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Dynamical Negative Differential Resistance in Antiferromagnetically Coupled Few-Atom Spin Chains

MPG-Autoren
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Rolf-Pissarczyk,  S.
Dynamics of Nanoelectronic Systems, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Max Planck Institute for Solid State Research;

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Yan,  S.
Dynamics of Nanoelectronic Systems, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Max Planck Institute for Solid State Research;
School of Physical Science and Technology, Shanghai Tech University;

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Malavolti,  L.
Dynamics of Nanoelectronic Systems, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Max Planck Institute for Solid State Research;

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Burgess,  J. A. J.
Dynamics of Nanoelectronic Systems, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Max Planck Institute for Solid State Research;
Department of Physics and Astronomy, University of Manitoba, Winnipeg;

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McMurtrie,  G.
Dynamics of Nanoelectronic Systems, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Max Planck Institute for Solid State Research;

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Loth,  S.
Dynamics of Nanoelectronic Systems, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Max Planck Institute for Solid State Research;
University of Stuttgart - Institute for Functional Matter and Quantum Technologies;

Externe Ressourcen

https://dx.doi.org/10.1103/PhysRevLett.119.217201
(Verlagsversion)

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PhysRevLett.119.217201.pdf
(Verlagsversion), 431KB

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Zitation

Rolf-Pissarczyk, S., Yan, S., Malavolti, L., Burgess, J. A. J., McMurtrie, G., & Loth, S. (2017). Dynamical Negative Differential Resistance in Antiferromagnetically Coupled Few-Atom Spin Chains. Physical Review Letters, 119(21): 217201. doi:10.1103/PhysRevLett.119.217201.


Zitierlink: https://hdl.handle.net/21.11116/0000-0001-98BB-1
Zusammenfassung
We present the appearance of negative differential resistance (NDR) in spin-dependent electron transport through a few-atom spin chain. A chain of three antiferromagnetically coupled Fe atoms (Fe trimer) was positioned on a Cu2N/Cu(100) surface and contacted with the spin-polarized tip of a scanning tunneling microscope, thus coupling the Fe trimer to one nonmagnetic and one magnetic lead. Pronounced NDR appears at the low bias of 7 mV, where inelastic electron tunneling dynamically locks the atomic spin in a long-lived excited state. This causes a rapid increase of the magnetoresistance between the spin-polarized tip and Fe trimer and quenches elastic tunneling. By varying the coupling strength between the tip and Fe trimer, we find that in this transport regime the dynamic locking of the Fe trimer competes with magnetic exchange interaction, which statically forces the Fe trimer into its high-magnetoresistance state and removes the NDR.