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Tunable permalloy-based films for magnonic devices
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2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 92, no 2, 024427Article in journal (Refereed) Published
Abstract [en]

Using both broadband ferromagnetic resonance (FMR) spectroscopy and ab initio calculations, we study the magnetodynamic properties of permalloy (Py, Ni80Fe20) and Py100-x M-x films with M as platinum (Pt), gold (Au), or silver (Ag). From the uniform FMR mode, we extract the saturation magnetization (M-S), damping (alpha), and inhomogeneous broadening (Delta H-0); from the first perpendicular standing spin-wave (PSSW) mode, we extract the exchange stiffness (A). M-S and A are found to decrease with increasing alloying, most strongly for Au and less so for Pt. On the other hand, alpha increases rapidly with both Pt and Au content, while being virtually independent of Ag content. The physical origins of the observed trends in alpha, M-S, and A are analyzed and explained using density functional theory calculations in the coherent potential approximation. The calculated trends quantitatively agree with the experimental observations. The drastically different impacts of Pt, Au, and Ag on the various fundamental magnetodynamic properties will allow for significant design freedom, where different properties can be varied independently of others through careful combinations of the Pt, Au, and Ag contents of Py100-x M-x films. By empirical approximations of each property's concentration dependence, we can dial in any desired combination of magnetodynamic properties within this parameter space. As a proof-of-principle demonstration we design a set of Py100-x-yPtxAgy films, where the saturation magnetization stays constant throughout the set and the damping can be tuned by a factor of 4.

Place, publisher, year, edition, pages
2015. Vol. 92, no 2, 024427
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-260839DOI: 10.1103/PhysRevB.92.024427ISI: 000358600300006OAI: oai:DiVA.org:uu-260839DiVA: diva2:848772
Göran Gustafsson Foundation for Research in Natural Sciences and MedicineKnut and Alice Wallenberg FoundationCarl Tryggers foundation Swedish Foundation for Strategic Research Swedish Research CouncilEU, European Research Council, 307144Swedish Energy Agency

Funding: China Scholarship Council (CSC)

Available from: 2015-08-26 Created: 2015-08-25 Last updated: 2015-08-26Bibliographically approved

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Delin, Anna
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