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Magnetostatically driven domain replication in Ni/Co based perpendicular pseudo-spin-valves
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics. Univ Gothenburg.
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.
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2016 (English)In: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 49, no 41, 415004Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2016. Vol. 49, no 41, 415004
Keyword [en]
spintonics, perpendicular spin valve, magnetostatic coupling, domain replication
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-196390DOI: 10.1088/0022-3727/49/41/415004ISI: 000385383400004Scopus ID: 2-s2.0-84996587453OAI: oai:DiVA.org:kth-196390DiVA: diva2:1050353
Note

QC 20161128

Available from: 2016-11-28 Created: 2016-11-14 Last updated: 2016-11-28Bibliographically approved

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