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

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

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Journal: Journal of Physics D: Applied Physics

Authors: S. M. Mohseni, M. Hamdi, S. Chung, S. R. Sani and Johan Åkerman

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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