Journal
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
Volume 5, Issue 12, Pages 432-434Publisher
WILEY-BLACKWELL
DOI: 10.1002/pssr.201105375
Keywords
spin-torque oscillators; perpendicular magnetic anisotropy; Co/Ni multilayers
Funding
- EC Contract [ICT-257159]
- Swedish Foundation for Strategic Research
- Swedish Research Council
- Knut and Alice Wallenberg Foundation
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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 mu(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. [GRAPHICS] (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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