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Göteborgs universitets publikationer

Tunable permalloy-based films for magnonic devices

Författare och institution:
Yuli Yin (Institutionen för fysik (GU)); Fan Pan (-); Martina Ahlberg (Institutionen för fysik (GU)); Mojtaba Ranjbar (Institutionen för fysik (GU)); Philipp Dürrenfeld (Institutionen för fysik (GU)); Afshin Houshang (Institutionen för fysik (GU)); Mohammad Haidar (Institutionen för fysik (GU)); Lars Bergqvist (-); Ya Zhai (-); Randy K. Dumas (Institutionen för fysik (GU)); Anna Delin (-); Johan Åkerman (Institutionen för fysik (GU))
Publicerad i:
Physical Review B, 92 ( 2 ) s. Article Number: 024427
ISSN:
1098-0121
Publikationstyp:
Artikel, refereegranskad vetenskaplig
Publiceringsår:
2015
Språk:
engelska
Fulltextlänk:
Fulltextlänk (lokalt arkiv):
Sammanfattning (abstract):
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.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
NATURVETENSKAP ->
Fysik
Nyckelord:
SPIN-TORQUE OSCILLATORS, MAGNETIC DROPLET SOLITONS, FERROMAGNETIC-FILMS, ANISOTROPIC MAGNETORESISTANCE, NANO-OSCILLATORS, WAVES, DRIVEN, MULTILAYERS, ALLOYS, SPECTROSCOPY, Physics, Condensed Matter
Projekt:
Magnonics Using Spin Torque, spin caloritronics, And Nanoplasmonic engineerinG (MUSTANG) (EC/FP7/307144)
Postens nummer:
221303
Posten skapad:
2015-08-27 10:03
Posten ändrad:
2016-04-28 10:40

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