Stable magnetic droplet solitons in spin-transfer nanocontacts

Magnetic droplet solitons are shown to be stable excitations that can be controlled by applied magnetic fields and electrical currents in thin films with perpendicular magnetic anisotropy. Magnetic thin films with perpendicular magnetic anisotropy have localized excitations that correspond to revers...

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Veröffentlicht in:Nature nanotechnology Jg. 9; H. 12; S. 992 - 996
Hauptverfasser: Macià, Ferran, Backes, Dirk, Kent, Andrew D.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: London Nature Publishing Group UK 01.12.2014
Nature Publishing Group
Schlagworte:
142/126
147/135
639/925/357/997
639/925/927/1062
Anisotropy
Electric currents
Electrons
letter
Materials Science
Nanotechnology
Nanotechnology and Microengineering
Nucleation
Thin films
New York
United States > US
ISSN:1748-3387, 1748-3395, 1748-3395
Online-Zugang:Volltext
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Zusammenfassung:Magnetic droplet solitons are shown to be stable excitations that can be controlled by applied magnetic fields and electrical currents in thin films with perpendicular magnetic anisotropy. Magnetic thin films with perpendicular magnetic anisotropy have localized excitations that correspond to reversed, dynamically precessing magnetic moments, which are known as magnetic droplet solitons. Fundamentally, these excitations are associated with an attractive interaction between elementary spin-excitations and have been predicted to occur in perpendicularly magnetized materials in the absence of damping 1 , 2 . Although damping suppresses these excitations, it can be compensated by spin-transfer torques when an electrical current flows in nanocontacts to ferromagnetic thin films 3 , 4 . Theory predicts the appearance of magnetic droplet solitons in nanocontacts at a threshold current 5 and, recently, experimental signatures of droplet nucleation have been reported 6 . However, to date, these solitons have been observed to be nearly reversible excitations, with only partially reversed magnetization 6 . Here, we show that magnetic droplet solitons exhibit a strong hysteretic response in field and current, proving the existence of bistable states: droplet and non-droplet states. In the droplet soliton state we find that the magnetization in the contact is almost fully reversed. These observations, in addition to their fundamental interest, are important to understanding and controlling droplet motion, nucleation and annihilation 7 , 8 , 9 .
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:1748-3387
1748-3395
1748-3395
DOI:10.1038/nnano.2014.255