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

Sunjae Chung, Anders Eklund, Ezio Iacocca, Seyed Majid Mohseni, Sohrab R. Sani, Lake Bookman, Mark A. Hoefer, Randy K. Dumas and Johan Åkerman ()
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Sunjae Chung: University of Gothenburg
Anders Eklund: Integrated Devices and Circuits, School of ICT, KTH-Royal Institute of Technology
Ezio Iacocca: University of Gothenburg
Seyed Majid Mohseni: Shahid Beheshti University
Sohrab R. Sani: Materials and Nano Physics, School of ICT, KTH-Royal Institute of Technology
Lake Bookman: Yale University, New Haven
Mark A. Hoefer: Shahid Beheshti University
Randy K. Dumas: University of Gothenburg
Johan Åkerman: University of Gothenburg

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract 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.

Date: 2016
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DOI: 10.1038/ncomms11209

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