Cu Metal/Mn Phthalocyanine Organic Spinterfaces atop Co with High Spin Polarization at Room Temperature

Abstract

The organic spinterface describes the spin-polarized properties that develop, due to charge transfer, at the interface between a ferromagnetic metal (FM) and the molecules of an organic semiconductor. Yet, if the latter is also magnetic (e.g. molecular spin chains), the interfacial magnetic coupling can generate complexity within magnetotransport experiments.Also, assembling this interface may degrade the properties of its constituents (e.g. spin crossover or non-sublimable molecules). To circumvent these issues, one can separate the molecular and FM films using a less reactive nonmagnetic metal (NM). Spin-resolved photoemission spectroscopy measurements on the prototypical system Co(001)//Cu/Mnphthalocyanine (MnPc) reveal that the Cu/MnPc spinterface atop ferromagnetic Co is highly spin-polarized at room temperature, up to Cu spacer thicknesses of at least 10 monolayers.Ab-initio theory describes a spin polarization of the topmost Cu layer after molecular hybridization that can be accompanied by magnetic hardening effects. This spinterface's

Fluorinated Phthalocyanine Molecules on Ferromagnetic Cobalt: A Highly Polarized Spinterface

“…The spinterface magnetism may be controlled electrically using either an adjacent artificial magnetoelectric or using ferroelectric molecules . The spinterface magnetism and spin polarization may also be established across noble metal spacers. , Finally, the high transport spin polarization at RT of the Co/C spinterface was also experimentally demonstrated . At low temperatures, spin-polarized scanning tunneling microscopy on a single CoPc molecule adsorbed on an FM Fe film showed a significant spin dependence of tunneling current flow …”

Innovation of Materials, Devices, and Functionalized Interfaces in Organic Spintronics

“…Reproduced with permission. [ 174 ] Copyright 2018, WILEY‐VCH. e) Top panels: spin‐resolved photoemission spectra as a function of the binding energy after subtraction of a suitably normalized pure Co spectrum for 2 ML F 16 CoPc on Cu (001)/Co.…”

“…revealed a high spin polarization in the prototypical system Co/Cu/MnPc using SPSS, where Cu was spin‐polarized to form the Cu/MnPc spinterface atop Co, and the measurements were verified by ab initio calculations (Figure 12d). [ 174 ] Recently, a similar method was employed to demonstrate the fluorination effect of several MLs of CoPc on the Co (001) surface. [ 173 ] The main findings revealed the electronic properties and the formation of highly spin‐polarized interface states close to the Fermi level.…”

Hybridization-Induced Inversion of Spin Polarization at Rubrene/Ferromagnetic Cobalt Interface

“…These desirable properties have been exploited in conventional electronics and spintronics. − In the field of spintronics, OSCs are suitable for hosting spin-polarized carriers due to the spin–orbital coupling and hyperfine interactions being relatively weak in these materials. , The weak spin–orbital interaction in OSCs can result in long spin relaxation and dephasing times compared to inorganic semiconductors. − In organic-based spintronic devices, the OSCs are mainly used as a spin transport layer placed between two ferromagnetic electrodes as organic spin valves (OSVs). , The OSCs/ferromagnetic interfaces (spinterface) play a crucial role in tailoring the spin injection from the ferromagnet to the organic spacer . The spin-dependent properties of organic/ferromagnetic metal interfaces have recently received considerable attention. − Photoemission spectroscopy (PES), especially spin-resolved PES, is powerful tool for studying the electron and spin phenomena at the spinterface. For example, a high spin injection efficiency for hot electrons and a spin diffusion length as long as 12.6 ± 3.4 nm at the CuPc/Co(001) interface were determined by spin-resolved two-photon photoemission spectroscopy (2PPE) .…”