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Domain structures and magnetization reversal in Co/Pd and CoFeB/Pd multilayers
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF. University of Gothenburg, Sweden.ORCID iD: 0000-0002-3513-6608
2015 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 117, no 17, 17C102Article in journal (Refereed) Published
Abstract [en]

Domain structures and magnetization reversal of (Co/Pd) and (CoFeB/Pd) multilayers with 7 and 14 repeats were investigated. The Co-based multilayers show much larger coercivities, a better squareness, and a sharper magnetization switching than CoFeB-based multilayers. From magnetic force microscopy observations, both structures show strong reduction in domains size as the number of repeats increases but the magnetic domains for Co-based multilayers are more than one order of magnitude larger than for CoFeB-based multilayers. By imaging domains at different times, breaks in the (CoFeB/Pd) multilayer stripes were observed within only few hours, while no change could be seen for (Co/Pd) multilayers. Although CoFeB single layers are suitable for magnetoresistive devices due to their large spin polarization and low damping constants, their lamination with Pd suffers mainly from thermal instability.

Place, publisher, year, edition, pages
2015. Vol. 117, no 17, 17C102
Keyword [en]
Cobalt compounds, Magnetic domains, Magnetic multilayers, Magnetization, Magnetization reversal, Spin polarization, Thermodynamic stability, Coercivities, Damping constants, Domain structure, Large spin, Magnetization switching, Magnetoresistive devices, Single layer, Thermal instabilities
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URN: urn:nbn:se:kth:diva-166931DOI: 10.1063/1.4906281ISI: 000354984100234ScopusID: 2-s2.0-84923668977OAI: diva2:818566
Swedish Foundation for Strategic Research Swedish Research CouncilKnut and Alice Wallenberg Foundation

QC 20150609

Available from: 2015-06-09 Created: 2015-05-21 Last updated: 2015-08-17Bibliographically approved

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Åkerman, Johan
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