Room-temperature tunnel magnetoresistance across biomolecular tunnel junctions based on ferritin
Karuppannan, Senthil kumar (National University of Singapore. Department of Chemistry)
Pasula, Rupali Reddy (Nanyang Technological University. School of Chemical and Biomedical Engineering)
Herng, Tun Seng (National University of Singapore. Department of Materials Science and Engineering)
Ding, Jun (National University of Singapore. Department of Materials Science and Engineering)
Chi, Xiao (Singapore Synchrotron Light Source)
Del Barco, Enrique (University of Central Florida. Department of Physics)
Roche, Stephan (Institut Català de Nanociència i Nanotecnologia)
Yu, Xiaojiang (Singapore Synchrotron Light Source)
Yakovlev, Nikolai (Institute of Materials Research and Engineering (Singapur, Singapur))
Lim, Sierin (Nanyang Technological University. School of Chemical and Biomedical Engineering)
Nijhuis, Christian A. (University of Twente. Department of Molecules and Materials)

Data:	2021
Resum:	We report exceptionally large tunnel magnetoresistance (TMR) for biomolecular tunnel junctions based on ferritins immobilized between Ni and EGaIn electrodes. Ferritin stores iron in the form of ferrihydrite nanoparticles (NPs) and fulfills the following roles: (a) it dictates the tunnel barrier, (b) it magnetically decouples the NPs from the ferromagnetic (FM) electrode, (c) it stabilizes the NPs, and (d) it acts as a spin filter reducing the complexity of the tunnel junctions since only one FM electrode is required. The mechanism of charge transport is long-range tunneling which results in TMR of 60 ± 10% at 200 K and 25 ± 5% at room temperature. We propose a magnon-assisted transmission to explain the substantially larger TMR switching fields (up to 1 Tesla) than the characteristic coercive fields (a few Gauss) of ferritin ferrihydrite particles at T < 20 K. These results highlight the genuine potential of biomolecular tunnel junctions in designing functional nanoscale spintronic devices.
Ajuts:	Ministerio de Economía y Competitividad SEV-2017-0706
Nota:	Altres ajuts: ICN2 is funded by the CERCA programme/generalitat de Catalunya
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Ferritin ; Tunneling magnetoresistance ; Magnons ; EGaIn ; Biomolecular tunnel junction ; Ferromagnetic/molecule interface
Publicat a:	JPhys materials, Vol. 4, issue 3 (April 2021) , art. 035003, ISSN 2515-7639

DOI: 10.1088/2515-7639/abfa79

15 p, 1.5 MB

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