Spin-Dependent Molecule Symmetry at a Pentacene–Co Spinterface

Chu, Yu-Hsun; Hsu, Chuang‐Han; Lu, Chien-Rong; Yang, Hung-Hsiang; Yang, Tsung‐Han; Luo, Chi-Hung; Yang, Kai-Jheng; Hsu, Shih-Hao; Hoffmann, Germar; Kaun, Chao-Cheng; Lin, Minn-Tsong

doi:10.1021/acsnano.5b03117

Cited by 20 publications

(11 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1d. The current understanding is that the hybridization between 3d ferromagnets and π-conjugated molecules leads univocally to the inversion of the spin-polarization sign at the interface 19,[43][44][45] . In a recent comprehensive study based on spin-resolved photoemission, experimental evidence was provided to show that the presence of highly spin-polarized HISs is a very general phenomenon that does not even require the presence of π electrons in the isolated molecule, or a fully occupied majority d band in the 3d ferromagnet (strong ferromagnetism) 46 .…”

Section: The Molecular Sidementioning

confidence: 99%

Activating the molecular spinterface

2017

View full text Add to dashboard Cite

The miniaturization trend in the semiconductor industry has led to the understanding that interfacial properties are crucial for device behaviour. Spintronics has not been alien to this trend, and phenomena such as preferential spin tunnelling, the spin-to-charge conversion due to the Rashba-Edelstein effect and the spin-momentum locking at the surface of topological insulators have arisen mainly from emergent interfacial properties, rather than the bulk of the constituent materials. In this Perspective we explore inorganic/molecular interfaces by looking closely at both sides of the interface. We describe recent developments and discuss the interface as an ideal platform for creating new spin effects. Finally, we outline possible technologies that can be generated thanks to the unique active tunability of molecular spinterfaces.

show abstract

Section: The Molecular Sidementioning

confidence: 99%

Activating the molecular spinterface

2017

View full text Add to dashboard Cite

show abstract

“…After that, Majumdar et al prepared polymers spin valve with LSMO/P3HT/Co structure, and analyzed that P3HT and LSMO electrodes occurred certain chemical interaction leading to a spin‐selective tunneling interface . Actually, much more organic small molecules were applied in the OSV devices, including tris(8‐hydroxyquinoline)aluminum (Alq 3 ), fullerene (C 60 and C 70 ), rubrene, pentacene, bathocuproine, and lanthanide molecules . In addition, some π‐conjugated polymeric materials like poly(3‐hexylthiophene) (P3HT), poly(2,5‐dioctyloxy‐ p ‐phenylenevinylene), and P(NDI2OD‐T2) were also applied successfully in the OSV devices.…”

Section: Introductionmentioning

confidence: 99%

Magnetoresistance and Spinterface of Organic Spin Valves Based on Diketopyrrolopyrrole Polymers

Zheng

Feng

Gao

et al. 2019

Adv Elect Materials

View full text Add to dashboard Cite

recombination in organic light-emitting diodes and organic magnetoresistance (MR) devices. [9][10][11][12] Moreover, organic semiconductors have obvious advantages, lower cost, and better flexibility, and they have greater possibility in wearable and large area applications. [13][14][15][16][17][18][19][20] The most common prototype organic device using spin freedom is organic spin valves (OSVs), [5,11,[21][22][23][24][25] which consist of a nonmagnetic spacer sandwiched between two ferromagnetic (FM) electrodes, and based on the alignment of the electron spin relative to the FM layer magnetization orientation. In this research field, there are tunneling and diffusive regimes. [26] The tunneling regimes occur in relatively thinner spacers (<15 nm), and the mode is weakly dependent on temperature. The diffusive regimes are also called hoping in organic spintronics. This mode occurs in relatively thicker layers (≥15 nm), and it is strongly dependent on temperature. In addition, the present study lies in the diffusive regime owing of the conductivity mismatch problem and more abundant phenomena like Hanle effect in organic spintronics. For organic semiconductor, both spin-orbit interaction and the hyperfine interaction play very significant parts in determining the spin relaxation, but the origin of determining the spin relaxation in organic semiconductors is still unknown. Herein, OSV effect is characterized by the MR ratios, defined as MR = (R ap − R p )/R p , where R ap and R p denote the resistance in the antiparallel and parallel states of FM electrode magnetization direction, respectively. There are lots of efforts to explore organic spintronics Organic materials are proposed to be excellent spin transport layers due to their weak hyperfine and spin-orbit coupling interaction. Donor−acceptortype polymers PTDCNTVT-420 and PTDCNTVT-320 with diketopyrrolopyrrole (DPP) units are employed as the spacers in the organic spin valves, which have more advantages such as solution processing, higher mobility, and large area fabrication. The performance of polymers spin valves based on DPP units with different alkyl side chain lengths are studied. The different top ferromagnetic (FM) electrodes Co and Ni 80 Fe 20 are used for spin detection resulting in obvious distinct magnetoresistance (MR) values. The MR ratio of approaching 30% at 10 K is achieved with the Ni 80 Fe 20 electrodes using PTDCNTVT-420 with longer alkyl side chain lengths. Moreover, the MR behaviors are observed depending on various temperatures, which are related with the FM electrodes spin injection efficiency. The direct spinterface are also investigated by transmission electron microscopy (TEM) and atomic force microscopy (AFM). In addition, the series of results indicate that the PTDCNTVT polymers can be used as good spin transport model materials and give clues for future polymers spintronic studies.

show abstract

“…This has been studied in some detail for various π-conjugated molecules adsorbed on ferromagnetic surfaces. The most common experimental techniques to probe the interface electronic and magnetic structure are x-ray magnetic circular dichroism (XMCD) [93][94][95], spin-polarized scanning tunneling microscopy (SP-STM) [90,[96][97][98], spin-polarized metastable de-excitation spectroscopy(SP-MDS) [99][100][101], spin-polarized ultraviolet photoelectron spectroscopy (SP_UPS) [102][103][104], and spin-resolved two-photon photoemission (SR-2PPE) [77]. Modeling is typically done with density functional theory (DFT) [89,95,97,98,[104][105][106][107][108][109].…”

Section: Spin Dependent Effects At Hybrid Interfacesmentioning

confidence: 99%

Recent progress in organic spintronics

Jong

2016

Open Physics

View full text Add to dashboard Cite

Abstract:The field of organic spintronics deals with spin dependent phenomena occurring in organic semiconductors or hybrid inorganic/organic systems that may be exploited for future electronic applications. This includes magnetic field effects on charge transport and luminescence in organic semiconductors, spin valve action in devices comprising organic spacers, and magnetic effects that are unique to hybrid interfaces between (ferromagnetic) metals and organic molecules. A brief overview of the current state of affairs in the field is presented.

show abstract

Spin-Dependent Molecule Symmetry at a Pentacene–Co Spinterface

Cited by 20 publications

References 44 publications

Activating the molecular spinterface

Activating the molecular spinterface

Magnetoresistance and Spinterface of Organic Spin Valves Based on Diketopyrrolopyrrole Polymers

Recent progress in organic spintronics

Contact Info

Product

Resources

About