Vortex dynamics and frequency splitting in vertically coupled nanomagnets

Stebliy, M. E.; Jain, S.; Kolesnikov, A. G.; Ognev, A. V.; Samardak, A. S.; Davydenko, A. V.; Sukovatitcina, E. V.; Chebotkevich, L. A.; Ding, J.; Pearson, J.; Khovaylo, V.; Novosad, V.

doi:10.1038/s41598-017-01222-4

Title: Vortex dynamics and frequency splitting in vertically coupled nanomagnets

Journal Article · Tue Apr 25 00:00:00 EDT 2017 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-017-01222-4· OSTI ID:1352925

Stebliy, M. E. ^[1]; Jain, S. ^[2]; Kolesnikov, A. G. ^[1]; Ognev, A. V. ^[3]; Samardak, A. S. ^[3]; Davydenko, A. V. ^[1]; Sukovatitcina, E. V. ^[1]; Chebotkevich, L. A. ^[1]; Ding, J. ^[4]; Pearson, J. ^[4];

^[5]; Novosad, V. ^[4]

Far Eastern Federal Univ., Vladivostok (Russia)
Argonne National Lab. (ANL), Argonne, IL (United States); Western Digital, San Jose, CA (United States)
Far Eastern Federal Univ., Vladivostok (Russia); National Research South Ural State Univ., Chelyabinsk (Russia)
Argonne National Lab. (ANL), Argonne, IL (United States)
National Univ. of Science and Technology ("MISiS"), Moscow (Russia); National Research South Ural State Univ., Chelyabinsk (Russia)

Here, we explored the dynamic response of a vortex core in a circular nanomagnet by manipulating its dipole-dipole interaction with another vortex core confined locally on top of the nanomagnet. A clear frequency splitting is observed corresponding to the gyrofrequencies of the two vortex cores. The peak positions of the two resonance frequencies can be engineered by controlling the magnitude and direction of the external magnetic field. Both experimental and micromagnetic simulations show that the frequency spectra for the combined system is significantly dependent on the chirality of the circular nanomagnet and is asymmetric with respect to the external bias field. We attribute this result to the strong dynamic dipole-dipole interaction between the two vortex cores, which varies with the distance between them. The possibility of having multiple states in a single nanomagnet with vertical coupling could be of interest for magnetoresistive memories.

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

Sponsoring Organization:: Ministry of Education and Science of the Russian Federation; USDOE Office of Science (SC), Basic Energy Sciences (BES); Materials Sciences and Engineering Division; Russian Foundation for Basic Research

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1352925

Journal Information:: Scientific Reports, Vol. 7, Issue 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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Effects of asymmetry in strongly coupled spin vortex pairs Holmgren, E.; Persson, M.; Korenivski, V. Journal of Physics D: Applied Physics, Vol. 52, Issue 10 https://doi.org/10.1088/1361-6463/aaf8f7	journal	January 2019
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