Tunable Spin Seebeck Thermopower in Nonlocal Perovskite MAPbBr₃‐Based Structure

Abstract

Recently organic–inorganic hybrid perovskite (OIHP) has risen suddenly to become a superstar for spintronic applications. Fundamental understanding of its spin properties is of great importance for future advances of its applications in spin‐optoelectronic devices. In this work, the authors pioneer modulation of the spin Seebeck thermopower (SSTP) in a Pt/MAPbBr3/NiFe nonlocal structure via longitudinal spin Seebeck effect measurements. They unravel the effective magnon injection into the perovskite film from the NiFe layer, and the tunability of SSTP in this structure is easily realized through the optimization of morphology and component engineering of the OIHP film. First, upon biasing samples with a magnetic flux density during the preparation process, a high‐quality OIHP film can be obtained, in which the spin scattering can be reduced leading to the SSTP enhancement. Second, by doping Cr into the OIHP lattice, the increased magnetic moment density and the additional in‐plane inverse Rashba–Edelstein effect synergistically improve spin accumulation in the Pt layer and thus tune its SSTP. Unveiling those phenomena is important to understanding magnon transport in the OIHP interlayer, which is instructive for designing magnonic devices based on OIHP film.

Spintronic Phenomena and Applications in Hybrid Organic–Inorganic Perovskites

“…First, classical spintronic phenomena almost start from inorganic systems (metals, oxides, semiconductors, topological insulators, etc. ), and some have been extended to hybrid perovskite family, such as magnon transport, [207] Spin-Seebeck effect, [227] and spin-photogalvanic effect. [160] Despite these great achievements, most spintronic properties are still limited in inorganic materials and remain to be explored in hybrid perovskites.…”

Emerging Spintronic Materials and Functionalities

“…[61] Another intriguing study of spin transport involved spin Seebeck thermopower (SSTP) in an MAPbBr 3 -based nonlocal structure. [62] An effective magnon injection was realized through an NiFe ferromagnet. With appropriate doping by Cr, both increases of the magnetic moment density and in-plane inverse Rashba-Edelstein effect synergistically led to SSTP enhancement.…”