Intra-molecular coupling within double-segmented molecules impacting magnetic tunnel junction-based molecular spintronics devices

Journal Article · 20 December 2023 · MRS communications

DOI: https://doi.org/10.1557/s43579-023-00508-1 · OSTI ID:2259249

Suh, Pius K. ^[1]; Grizzle, Andrew ^[1]; Mutunga, Eva ^[1]; Dahal, Bishnu ^[1]; D’Angelo, Christopher ^[1]; Tyagi, Pawan  ^[1]

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1. University of the District of Columbia, Washington, DC (United States)

The intra-molecular coupling within multiple units of paramagnetic molecules can produce various effects on molecular spintronics devices (MSD). Here, this paper focuses on double-segmented molecules as the device element to advance understanding of the Impact of internal molecular structure on magnetic tunnel junction-based MSD (MTJMSD). We performed Monte Carlo simulations (MCS) to fill the knowledge gap about the intramolecular coupling role in the magnetic properties of the MTJMSD. This study explored a double-segmented molecule containing two atomic sections, each with a net spin state interacting via Heisenberg exchange coupling within molecules and with ferromagnetic electrodes at different thermal energies, magnetic fields, and coupling strengths. This study also investigated the effect of magnetic field on the double-segmented molecule-based cross-junction-shaped MTJMSD. We also compared the effect of the magnetic field on the mono and double-segmented molecules when connected to two ferromagnetic electrodes. In the strong coupling regime, the intramolecular coupling and molecule coupling with the two ferromagnetic electrodes dominated the MTJMSD response near the molecular junction area. This study provides insight for evaluating the impact of molecular nanostructure internal connectedness on the integrated MSD.

• Research Organization: University of the District of Columbia, Washington, DC (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA); National Science Foundation-CREST; National Aeronautics and Space Administration (NASA)/ Minority University Research and Education Project (MURP)
• Grant/Contract Number: NA0003945; HRD-1914751; 80NSSC19M0196
• OSTI ID: 2259249
• Alternate ID(s): OSTI ID: 2281183
• Journal Information: MRS communications, Vol. 14; ISSN 2159-6867
• Publisher: Springer NatureCopyright Statement
• Country of Publication: United States
• Language: English