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Giant magnetocaloric effect driven by indirect exchange in magnetic multilayers
KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics.ORCID iD: 0000-0001-5028-8928
KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics.
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2018 (English)In: PHYSICAL REVIEW MATERIALS, ISSN 2475-9953, Vol. 2, no 11, article id 114402Article in journal (Refereed) Published
Abstract [en]

Indirect exchange coupling in magnetic multilayers, also known as the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, is highly effective in controlling the interlayer alignment of the magnetization. This coupling is typically fixed at the stage of the multilayer fabrication and does not allow ex situ control needed for device applications. In addition to the orientational control, it is highly desirable to also control the magnitude of the intralayer magnetization, ideally, being able to switch it on/off by switching the relevant RKKY coupling. Here we demonstrate a magnetic multilayer material incorporating thermally and field-controlled RKKY exchange, focused on a dilute ferromagnetic alloy layer and driving it though its Curie transition. Such on/off magnetization switching of a thin ferromagnet, performed repeatedly and fully reproducibly within a low-field sweep, results in a giant magnetocaloric effect, with an estimated isothermal entropy change of Delta S approximate to -10 mJ cm(-3) K(-1 )under an external field of similar to 10 mT, which greatly exceeds the performance of the best rare-earth based materials used in the adiabatic-demagnetization refrigeration systems.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2018. Vol. 2, no 11, article id 114402
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Nano Technology
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URN: urn:nbn:se:kth:diva-239779DOI: 10.1103/PhysRevMaterials.2.114402ISI: 000450572600002Scopus ID: 2-s2.0-85060615826OAI: oai:DiVA.org:kth-239779DiVA, id: diva2:1276682
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QC 20190108

Available from: 2019-01-08 Created: 2019-01-08 Last updated: 2019-03-18Bibliographically approved

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Polishchuk, DmytrTykhonenko-Polishchuk, YuliyaHolmgren, ErikKravets, AnatoliiKorenivski, Vladislav

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