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  • Jiang, Sheng, et al. (author)
  • Using Magnetic Droplet Nucleation to Determine the Spin Torque Efficiency and Asymmetry in Co-x(Ni,Fe)(1-x) Thin Films
  • 2018
  • In: Physical Review Applied. - : AMER PHYSICAL SOC. - 2331-7019. ; 10:5
  • Journal article (peer-reviewed)abstract
    • We demonstrate how to extract the material-dependent spin-torque efficiency (epsilon) and asymmetry (lambda) from the field-current nucleation boundaries of magnetic droplet solitons in orthogonal nano-contact spintorque oscillators with Co-x(Ni80Fe20)(1-x), (x = 0 -1), fixed layers. As the perpendicular component of the fixed-layer magnetization plays a central role in governing droplet nucleation, the nucleation boundaries exhibit monotonic shifts towards higher perpendicular magnetic fields when the fixed-layer magnetization mu M-0(s, p) is tuned from 1.04 to 1.7 T. We then extract epsilon and lambda from fits to the nucleation boundaries and find that while epsilon does not vary with composition,lambda increases from 1.5 to 3 with increasing Co content. The analysis of droplet nucleation boundaries is hence a useful tool for the systematic study of both epsilon and lambda as functions of material composition.
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Type of publication
journal article (1)
Type of content
peer-reviewed (1)
Author/Editor
Mazraati, Hamid, Ind ... (1)
Åkerman, Johan, 1970 (1)
Houshang, Afshin (1)
Chung, Sunjae (1)
Jiang, Sheng (1)
Le, Q. T. (1)
University
University of Gothenburg (1)
Royal Institute of Technology (1)
Uppsala University (1)
Language
English (1)
Research subject (UKÄ/SCB)
Natural sciences (1)
Engineering and Technology (1)
Year
2018 (1)

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