It introduces a novel epitaxial growth method for LSMO-SIO composite films exhibiting strong PMA and ferrimagnetism, advancing material platforms for spintronics.

Findings

Films exhibit high crystalline quality and homogeneous atomic mixture.

Strong perpendicular magnetic anisotropy observed.

Pronounced spin Hall magnetoresistance and anomalous Hall effect detected.

Abstract

Magnetic insulators with strong perpendicular magnetic anisotropy (PMA) play a key role in exploring pure spin current phenomena and developing ultralow-dissipation spintronic devices, thereby it is highly desirable to develop new material platforms. Here we report epitaxial growth of La2/3Sr1/3MnO3 (LSMO)-SrIrO3 (SIO) composite oxide films (LSMIO) with different crystalline orientations fabricated by sequential two-target ablation process using pulsed laser deposition. The LSMIO films exhibit high crystalline quality with homogeneous mixture of LSMO and SIO at atomic level. Ferrimagnetic and insulating transport characteristics are observed, with the temperature-dependent electric resistivity well fitted by Mott variable-range-hopping model. Moreover, the LSMIO films show strong PMA. Through further constructing all perovskite oxide heterostructures of the ferrimagnetic insulator LSMIO and a strong spin-orbital coupled SIO layer, pronounced spin Hall magnetoresistance (SMR) and spin Hall-like anomalous Hall effect (SH-AHE) were observed. These results illustrate the potential application of the ferrimagnetic insulator LSMIO in developing all-oxide ultralow-dissipation spintronic devices.