Temperature-induced coupled–decoupled transition in perpendicular pseudo spin valves. (14th February 2017)

• Record Type: Journal Article
• Authors: Hamdi, M; Mohseni, S M
• Is Part Of: Journal of physics. Volume 50:Number 11(2017)
• Publication Date: 2017-02-14
• Subjects: spintronics -- magnetostatic coupling -- domain replication -- pseudo-spin-valves -- MRAMs; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/aa5a72
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: The effect of spacer and ferromagnetic layer thickness on temperature-dependent magnetostatic coupling in perpendicular magnetic anisotropy pseudo spin valves (PMA-PSVs) with the structure of [Ni/Co]5 /Cu( d Cu )/[Ni/Co] n is explored theoretically. We introduce an effective field that controls the domain replication mechanism and coupling in PSVs. The decoupling temperature ( T decoupling ) can be determined by considering the temperature dependence of the effective field and the coercivity of the hard layer of the PSVs. This study reveals that by increasing the spacer layer thickness, the effective field decreases and T decoupling has an increasing trend. Furthermore, by increasing the hard ferromagnetic layer thickness, which is accompanied by an increase in the anisotropy of the layer, T decoupling again has an increasing trend. The results are comparable to recently reported experimental ones for PMA-PSVs with various spacer thicknesses, d Cu, and the number of bilayer repeats, n . As a practical result, this work gives a deep understanding of the magnetostatically driven domain replication mechanism and temperature-induced coupled–decoupled transitions in PMA-PSVs.