A new reversal mode in exchange coupled antiferromagnetic/ferromagnetic disks: distorted viscous vortex

Gilbert, Dustin A.; Ye, Li; Varea, Aïda; Agramunt-Puig, Sebastià; del Valle, Nuria; Navau, Carles; López-Barbera, José Francisco; Buchanan, Kristen S.; Hoffmann, Axel; Sánchez, Alvar; Sort, Jordi; Liu, Kai; Nogués, Josep

doi:10.1039/c5nr01856k

Title: A new reversal mode in exchange coupled antiferromagnetic/ferromagnetic disks: distorted viscous vortex

Journal Article · Tue Apr 28 00:00:00 EDT 2015 · Nanoscale

DOI: https://doi.org/10.1039/c5nr01856k · OSTI ID:1214389

Gilbert, Dustin A. ^[1]; Ye, Li ^[1]; Varea, Aïda ^[2]; Agramunt-Puig, Sebastià ^[3]; del Valle, Nuria ^[3]; Navau, Carles ^[3]; López-Barbera, José Francisco ^[4]; Buchanan, Kristen S. ^[5]; Hoffmann, Axel ^[6]; Sánchez, Alvar ^[3]; Sort, Jordi ^[7]; Liu, Kai ^[1]; Nogués, Josep ^[8]

Univ. of California, Davis, CA (United States)
Universitat de Barcelona (Spain)
Univ. Autonoma de Barcelona, Bellaterra (Barcelona) (Spain)
Univ. Autonoma de Barcelona, Bellaterra (Barcelona) (Spain); ICN2 - Institut Catala de Nanociencia is Nanotechnologia, Bellaterra (Barcelona) (Spain)
Colorado State Univ., Fort Collins (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. Autonoma de Barcelona, Bellaterra (Barcelona) (Spain); Institucio Catalana de Recerca i Estudis Avancats (ICREA), Barcelona (Spain)
Univ. Autonoma de Barcelona, Bellaterra (Barcelona) (Spain); ICN2 - Institut Catala de Nanociencia is Nanotechnologia, Bellaterra (Barcelona) (Spain); Institucio Catalana de Recerca i Estudis Avancats (ICREA), Barcelona (Spain)

Magnetic vortices have generated intense interest in recent years due to their unique reversal mechanisms, fascinating topological properties, and exciting potential applications. In addition, the exchange coupling of magnetic vortices to antiferromagnets has also been shown to lead to a range of novel phenomena and functionalities. Here we report a new magnetization reversal mode of magnetic vortices in exchange coupled Ir₂₀Mn₈₀/Fe₂₀Ni₈₀ microdots: distorted viscous vortex reversal. In contrast to the previously known or proposed reversal modes, the vortex is distorted close to the interface and viscously dragged due to the uncompensated spins of a thin antiferromagnet, which leads to unexpected asymmetries in the annihilation and nucleation fields. Lastly, these results provide a deeper understanding of the physics of exchange coupled vortices and may also have important implications for applications involving exchange coupled nanostructures.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1214389

Journal Information:: Nanoscale, Journal Name: Nanoscale Journal Issue: 21 Vol. 7; ISSN NANOHL; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Title: A new reversal mode in exchange coupled antiferromagnetic/ferromagnetic disks: distorted viscous vortex

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