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Co/Pd (4)-Co-Pd-NiFe spring magnets with highly tunable and uniform magnetization tilt angles

Journal article
Authors T. N. A. Nguyen
N. Benatmane
V. Fallahi
Yeyu Fang
S. M. Mohseni
Randy K. Dumas
Johan Åkerman
Published in Journal of Magnetism and Magnetic Materials
Volume 324
Issue 22
Pages 3929-3932
ISSN 0304-8853
Publication year 2012
Published at Department of Physics (GU)
Pages 3929-3932
Language en
Keywords Exchange spring, Tilted spin polarizer, Competing magnetic anisotropy, spin-transfer torques, driven, layer, oscillator, anisotropy, reversal, valves, field
Subject categories Physical Sciences


By varying the Pd thickness (t(Pd)) from 0 to 8 nm in [Co/Pd](4)/Co/Pd(t(Pd))/NiFe exchange springs, we demonstrate (i) continuous tailoring of the exchange coupling between a [Co/Pd](4)/Co layer with perpendicular anisotropy, and a NiFe layer with an in-plane easy axis, (ii) tuning of the NiFe out-of-plane magnetization angle from 20 degrees to 80 degrees, and(iii) an up to two-fold increase in the NiFe damping. The partial decoupling also results in a highly uniform NiFe magnetization. These properties make [Co/Pd](4)/Co/Pd(t(Pd))/NiFe spring magnets ideal candidates for use as tilted polarizers, by combining stable and well-defined spin directions of its carriers with a high degree of angular freedom. (C) 2012 Elsevier B.V. All rights reserved.

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