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Dahal BR, Savadkoohi M, Grizzle A, D'Angelo C, Lamberti V, Tyagi P. Easy axis anisotropy creating high contrast magnetic zones on magnetic tunnel junctions based molecular spintronics devices (MTJMSD). Sci Rep 2022; 12:5721. [PMID: 35388032 PMCID: PMC8986785 DOI: 10.1038/s41598-022-09321-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Accepted: 03/15/2022] [Indexed: 11/09/2022] Open
Abstract
Magnetic tunnel junction-based molecular spintronics device (MTJMSD) may enable novel magnetic metamaterials by chemically bonding magnetic molecules and ferromagnets (FM) with a vast range of magnetic anisotropy. MTJMSD have experimentally shown intriguing microscopic phenomenon such as the development of highly contrasting magnetic phases on a ferromagnetic electrode at room temperature. This paper focuses on Monte Carlo Simulations (MCS) on MTJMSD to understand the potential mechanism and explore fundamental knowledge about the impact of magnetic anisotropy. The selection of MCS is based on our prior study showing the potential of MCS in explaining experimental results (Tyagi et al. in Nanotechnology 26:305602, 2015). In this paper, MCS is carried out on the 3D Heisenberg model of cross-junction-shaped MTJMSDs. Our research represents the experimentally studied cross-junction-shaped MTJMSD where paramagnetic molecules are covalently bonded between two FM electrodes along the exposed side edges of the magnetic tunnel junction (MTJ). We have studied atomistic MTJMSDs properties by simulating a wide range of easy-axis anisotropy for the case of experimentally observed predominant molecule-induced strong antiferromagnetic coupling. Our study focused on understanding the effect of anisotropy of the FM electrodes on the overall MTJMSDs at various temperatures. This study shows that the multiple domains of opposite spins start to appear on an FM electrode as the easy-axis anisotropy increases. Interestingly, MCS results resembled the experimentally observed highly contrasted magnetic zones on the ferromagnetic electrodes of MTJMSD. The magnetic phases with starkly different spins were observed around the molecular junction on the FM electrode with high anisotropy.
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Affiliation(s)
- Bishnu R Dahal
- Center for Nanotechnology Research and Education, Mechanical Engineering, University of the District of Columbia, Washington, DC, 20008, USA
| | - Marzieh Savadkoohi
- Center for Nanotechnology Research and Education, Mechanical Engineering, University of the District of Columbia, Washington, DC, 20008, USA
| | - Andrew Grizzle
- Center for Nanotechnology Research and Education, Mechanical Engineering, University of the District of Columbia, Washington, DC, 20008, USA
| | - Christopher D'Angelo
- Center for Nanotechnology Research and Education, Mechanical Engineering, University of the District of Columbia, Washington, DC, 20008, USA
| | - Vincent Lamberti
- Y-12 National Security Complex, 301 Bear Creek Rd, Oak Ridge, TN, 37830, USA
| | - Pawan Tyagi
- Center for Nanotechnology Research and Education, Mechanical Engineering, University of the District of Columbia, Washington, DC, 20008, USA.
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Savadkoohi M, D'Angelo C, Grizzle A, Dahal B, Tyagi P. Spatial Influence of Paramagnetic Molecules on Magnetic Tunnel Junction-Based Molecular Spintronic Devices (MTJMSD). Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Tyagi P, Riso C, Amir U, Rojas-Dotti C, Martínez-Lillo J. Exploring room-temperature transport of single-molecule magnet-based molecular spintronics devices using the magnetic tunnel junction as a device platform. RSC Adv 2020; 10:13006-13015. [PMID: 35492095 PMCID: PMC9051408 DOI: 10.1039/c9ra09003g] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 03/11/2020] [Indexed: 11/21/2022] Open
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. Here, we report a method of connecting an SMM to the ferromagnetic electrodes. We utilized a nickel (Ni)–AlOx–Ni magnetic tunnel junction (MTJ) with the exposed side edges as a test bed. In the present work, we utilized an SMM with a hexanuclear [Mn6(μ3-O)2(H2N-sao)6(6-atha)2(EtOH)6] [H2N-saoH = salicylamidoxime, 6-atha = 6-acetylthiohexanoate] complex that is attached to alkane tethers terminated with thiols. These Mn-based molecules were electrochemically bonded between the two Ni electrodes of an exposed-edge tunnel junction, which was produced by the lift-off method. The SMM-treated MTJ exhibited current enhancement and transitory current suppression at room temperature. Monte Carlo simulation was utilized to understand the transport properties of our molecular spintronics device. 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.![]()
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Affiliation(s)
- Pawan Tyagi
- Department of Mechanical Engineering
- University of the District of Columbia
- Washington DC-20008
- USA
| | - Christopher Riso
- Department of Mechanical Engineering
- University of the District of Columbia
- Washington DC-20008
- USA
| | - Uzma Amir
- Department of Mechanical Engineering
- University of the District of Columbia
- Washington DC-20008
- USA
| | - Carlos Rojas-Dotti
- Instituto de Ciencia Molecular (ICMol)
- Universitat de València
- 46980 Paterna
- Spain
| | - Jose Martínez-Lillo
- Instituto de Ciencia Molecular (ICMol)
- Universitat de València
- 46980 Paterna
- Spain
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Khatir NM, Banihashemian SM, Periasamy V, Ritikos R, Majid WHA, Rahman SA. Electrical characterization of gold-DNA-gold structures in presence of an external magnetic field by means of I-V curve analysis. SENSORS (BASEL, SWITZERLAND) 2012; 12:3578-3586. [PMID: 22737025 PMCID: PMC3376582 DOI: 10.3390/s120303578] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2012] [Revised: 03/01/2012] [Accepted: 03/03/2012] [Indexed: 12/03/2022]
Abstract
This work presents an experimental study of gold-DNA-gold structures in the presence and absence of external magnetic fields with strengths less than 1,200.00 mT. The DNA strands, extracted by standard method were used to fabricate a Metal-DNA-Metal (MDM) structure. Its electric behavior when subjected to a magnetic field was studied through its current-voltage (I-V) curve. Acquisition of the I-V curve demonstrated that DNA as a semiconductor exhibits diode behavior in the MDM structure. The current versus magnetic field strength followed a decreasing trend because of a diminished mobility in the presence of a low magnetic field. This made clear that an externally imposed magnetic field would boost resistance of the MDM structure up to 1,000.00 mT and for higher magnetic field strengths we can observe an increase in potential barrier in MDM junction. The magnetic sensitivity indicates the promise of using MDM structures as potential magnetic sensors.
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Affiliation(s)
- Nadia Mahmoudi Khatir
- Low Dimensional Materials Research Centre, Department of Physics, University of Malaya, 50603, Kuala Lumpur, Malaysia; E-Mails: (V.P.); (R.R.); (W.H.A.M.); (S.A.R.)
| | - Seyedeh Maryam Banihashemian
- Low Dimensional Materials Research Centre, Department of Physics, University of Malaya, 50603, Kuala Lumpur, Malaysia; E-Mails: (V.P.); (R.R.); (W.H.A.M.); (S.A.R.)
| | - Vengadesh Periasamy
- Low Dimensional Materials Research Centre, Department of Physics, University of Malaya, 50603, Kuala Lumpur, Malaysia; E-Mails: (V.P.); (R.R.); (W.H.A.M.); (S.A.R.)
| | - Richard Ritikos
- Low Dimensional Materials Research Centre, Department of Physics, University of Malaya, 50603, Kuala Lumpur, Malaysia; E-Mails: (V.P.); (R.R.); (W.H.A.M.); (S.A.R.)
| | - Wan Haliza Abd Majid
- Low Dimensional Materials Research Centre, Department of Physics, University of Malaya, 50603, Kuala Lumpur, Malaysia; E-Mails: (V.P.); (R.R.); (W.H.A.M.); (S.A.R.)
| | - Saadah Abdul Rahman
- Low Dimensional Materials Research Centre, Department of Physics, University of Malaya, 50603, Kuala Lumpur, Malaysia; E-Mails: (V.P.); (R.R.); (W.H.A.M.); (S.A.R.)
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Petrov EG, Zelinskii YR, Hänggi P. Nonlinear Properties of an Inter-Electrode Current Through a Short Molecular Wire. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587250108025740] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Elmar G. Petrov
- a Bogolyubov Institute for Theoretical Physics, Ukrainian National Academy of Science , 14-b Metrologichna street., UA-03143 , Kiev , Ukraine
| | - Yaroslav R. Zelinskii
- a Bogolyubov Institute for Theoretical Physics, Ukrainian National Academy of Science , 14-b Metrologichna street., UA-03143 , Kiev , Ukraine
| | - Peter Hänggi
- b Institut für Physik, Universität Augsburg , Universitätsstr. 1, D-86135 , Augsburg , F.R. Germany
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Petrov E, May V, Hänggi P. Spin-boson description of electron transmission through a molecular wire. Chem Phys 2004. [DOI: 10.1016/j.chemphys.2003.09.021] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Emberly EG, Kirczenow G. Molecular spintronics: spin-dependent electron transport in molecular wires. Chem Phys 2002. [DOI: 10.1016/s0301-0104(02)00566-9] [Citation(s) in RCA: 113] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Robert V. Electron Tunneling: A Scattering Problem and a Chemical Approach. Interpretation of STM O2 Image. J Phys Chem A 1999. [DOI: 10.1021/jp990488u] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- V. Robert
- Institut de Recherches sur la Catalyse, UPR 5402, 2, avenue Albert Einstein, 69626 Villeurbanne Cedex, France, Ecole normale supérieure de Lyon, Laboratoire de Chimie Théorique, 46, allée d'Italie, 69364 Lyon Cedex 07, France, and Université Claude Bernard de Lyon I, 43, boulevard du 11 novembre 1918, 69622 Villeurbanne Cedex, France
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Petrov EG, Tolokh IS, May V. The magnetic-field influence on the inelastic electron tunnel current mediated by a molecular wire. J Chem Phys 1998. [DOI: 10.1063/1.477618] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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