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Magnetic droplet nucleation boundary in orthogonal spin-torque nano-oscillators

Sunjae Chung ; Anders Eklund ; Ezio Iacocca (Institutionen för fysik, Kondenserade materiens teori (Chalmers)) ; Seyed Majid Mohseni ; Sohrab Sani ; Lake Bookman ; Mark Hoefer ; Randy K. Dumas ; Johan Åkerman
Nature Communications (2041-1723). Vol. 7 (2016), p. artikel nr 11209.
[Artikel, refereegranskad vetenskaplig]

Static and dynamic magnetic solitons play a critical role in applied nanomagnetism. Magnetic droplets, a type of non-topological dissipative soliton, can be nucleated and sustained in nanocontact spin-torque oscillators with perpendicular magnetic anisotropy free layers. Here, we perform a detailed experimental determination of the full droplet nucleation boundary in the current–field plane for a wide range of nanocontact sizes and demonstrate its excellent agreement with an analytical expression originating from a stability analysis. Our results reconcile recent contradicting reports of the field dependence of the droplet nucleation. Furthermore, our analytical model both highlights the relation between the fixed layer material and the droplet nucleation current magnitude, and provides an accurate method to experimentally determine the spin transfer torque asymmetry of each device.



Denna post skapades 2016-04-26. Senast ändrad 2016-05-30.
CPL Pubid: 235198

 

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Institutioner (Chalmers)

Institutionen för fysik (GU) (GU)
Institutionen för fysik, Kondenserade materiens teori (Chalmers)

Ämnesområden

Magnetism
Datorsystem
Nanoteknik

Chalmers infrastruktur

 


Projekt

Denna publikation är ett resultat av följande projekt:


Magnonics Using Spin Torque, spin caloritronics, And Nanoplasmonic engineerinG (MUSTANG) (EC/FP7/307144)