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Using Magnetic Droplet Nucleation to Determine the Spin Torque Efficiency and Asymmetry in Co-x(Ni,Fe)(1-x) Thin Films
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- Jiang, Sheng (author)
- KTH,Tillämpad fysik,NanOsc AB, S-16440 Kista, Sweden
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- Chung, Sunjae (author)
- KTH,Uppsala universitet,Institutionen för fysik och astronomi,KTH Royal Inst Technol, Sch Engn Sci, Dept Appl Phys, Electrum 229, SE-16440 Kista, Sweden,Tillämpad fysik,Uppsala Univ, Dept Phys & Astron, S-75120 Uppsala, Sweden.
- Le, Q. T. (author)
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- AMER PHYSICAL SOC, 2018
- 2018
- English.
- In: Physical Review Applied. - : AMER PHYSICAL SOC. - 2331-7019. ; 10:5
- Journal article (peer-reviewed)
Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Annan teknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Other Engineering and Technologies (hsv//eng)
Keyword
- nano-oscillators
- multilayers
- waves
- excitation
- anisotropy
- solitons
- driven
- Physics
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- ref (subject category)
- art (subject category)
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- NATURAL SCIENCES
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