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  Minimally invasive spin sensing with scanning tunneling microscopy

Malavolti, L., McMurtrie, G., Rolf-Pissarczyk, S., Yan, S., Burgess, J. A. J., & Loth, S. (2020). Minimally invasive spin sensing with scanning tunneling microscopy. Nanoscale, 12(21), 11619-11626. doi:10.1039/C9NR10252C.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-A323-A Version Permalink: http://hdl.handle.net/21.11116/0000-0006-A324-9
Genre: Journal Article

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https://dx.doi.org/10.1039/C9NR10252C (Publisher version)
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 Creators:
Malavolti, L.1, 2, 3, Author
McMurtrie, G.1, 2, 3, Author
Rolf-Pissarczyk, S.3, 4, Author              
Yan, S.2, 3, 5, Author
Burgess, J. A. J.2, 3, 6, Author
Loth, S.1, 2, 3, Author
Affiliations:
1Institute for Functional Matter and Quantum Technologies, University of Stuttgart, ou_persistent22              
2Dynamics of Nanoelectronic Systems, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_persistent22              
3Max Planck Institute for Solid State Research, Stuttgart, ou_persistent22              
4International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266714              
5School of Physical Science and Technology, ShanghaiTech University, ou_persistent22              
6Department of Physics and Astronomy, University of Manitoba, Winnipeg, ou_persistent22              

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 Abstract: Minimizing the invasiveness of scanning tunneling measurements is paramount for observation of the magnetic properties of unperturbed atomic-scale objects. We show that the invasiveness of STM inspection on few-atom spin systems can be drastically reduced by means of a remote detection scheme, which makes use of a sensor spin weakly coupled to the sensed object. By comparing direct and remote measurements we identify the relevant perturbations caused by the local probe. For direct inspection we find that tunneling electrons strongly perturb the investigated object even for currents as low as 3 pA. Electrons injected into the sensor spin induce perturbations with much reduced probability. The sensing scheme uses standard differential conductance measurements, and is decoupled both by its non-local nature, and by dynamic decoupling due to the significantly different time scales at which the sensor and sensed object evolve. The latter makes it possible to effectively remove static interactions between the sensed object and the spin sensor while still allowing the spin sensing. In this way we achieve measurements with a reduction in perturbative effects of up to 100 times relative to direct scanning tunneling measurements, which enables minimally invasive measurements of a few-atom magnet's fragile spin states with STM.

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Language(s): eng - English
 Dates: 2019-12-032020-04-132020-05-212020-06-07
 Publication Status: Published in print
 Pages: 8
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1039/C9NR10252C
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Title: Nanoscale
  Abbreviation : Nanoscale
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: 8 Volume / Issue: 12 (21) Sequence Number: - Start / End Page: 11619 - 11626 Identifier: ISSN: 2040-3364
CoNE: https://pure.mpg.de/cone/journals/resource/2040-3364