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High frequency operation of a spin‐torque oscillator at low field
Author(s) -
Mohseni S. M.,
Sani S. R.,
Persson J.,
Anh Nguyen T. N.,
Chung S.,
Pogoryelov Ye.,
Åkerman Johan
Publication year - 2011
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201105375
Subject(s) - polarizer , torque , anisotropy , magnetization , condensed matter physics , spin (aerodynamics) , magnetic field , saturation (graph theory) , materials science , spin valve , field (mathematics) , physics , optoelectronics , optics , quantum mechanics , mathematics , thermodynamics , birefringence , combinatorics , pure mathematics
We demonstrate a nano‐contact based spin‐torque oscillator (STO) combining a high operating frequency with low field operation. The STO is based on an orthogonal spin‐valve architecture with an in‐plane Co polarizer and an out‐of‐plane Co/Ni multilayer free layer. High frequency operation at low external fields is achieved by tailoring the Co/Ni layer properties to increase the strength ( H k ) of the perpendicular magnetic anisotropy, while simultaneously reducing the saturation magnetization ( M s ). Our approach emphasizes the importance of μ 0 ( H k –M s ) in determining the operating frequency in this system, and suggests that yet higher frequencies should be attainable through further optimization.(© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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