Magnetic droplet solitons in orthogonal nano-contact spin torque oscillators

Seyed Majid Mohseni, Sohrab R. Sani, Randy K. Dumas, Johan Persson, T. N. Anh Nguyen, Sunjae Chung, Ye. Pogoryelov, Pranaba K. Muduli, Ezio Iacocca, Anders Eklund, Johan Akerman

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)
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We study microwave signal generation as a function of drive current and applied perpendicular magnetic field in nano-contact spin torque oscillators (NC-STOs) based on orthogonal (pseudo) spin valves where the Co fixed layer has strong easy-plane anisotropy, and the [Co/Ni] free layer has a strong perpendicular magnetic anisotropy. The orthogonal NC-STOs exhibit a dramatic transition from the conventional ferromagnetic resonance-like spin wave mode to a magnetic droplet soliton mode. In particular, the field and current dependence of the droplet soliton near threshold are discussed. Near threshold the droplet soliton undergoes complex dynamics that include mode hopping, as evident in the experimental frequency domain and magnetoresistance response.
Original languageEnglish
Pages (from-to)84-87
JournalPhysica B: Condensed Matter
Publication statusPublished - 15 Feb 2014
Externally publishedYes


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