Vortex dynamics and frequency splitting in vertically coupled nanomagnets

Abstract 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....

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Autores principales:	M. E. Stebliy, S. Jain, A. G. Kolesnikov, A. V. Ognev, A. S. Samardak, A. V. Davydenko, E. V. Sukovatitcina, L. A. Chebotkevich, J. Ding, J. Pearson, V. Khovaylo, V. Novosad
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d77909fddd6f4ef3876d9de2d9ac7696
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spelling	oai:doaj.org-article:d77909fddd6f4ef3876d9de2d9ac76962021-12-02T12:32:30ZVortex dynamics and frequency splitting in vertically coupled nanomagnets10.1038/s41598-017-01222-42045-2322https://doaj.org/article/d77909fddd6f4ef3876d9de2d9ac76962017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01222-4https://doaj.org/toc/2045-2322Abstract 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.M. E. StebliyS. JainA. G. KolesnikovA. V. OgnevA. S. SamardakA. V. DavydenkoE. V. SukovatitcinaL. A. ChebotkevichJ. DingJ. PearsonV. KhovayloV. NovosadNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q M. E. Stebliy S. Jain A. G. Kolesnikov A. V. Ognev A. S. Samardak A. V. Davydenko E. V. Sukovatitcina L. A. Chebotkevich J. Ding J. Pearson V. Khovaylo V. Novosad Vortex dynamics and frequency splitting in vertically coupled nanomagnets
description	Abstract 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.
format	article
author	M. E. Stebliy S. Jain A. G. Kolesnikov A. V. Ognev A. S. Samardak A. V. Davydenko E. V. Sukovatitcina L. A. Chebotkevich J. Ding J. Pearson V. Khovaylo V. Novosad
author_facet	M. E. Stebliy S. Jain A. G. Kolesnikov A. V. Ognev A. S. Samardak A. V. Davydenko E. V. Sukovatitcina L. A. Chebotkevich J. Ding J. Pearson V. Khovaylo V. Novosad
author_sort	M. E. Stebliy
title	Vortex dynamics and frequency splitting in vertically coupled nanomagnets
title_short	Vortex dynamics and frequency splitting in vertically coupled nanomagnets
title_full	Vortex dynamics and frequency splitting in vertically coupled nanomagnets
title_fullStr	Vortex dynamics and frequency splitting in vertically coupled nanomagnets
title_full_unstemmed	Vortex dynamics and frequency splitting in vertically coupled nanomagnets
title_sort	vortex dynamics and frequency splitting in vertically coupled nanomagnets
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/d77909fddd6f4ef3876d9de2d9ac7696
work_keys_str_mv	AT mestebliy vortexdynamicsandfrequencysplittinginverticallycouplednanomagnets AT sjain vortexdynamicsandfrequencysplittinginverticallycouplednanomagnets AT agkolesnikov vortexdynamicsandfrequencysplittinginverticallycouplednanomagnets AT avognev vortexdynamicsandfrequencysplittinginverticallycouplednanomagnets AT assamardak vortexdynamicsandfrequencysplittinginverticallycouplednanomagnets AT avdavydenko vortexdynamicsandfrequencysplittinginverticallycouplednanomagnets AT evsukovatitcina vortexdynamicsandfrequencysplittinginverticallycouplednanomagnets AT lachebotkevich vortexdynamicsandfrequencysplittinginverticallycouplednanomagnets AT jding vortexdynamicsandfrequencysplittinginverticallycouplednanomagnets AT jpearson vortexdynamicsandfrequencysplittinginverticallycouplednanomagnets AT vkhovaylo vortexdynamicsandfrequencysplittinginverticallycouplednanomagnets AT vnovosad vortexdynamicsandfrequencysplittinginverticallycouplednanomagnets
_version_	1718394066125717504

Vortex dynamics and frequency splitting in vertically coupled nanomagnets

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