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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, Skolan för teknikvetenskap (SCI), Tillämpad fysik. NanOsc AB, S-16440 Kista, Sweden.ORCID-id: 0000-0003-1909-437x
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik. Uppsala Univ, Dept Phys & Astron, S-75120 Uppsala, Sweden..
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik. NanOsc AB, S-16440 Kista, Sweden..ORCID-id: 0000-0003-3605-8872
Vise andre og tillknytning
2018 (engelsk)Inngår i: Physical Review Applied, E-ISSN 2331-7019, Vol. 10, nr 5, artikkel-id 054014Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
American Physical Society, 2018. Vol. 10, nr 5, artikkel-id 054014
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Identifikatorer
URN: urn:nbn:se:kth:diva-239480DOI: 10.1103/PhysRevApplied.10.054014ISI: 000449411000004Scopus ID: 2-s2.0-85056299461OAI: oai:DiVA.org:kth-239480DiVA, id: diva2:1266188
Forskningsfinansiär
Swedish Foundation for Strategic Research Swedish Research CouncilKnut and Alice Wallenberg Foundation
Merknad

QC 29181127

Tilgjengelig fra: 2018-11-27 Laget: 2018-11-27 Sist oppdatert: 2020-03-09bibliografisk kontrollert

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