Analysis of coupling strength in multi-domain magneto-systems

Nickvash Kani, Sourav Dutta, Azad Naeemi

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In recent years, novel devices which use nanomagnets to store and transmit information have been a particular topic of interest. Many of these devices utilize dipolar coupling between nanomagnets to process or communicate information and the most important factor when designing these systems is knowing if two nanomagnets are perfectly coupled [1]. However, when modeling these devices, these nanomagnets are typically modeled as single-domain objects even though in many cases, the magnet dimensions far exceed the exchange length [2]. While it is expected that very small magnets can be treated as single-domain objects, it is not quite clear how small is small enough. Second, it is not clear whether using a single-domain analysis underestimates or overestimates the coupling. In this work, we quantify the coupling between nanomagnets while considering their multi-domain behavior. Our simulations conclusively prove that ignoring multi-domain effects beyond a certain size yields inaccurate results. While the single-domain assumption predicts similar coupling strength to the multi-domain models for thin-film magnets with areas smaller than 1 μm2, the two models disagree about the coupling strength between larger magnets.

Original languageEnglish (US)
Title of host publication73rd Annual Device Research Conference, DRC 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages2
ISBN (Electronic)9781467381345
StatePublished - Aug 3 2015
Externally publishedYes
Event73rd Annual Device Research Conference, DRC 2015 - Columbus, United States
Duration: Jun 21 2015Jun 24 2015

Publication series

NameDevice Research Conference - Conference Digest, DRC
ISSN (Print)1548-3770


Other73rd Annual Device Research Conference, DRC 2015
Country/TerritoryUnited States


  • Demagnetization
  • Saturation magnetization

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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