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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
KTH, School of Engineering Sciences (SCI), Applied Physics. NanOsc AB, S-16440 Kista, Sweden.ORCID iD: 0000-0003-1909-437x
KTH, School of Engineering Sciences (SCI), Applied Physics. Uppsala Univ, Dept Phys & Astron, S-75120 Uppsala, Sweden..
KTH, School of Engineering Sciences (SCI), Applied Physics. NanOsc AB, S-16440 Kista, Sweden..ORCID iD: 0000-0003-3605-8872
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2018 (English)In: Physical Review Applied, E-ISSN 2331-7019, Vol. 10, no 5, article id 054014Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
American Physical Society, 2018. Vol. 10, no 5, article id 054014
National Category
Other Engineering and Technologies
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URN: urn:nbn:se:kth:diva-239480DOI: 10.1103/PhysRevApplied.10.054014ISI: 000449411000004OAI: oai:DiVA.org:kth-239480DiVA, id: diva2:1266188
Funder
Swedish Foundation for Strategic Research Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note

QC 29181127

Available from: 2018-11-27 Created: 2018-11-27 Last updated: 2019-08-20Bibliographically approved

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Jiang, ShengChung, SunjaeMazraati, HamidÅkerman, Johan

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