Exploring room-temperature transport of single-molecule magnet-based molecular spintronics devices using the magnetic tunnel junction as a device platform

Tyagi, Pawan; Riso, Christopher; Amir, Uzma; Rojas‐Dotti, Carlos; Martı́nez-Lillo, José

doi:10.1039/c9ra09003g

Cited by 23 publications

(32 citation statements)

References 33 publications

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“…This paper elaborates experimental and theoretical data in the context of competing coupling via defects and molecules for MTJMSD. The experimental fabrication process for MTJMSD has been discussed elsewhere 8 , 14 , 15 , 19 , 27 . Prior work provides experimental details of patterning, depositing ferromagnetic electrodes, insulating barrier, and molecular attachment method 8 , 14 , 15 , 19 , 27 .…”

Section: Methodsmentioning

confidence: 99%

“…The experimental fabrication process for MTJMSD has been discussed elsewhere 8 , 14 , 15 , 19 , 27 . Prior work provides experimental details of patterning, depositing ferromagnetic electrodes, insulating barrier, and molecular attachment method 8 , 14 , 15 , 19 , 27 . The simulation study in this paper is based on the design of experimentally researched MTJMSDs (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Molecular spintronics devices (MSD) are promising for giving performance better than conventional silicon and spintronics devices 4 and a candidate for providing hardware for quantum computers 5 , 6 . MSD based spin valves utilizing the electron's spin can be formed by chemically stitching molecular channels to the source and drains made up of magnetic materials or ferromagnets (FMs) 7 , 8 . However, it is a daunting task to maintain the molecule dimension (~ 0.5–3 nm) robust and reproducible gap between the two magnetic thin film layers 9 – 11 .…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, paramagnetic molecules reduce the effective tunneling barrier thickness to the length of the bridge between the metal electrode and molecule center 15 . As a result, a highly coherent spin tunneling occurs via the molecular channel, and the physical tunneling barrier in the planner area becomes dormant 8 . As long as a robust insulating layer can be produced between two electrodes, MTJMSD can utilize any combinations out of semiconductor, ferromagnet, and non-metal.…”

Section: Introductionmentioning

confidence: 99%

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Molecular coupling competing with defects within insulator of the magnetic tunnel junction-based molecular spintronics devices

Tyagi

Brown

Grizzle

et al. 2021

Sci Rep

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Nearly 70 years old dream of incorporating molecule as the device element is still challenged by competing defects in almost every experimentally tested molecular device approach. This paper focuses on the magnetic tunnel junction (MTJ) based molecular spintronics device (MTJMSD) method. An MTJMSD utilizes a tunnel barrier to ensure a robust and mass-producible physical gap between two ferromagnetic electrodes. MTJMSD approach may benefit from MTJ's industrial practices; however, the MTJMSD approach still needs to overcome additional challenges arising from the inclusion of magnetic molecules in conjunction with competing defects. Molecular device channels are covalently bonded between two ferromagnets across the insulating barrier. An insulating barrier may possess a variety of potential defects arising during the fabrication or operational phase. This paper describes an experimental and theoretical study of molecular coupling between ferromagnets in the presence of the competing coupling via an insulating tunnel barrier. We discuss the experimental observations of hillocks and pinhole-type defects producing inter-layer coupling that compete with molecular device elements. We performed theoretical simulations to encompass a wide range of competition between molecules and defects. Monte Carlo Simulation (MCS) was used for investigating the defect-induced inter-layer coupling on MTJMSD. Our research may help understand and design molecular spintronics devices utilizing various insulating spacers such as aluminum oxide (AlOx) and magnesium oxide (MgO) on a wide range of metal electrodes. This paper intends to provide practical insights for researchers intending to investigate the molecular device properties via the MTJMSD approach and do not have a background in magnetic tunnel junction fabrication.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Molecular coupling competing with defects within insulator of the magnetic tunnel junction-based molecular spintronics devices

Tyagi

Brown

Grizzle

et al. 2021

Sci Rep

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“…As a continuation of our interest in investigating biomolecule-based complexes of several metal ions [ 13 , 14 , 15 , 16 , 17 ] and their implementation in devices [ 18 , 19 ], we have studied the synthesis of ruthenium with some purine-based compounds that either contain hypoxanthine or could generate this analyte. Thus, we have investigated the products of the hydrolysis reactions with inosine and azathioprine ( Scheme 1 ).…”

Section: Introductionmentioning

confidence: 99%

Detection of Hypoxanthine from Inosine and Unusual Hydrolysis of Immunosuppressive Drug Azathioprine through the Formation of a Diruthenium(III) System

2021

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Hypoxanthine (hpx) is an important molecule for both biochemistry research and biomedical applications. It is involved in several biological processes associated to energy and purine metabolism and has been proposed as a biomarker for a variety of disease states. Consequently, the discovery and development of systems suitable for the detection of hypoxanthine is pretty appealing in this research field. Thus, we have obtained a stable diruthenium (III) compound in its dehydrated and hydrated forms with formula [{Ru(µ-Cl)(µ-hpx)}2Cl4] (1a) and [{Ru(µ-Cl)(µ-hpx)}2Cl4]·2H2O (1b), respectively. This purine-based diruthenium(III) system was prepared from two very different starting materials, namely, inosine and azathioprine, the latter being an immunosuppressive drug. Remarkably, it was observed that an unusual azathioprine hydrolysis occurs in the presence of ruthenium, thus generating hypoxanthine instead of the expected 6-mercaptopurine antimetabolite, so that the hpx molecule is linked to two ruthenium(III) ions. 1a and 1b were characterized through IR, SEM, powder and single-crystal X-ray Diffraction and Cyclic Voltammetry (CV). The electrochemical studies allowed us to detect the hpx molecule when coordinated to ruthenium in the reported compound. The grade of sensitivity, repeatability and stability reached by this diruthenium system make it potentially useful and could provide a first step to develop new sensor devices suitable to detect hypoxanthine.

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Spin-dependent electron transport analysis of benzyl alcohol and p-cresol based single molecular junction: a DFT-NEGF approach

Arivazhagan

Jasmine

Mohanraj

et al. 2022

J Mater Sci: Mater Electron

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Exploring room-temperature transport of single-molecule magnet-based molecular spintronics devices using the magnetic tunnel junction as a device platform

Abstract: A device architecture utilizing a single-molecule magnet (SMM) as a device element between two ferromagnetic electrodes may open vast opportunities to create novel molecular spintronics devices.

Cited by 23 publications

References 33 publications

Molecular coupling competing with defects within insulator of the magnetic tunnel junction-based molecular spintronics devices

Molecular coupling competing with defects within insulator of the magnetic tunnel junction-based molecular spintronics devices

Detection of Hypoxanthine from Inosine and Unusual Hydrolysis of Immunosuppressive Drug Azathioprine through the Formation of a Diruthenium(III) System

Spin-dependent electron transport analysis of benzyl alcohol and p-cresol based single molecular junction: a DFT-NEGF approach

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