Article
Physics, Multidisciplinary
Li Jing, Ding Shuai-Shuai, Hu Wen-Ping
Summary: Spintronics is a promising technology for next-generation quantum computing and memory, and organic spintronics, compared to inorganic spintronics, offers advantages such as flexibility and low-cost fabrication process. The organic spin valve, composed of two ferromagnetic electrodes and an organic space layer, is a classical device in organic spintronics. The enhanced or inverted magnetoresistance in the organic spin valve is induced by the spin-dependent hybridization between molecular and ferromagnetic interface, known as spinterface. However, there are still unresolved questions regarding the mechanism and manipulation of spinterface.
ACTA PHYSICA SINICA
(2022)
Article
Engineering, Electrical & Electronic
Neha Jha, Anand Pariyar, Tahereh Sadat Parvini, Christian Denker, Pavan K. Vardhanapu, Gonela Vijaykumar, Arne Ahrens, Tobias Meyer, Michael Seibt, Nicolae Atodiresei, Jagadeesh S. Moodera, Swadhin K. Mandal, Markus Muenzenberg
Summary: Delocalized carbon-based radical species with unpaired spin have been used to fabricate Cu-PLY- and ZnPLY-based organic magnetic tunnel junctions. These junctions show nonlinear and weakly temperature-dependent current-voltage characteristics, indicating tunneling as the dominant transport mechanism. Cu-PLY-based OMTJs exhibit significant magnetoresistance due to the formation of hybrid states at the metal-molecule interfaces called spinterface, and also show stable voltage-driven resistive switching.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Yanuo Zhu, Qinglin Jiang, Jiang Zhang, Yuguang Ma
Summary: Spintronics, a rapidly developing discipline, focuses on the spin-dependent transport process of electrons. Spin valves, significant carriers of spintronics, have the potential to surpass Moore's Law and become core components in next-generation processors. Organic semiconductors show promise in spin valves due to their adjustable band gap, weak spin-orbit coupling, excellent film-forming property. This paper introduces the principle of spin valves, summarizes the history and progress in organic spin injection and transport materials, analyzes the influence of spinterface on device performance, and discusses challenges and future prospects. It aims to draw researchers' attention to organic spin valves and promote further research in spintronics.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Ilaria Bergenti, Takeshi Kamiya, Dongzhe Li, Alberto Riminucci, Patrizio Graziosi, Donald A. MacLaren, Rajib K. Rakshit, Manju Singh, Mattia Benini, Hirokazu Tada, Alexander Smogunov, Valentin A. Dediu
Summary: Orbital hybridization at the Co/C-60 interface strongly enhances the magnetic anisotropy of the cobalt layer, while also affecting its ability to support spin-polarized currents and inducing a spin-filtering effect.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Review
Chemistry, Physical
Shuaishuai Ding, Yuan Tian, Wenping Hu
Summary: This article summarizes the recent progress in reliable fabrication and evaluation strategies for organic spin valves (OSVs), focusing on challenges such as protecting spin interface properties, optimizing device performance, addressing dead layer issues, and discussing general protocols for reliable evaluation of performance and identification of transport mechanisms. Key fundamentals leading to spurious magnetoresistance response are also highlighted, along with future perspectives on spintronic devices of organic materials.
Article
Chemistry, Multidisciplinary
Chao Wang, Hua Hao, Keisuke Tajima
Summary: A diradicaloid molecule with high semiconducting performance has been synthesized based on the quinoidal benzo[1,2-b:4,5-b']dithiophene structure. The diradical character and its influence on the electronic properties are investigated. The diode devices based on this molecule exhibit a large change in electric current in magnetic fields below 100 mT, with a strong dependence on the measurement temperatures. This is attributed to the population of triplet diradicals at high temperatures, leading to significant magnetoconductance values. The study highlights the essential role of triplet diradicals in achieving negative magnetoconductance in organic molecules.
Article
Materials Science, Multidisciplinary
Ying Wang, Jiarong Yao, Shuaishuai Ding, Siyu Guo, Dapeng Cui, Xinyue Wang, Shuyuan Yang, Lijuan Zhang, Xinzi Tian, Di Wu, Chao Jin, Rongjin Li, Wenping Hu
Summary: Research on organic single crystals grown on a liquid substrate and used to construct single-crystalline OSVs revealed high magnetoresistance responses and spin transport properties. A magnetoresistance value as high as 17% was measured with an intermediate layer thickness of 269 nm. Spin transport was observed in single crystals up to a thickness of 457 nm, much larger than that of polycrystalline thin films.
SCIENCE CHINA-MATERIALS
(2021)
Article
Chemistry, Physical
Yun Ni, Jia Li, Wei Tao, Hao Ding, Rui-Xue Li
Summary: This paper studied the transport properties of defected ZGNR with a graphene nanobubble through first-principles quantum transport calculations. When the nanobubble is intact and located at the center, the spin polarization and magnetoresistance tend to decrease at low bias voltages, while when the nanobubble is split and located at the edge, all transport properties are significantly affected and altered. New results obtained from the device include the negative differential resistance effect and the pure thermal-induced spin-current.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Liwen Zhang, Jun Chen, Lei Zhang, Fuming Xu, Liantuan Xiao, Suotang Jia
Summary: Graphene with micrometer spin relaxation length presents promising potential in spintronics, but efficient spin injection remains a challenge. Generating spin current in ZGNR via photogalvanic effect provides a novel approach to achieve spin injection without accompanying charge current, and the spin current generation and polarization can be controlled through a dual gate system.
Article
Physics, Multidisciplinary
Ling-Mei Zhang, Yuan-Yuan Miao, Zhi-Peng Cao, Shuai Qiu, Guang-Ping Zhang, Jun-Feng Ren, Chuan-Kui Wang, Gui-Chao Hu
Summary: Based on first-principles calculations, the bias-induced evolutions of hybrid interface states in pi-conjugated tricene and in insulating octane magnetic molecular junctions are investigated. Obvious bias-induced splitting and energy shift of the spin-resolved hybrid interface states are observed in the two junctions. The research reveals the phenomenon of bias-induced reconstruction of hybrid interface states in molecular spinterface devices.
Review
Quantum Science & Technology
Pascal Martin, Bruno Dlubak, Pierre Seneor, Richard Mattana, Marie-Blandine Martin, Philippe Lafarge, Francois Mallet, Maria Luisa Della Rocca, Simon M-M Dubois, Jean-Christophe Charlier, Clement Barraud
Summary: Spintronics is a quantum technology that incorporates the spin quantum degree into conventional CMOS electronics. Since the discovery of giant magneto-resistance in 1988, spintronics has been widely used in everyday applications, and also shows promising post-CMOS prospects. Carbon nanostructures, such as molecules, graphene, and carbon nanotubes, are among the most sought-after materials in this field.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Article
Physics, Applied
Esita Pandey, Brindaban Ojha, Subhankar Bedanta
Summary: The strength of the interfacial Dzyaloshinskii-Moriya interaction (iDMI) and the dynamics of domain walls (DWs) were investigated in a Pd/Co/C60/Pd system. The iDMI was found to increase from -0.07 to -0.46 mJ/m2 with increasing C60 thickness, transforming an achiral Bloch wall into a chiral Neel wall. This is significant for the use of carbon-based materials in chiral-DW-based device applications.
PHYSICAL REVIEW APPLIED
(2023)
Article
Nanoscience & Nanotechnology
Zhipeng Cao, Yuanyuan Miao, Shuai Qiu, Guangping Zhang, Junfeng Ren, Chuankui Wang, Guichao Hu, Lina Zhao
Summary: In this study, the spin polarization and transport ability of hybrid interface states at benzene/Ni surface were investigated using density functional theory and nonequilibrium Green's function method. The results showed that introducing a top probe electrode at different sites on the molecule disturbed the spin polarization of the projected density of states and the interfacial spin density distribution in different ways. It was found that the center contact was better for achieving a large tunneling magnetoresistance at low bias, while the edge and top contacts were useful for obtaining a slightly larger spin polarization of the current.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Review
Chemistry, Multidisciplinary
Dong Li, Gui Yu
Summary: Organic spintronics is an emerging field that has attracted the interest of the scientific community, utilizing synthesized organic materials to combine the degrees of freedom of spin and charge, with great potential in device performance.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Li-Chung Yu, Yu-Ling Lai, Ming-Wei Lin, Hung-Wei Shiu, Jiu-Hua Lin, Der-Hsin Wei, Hong-Ji Lin, Yao-Jane Hsu
Summary: Tailoring the organic-inorganic heterostructure through nanotechnology and molecular engineering is a promising route to achieve high performances of spintronics. By manipulating the magnetic exchange coupling of a hybrid organic-ferromagnetic complex through coevaporation, paramagnetic nanoclusters with varied volume ratios of Alq(3) to Co were fabricated. The extent of hybridization strongly correlates with the coercivity and magnetic moment of the paramagnetic thin films, showcasing efficient spin filtering for molecular/organic spintronics.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Moritz Will, Nicolae Atodiresei, Vasile Caciuc, Philipp Valerius, Charlotte Herbig, Thomas Michely
Article
Physics, Multidisciplinary
Wouter Jolie, Clifford Murray, Philipp S. Weiss, Joshua Hall, Fabian Portner, Nicolae Atodiresei, Arkady Krasheninnikov, Carsten Busse, Hannu-Pekka Komsa, Achim Rosch, Thomas Michely
Article
Chemistry, Physical
Silke Rose, Peter Nemes-Incze, Marco Pratzer, Vasile Caciuc, Nicolae Atodiresei, Markus Morgenstern
Article
Materials Science, Multidisciplinary
Vasile Caciuc, Nicolae Atodiresei, Stefan Bluegel
PHYSICAL REVIEW MATERIALS
(2019)
Article
Materials Science, Multidisciplinary
David A. Duncan, Nicolae Atodiresei, Simone Lisi, Phil J. Blowey, Vasile Caciuc, James Lawrence, Tien-Lin Lee, Maria Grazia Betti, Pardeep Kumar Thakur, Ada Della Pia, Stefan Bluegel, Giovanni Costantini, D. Phil Woodruff
PHYSICAL REVIEW MATERIALS
(2019)
Article
Chemistry, Physical
Shigeru Tsukamoto, Masato Nakaya, Vasile Caciuc, Nicolae Atodiresei, Tomonobu Nakayama
Article
Chemistry, Physical
Stefan Kraus, Alexander Herman, Felix Huttmann, Marco Bianchi, Raluca-Maria Stan, Ann Julie Holt, Shigeru Tsukamoto, Nico Rothenbach, Katharina Ollefs, Jan Dreiser, Ken Bischof, Heiko Wende, Philip Hofmann, Nicolae Atodiresei, Thomas Michely
Summary: Sandwich-molecular wires consisting of europium and cyclooctatetraene were grown on a graphene template and their band structure and magnetic properties were investigated. The wires exhibit a unique band structure and an easy-axis magnetization along the wire direction.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Caio C. Silva, Daniela Dombrowski, Nicolae Atodiresei, Wouter Jolie, Ferdinand Farwick zum Hagen, Jiaqi Cai, Paul T. P. Ryan, Pardeep K. Thakur, Vasile Caciuc, Stefan Blugel, David A. Duncan, Thomas Michely, Tien-Lin Lee, Carsten Busse
Summary: The lattice mismatch between a monolayer of MoS2 and its Au(111) substrate induces a moire superstructure, leading to a spatial variation of electronic bands. Using a combination of experimental techniques and density functional theory, the geometric and electronic structure of the interface is determined with precision. The analysis identifies the fraction of interfacial atoms strongly interacting with the substrate and examines the variation of electronic structure in relation to the moire unit cell and band characteristics.
Article
Chemistry, Multidisciplinary
Stefan Kraus, Alexander Herman, Felix Huttmann, Christian Kramer, Konstantin Amsharov, Shigeru Tsukamoto, Heiko Wende, Nicolae Atodiresei, Thomas Michely
Summary: The on-surface synthesis of the eight-membered sp(2) carbon-based ring cyclooctatetraene (C8H8, Cot) with ytterbium and thulium on graphene yields different products for the two lanthanides. Ytterbium synthesis results in long YbCot wires, while thulium synthesis produces repulsively interacting TmCot dots. The outcome of the reaction can be controlled by tuning the electron chemical potential in graphene.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Engineering, Electrical & Electronic
Neha Jha, Anand Pariyar, Tahereh Sadat Parvini, Christian Denker, Pavan K. Vardhanapu, Gonela Vijaykumar, Arne Ahrens, Tobias Meyer, Michael Seibt, Nicolae Atodiresei, Jagadeesh S. Moodera, Swadhin K. Mandal, Markus Muenzenberg
Summary: Delocalized carbon-based radical species with unpaired spin have been used to fabricate Cu-PLY- and ZnPLY-based organic magnetic tunnel junctions. These junctions show nonlinear and weakly temperature-dependent current-voltage characteristics, indicating tunneling as the dominant transport mechanism. Cu-PLY-based OMTJs exhibit significant magnetoresistance due to the formation of hybrid states at the metal-molecule interfaces called spinterface, and also show stable voltage-driven resistive switching.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Alexandre Artaud, Nicolas Rougemaille, Sergio Vlaic, Vincent T. Renard, Nicolae Atodiresei, Johann Coraux
Summary: Unlike conventional 2D semiconductor superlattices, moire patterns in 2D materials are flexible and their properties depend on their topography. Our study reveals that out-of-plane deformations of membranes in 2D materials can affect their electronic, magnetic, optical, and mechanical properties, and we have experimentally validated our predictions.
Article
Materials Science, Multidisciplinary
Stefan Kraus, Felix Huttmann, Jeison Fischer, Timo Knispel, Ken Bischof, Alexander Herman, Marco Bianchi, Raluca-Maria Stan, Ann Julie Holt, Vasile Caciuc, Shigeru Tsukamoto, Heiko Wende, Philip Hofmann, Nicolae Atodiresei, Thomas Michely
Summary: In this study, a single-crystal sheet of graphene is synthesized on the low-symmetry substrate Ir(110) and its structure and electronic properties, as well as its moire structure with the substrate, are investigated using various techniques. The study shows that the adsorbed graphene layer forms a wave pattern of nanometer wavelength, which can be used for templated adsorption and alignment of molecules.
Article
Materials Science, Multidisciplinary
Philipp Valerius, Carsten Speckmann, Boris Senkovskiy, Alexander Gruneis, Nicolae Atodiresei, Thomas Michely
Summary: Patterns formed in monolayer graphene and hexagonal boron nitride under ion irradiation were investigated using scanning tunneling microscopy. Subnanometer pores with periodic distribution were created, and excess vacancies were expelled from the array. Successful delamination of a perforated graphene monolayer was achieved, providing a new material for membrane research.
Article
Chemistry, Multidisciplinary
Alexander Herman, Stefan Kraus, Shigeru Tsukamoto, Lea Spieker, Vasile Caciuc, Tobias Lojewski, Damian Guenzing, Jan Dreiser, Bernard Delley, Katharina Ollefs, Thomas Michely, Nicolae Atodiresei, Heiko Wende
Summary: From macroscopic heavy-duty permanent magnets to nanodevices, precise control of magnetic properties in rare-earth metals is crucial for various daily life applications. In this study, a proof-of-concept approach using a dysprosium-iridium surface alloy and graphene adsorption is presented, enabling the tailored manipulation of magnetic properties. By selectively lifting magnetic 4f-metal atoms from the surface alloy through the adsorption of graphene, a giant magnetic anisotropy in dysprosium atoms is introduced. The successful introduction and demonstration of this concept provide a clear understanding of its underlying mechanism and pave the way for an alternative approach to modify the crystal field around 4f-atoms and their magnetic anisotropies.
Article
Materials Science, Multidisciplinary
Mihovil Bosnar, Vasile Caciuc, Nicolae Atodiresei, Ivor Loncaric, Stefan Bluegel
