Magnetic droplet nucleation boundary in orthogonal spin-torque nano-oscillators
Journal article, 2016

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.


Sunjae Chung

University of Gothenburg

Anders Eklund

Royal Institute of Technology (KTH)

Ezio Iacocca

Chalmers, Physics, Condensed Matter Theory

Seyed Majid Mohseni

Shahid Beheshti University

Sohrab R. Sani

Royal Institute of Technology (KTH)

Lake Bookman

Yale University

M. A. Hoefer

Shahid Beheshti University

Randy K. Dumas

University of Gothenburg

Johan Åkerman

University of Gothenburg

Nature Communications

2041-1723 (ISSN) 20411723 (eISSN)

Vol. 7 artikel nr 11209- 11209

Subject Categories

Nano Technology

Computer Systems

Condensed Matter Physics



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