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

Journal article
Authors S. Tacchi
T N Anh Nguyen
G. Gubbiotti
M. Madami
G. Carlotti
M. G. Pini
A. Rettori
V. Fallahi
Randy K. Dumas
Johan Åkerman
Published in Journal of Physics D-Applied Physics
Volume 47
Issue 49
ISSN 0022-3727
Publication year 2014
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1088/0022-3727/47/49/...
Keywords 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
Subject categories Physical Sciences

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.

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