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Magnetostatically driven domain replication in Ni/Co based perpendicular pseudo-spin-valves

Journal article
Authors S. M. Mohseni
M. Hamdi
S. Chung
S. R. Sani
Johan Åkerman
Published in Journal of Physics D-Applied Physics
Volume 49
Issue 41
ISSN 0022-3727
Publication year 2016
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1088/0022-3727/49/41/...
Keywords spintonics, perpendicular spin valve, magnetostatic coupling, domain replication, magnetic droplet solitons, ferromagnetic-resonance, temperature-dependence, torque oscillators, anisotropy, films, multilayers, field, layers, Physics
Subject categories Physical Sciences

Abstract

The effect of ferromagnetic layer thickness on the temperature-dependent stray-field-induced coupling mechanism is investigated in perpendicular pseudo-spin-valves based on [Ni/Co](5)/ Cu/Co-[Ni/Co](n) (n = 2, 3, 4, and 5). Experimental observations show that as n increases from 2 to 4, the difference in coercivity and anisotropy between the two ([Ni/Co](5) or bottom-layer, and [Ni/Co](n) or top-layer) layers increases and the room temperature coupling strength decreases. The coupling then increases for n = 5, as the coercivity difference shrinks and anisotropy decreases. At reduced temperature, the layers start to decouple at a temperature, which increases with n from 2 to 4 and decreases for n = 5 via a stray-field domain-replication mechanism. Our results are useful to control the coupling in pseudo-spin-valves for practical applications in magnetoresistive devices.

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