Magnetic droplet solitons in orthogonal nano-contact spin torque oscillators

Mohseni, S.M., Sani, S.R., Dumas, R.K., Persson, J., Anh Nguyen, T. N., Chung, S., Pogoryelov, Ye., Muduli, P.K., Iacocca, Ezio, Eklund, A. and Åkerman, J. (2014) Magnetic droplet solitons in orthogonal nano-contact spin torque oscillators. Physica B: Condensed Matter, 435. pp. 84-87. ISSN 0921-4526

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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.

Item Type: Article
Uncontrolled Keywords: Magnetic droplet soliton, Spin torque oscillators, Perpendicular magnetic anisotropy, Spin wave, Magnetoresistance
Subjects: F300 Physics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 09 Oct 2019 10:14
Last Modified: 31 Jul 2021 12:33

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