transparent gif


Ej inloggad.

Göteborgs universitets publikationer

Co/Pd -CoFeB exchange spring magnets with tunable gap of spin wave excitations

Författare och institution:
S. Tacchi (-); T N Anh Nguyen (-); G. Gubbiotti (-); M. Madami (-); G. Carlotti (-); M. G. Pini (-); A. Rettori (-); V. Fallahi (-); Randy K. Dumas (Institutionen för fysik (GU)); Johan Åkerman (Institutionen för fysik (GU))
Publicerad i:
Journal of Physics D-Applied Physics, 47 ( 49 )
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
Exchange spring magnets, consisting of a [Co(0.5 nm)/Pd(1 nm)](5) multilayer with perpendicular magnetic anisotropy and a Co20Fe60B20 film with easy plane anisotropy, of variable thickness t(CFB), are investigated using Brillouin light scattering. On reducing t(CFB) in the range 0.8-2.3 nm, the spin-wave frequency gap displays a remarkable increase from nearly 4-48 GHz, reflecting the corresponding rapid growth of the tilting angle of the magnetization with respect to the film normal. These findings are interpreted using a one-dimensional model in which each atomic layer is assumed to be uniformly magnetized, subjected to an effective out-of-plane or easy-plane anisotropy depending on the layer position in the stack, and exchange coupled to its two nearest neighbour atomic layers. With respect to previously investigated [Co/Pd]-NiFe hybrid magnets, a largest frequency tunability, restricted to a narrower range of the soft layer thickness, is observed.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
spin waves, brillouin light scattering, exchange springs, magnetic properties of interfaces, BRILLOUIN LIGHT-SCATTERING, TORQUE OSCILLATOR, PHASE-LOCKING, MAGNETIZATION, MULTILAYERS, SYSTEMS, DRIVEN, FILMS, FIELD, DEVICES, Physics, Applied
Postens nummer:
Posten skapad:
2015-01-22 13:15

Visa i Endnote-format

Göteborgs universitet • Tel. 031-786 0000
© Göteborgs universitet 2007