Micromagnetic study of minimum-energy dissipation during Landauer erasure of either isolated or coupled nanomagnetic switches (Articolo in rivista)

Type
Label
  • Micromagnetic study of minimum-energy dissipation during Landauer erasure of either isolated or coupled nanomagnetic switches (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.90.104405 (literal)
Alternative label
  • Madami, M.; d'Aquino, M.; Gubbiotti, G.; Tacchi, S.; Serpico, C.; Carlotti, G. (2014)
    Micromagnetic study of minimum-energy dissipation during Landauer erasure of either isolated or coupled nanomagnetic switches
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Madami, M.; d'Aquino, M.; Gubbiotti, G.; Tacchi, S.; Serpico, C.; Carlotti, G. (literal)
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  • 90 (literal)
Rivista
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  • 8 (literal)
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  • 10 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • University of Perugia; Univ Napoli Parthenope; Consiglio Nazionale delle Ricerche (CNR); University of Naples Federico II (literal)
Titolo
  • Micromagnetic study of minimum-energy dissipation during Landauer erasure of either isolated or coupled nanomagnetic switches (literal)
Abstract
  • The question of the minimum energy required to change the information content of physical switches is attracting a growing interest because current computer technology is facing fundamental challenges, such as increased power dissipation, and rapidly approaching the limits of scaling. In this context, bistable nanomagnetic switches can be used to store bits of information, associating each logic state to a different equilibrium orientation of the magnetization. Here we present the results of virtual experiments implemented by micromagnetic simulations on elongated dots of Permalloy, performing a reset to 1 operation, also known as Landauer erasure. We show that for isolated, realistic, elliptical dots with sub-100 nm lateral dimension, the minimum-energy consumption turns out to be consistent with the value expected for an ideal bistable switch, i.e., E = k(B)T x ln(2), known as the Landauer limit. The only condition to achieve the correct limit is that the adopted erasure protocol includes a proper time interval where the probability distribution of the magnetization has the same amplitude in the two possible states. However, it is shown that significant deviations from the theoretical limit can be found either increasing the lateral dot dimension above about 100 nm or considering a rectangular (rather than elliptical) dot shape, where the presence of straight edges promotes a nonuniform behavior of the dot magnetization. Finally, we show that if the magnetic switch is not isolated, as it happens in potential devices where a regular array of dots is present, the dipolar interaction among adjacent switches can lead to either a reduction or an increase of the minimum dissipated energy, depending on the specific geometric arrangement of the magnetic dots. (literal)
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