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Article

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Accepted version

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2014

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/159775

Stable magnetic droplet solitons in spin-transfer nanocontacts

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https://doi.org/10.1038/nnano.2014.255

Abstract

Magnetic thin films with perpendicular magnetic anisotropy (PMA) have localized excitations that correspond to reversed dynamically precessing magnetic moments, known as magnetic droplet solitons. Fundamentally, these excitations are associated with an attractive interaction between elementary spin-excitations (i.e., magnons) and were predicted to occur in PMA materials in the absence of damping [1, 2]. While damping, present in all magnetic materials, suppresses these excitations, it is now possible to compensate damping by spin transfer torques through electrical current flow in nanometer scale contacts to ferromagnetic thin films [3, 4]. A theory predicts the appearance of magnetic droplet solitons at a threshold current in nanocontacts [5] and, recently, experimental signatures of droplet nucleation have been reported [6]. However, thus far, they have been observed to be nearly reversible excitations, with only partially reversed magnetization and to be subject to instabilities that cause them to drift away from the nanocontacts (i.e., drift instabilities) [6]. Here we show that magnetic droplet solitons can be stabilized in a spin transfer nanocontact. Further, they exhibit a strong hysteretic response to fields and currents and a nearly fully reversed magnetization in the contact. These observations, in addition to their fundamental interest, open up new applications for magnetic droplet solitons as multi-state high frequency current and field tunable oscillators.

Subject

Spin (Física nuclear), Ferromagnetisme, Anisotropia, Pel·lícules fines

Subject (English)

Nuclear spin, Ferromagnetism, Anisotropy, Thin films

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Articles publicats en revistes (Física de la Matèria Condensada)
Publicacions de projectes de recerca finançats per la UE

Citation

MACIÀ BROS, Ferran, BACKES, D. and KENT, A. D. Stable magnetic droplet solitons in spin-transfer nanocontacts. Nature Nanotechnology. 2014. Vol. 9, num. 992-996. ISSN 1748-3387. [consulted: 13 of August of 2026]. Available at: https://hdl.handle.net/2445/159775

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