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Long-range magnetic interactions and proximity effects in an amorphous exchange-spring magnet
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics. Univ Iceland, Inst Sci, Dunhaga 3, IS-107 Reykjavik, Iceland..
UCL, Dept Chem, 20 Gordon St, London WC1H 0AJ, England..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics. Univ Hassan II Casablanca, Fac Sci Ain Chock, LPMMAT, Maarif BP 5366, Rabat, Morocco..
Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England..
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2016 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 7, 11931Article in journal (Refereed) PublishedText
Abstract [en]

Low-dimensional magnetic heterostructures are a key element of spintronics, where magnetic interactions between different materials often define the functionality of devices. Although some interlayer exchange coupling mechanisms are by now well established, the possibility of direct exchange coupling via proximity-induced magnetization through non-magnetic layers is typically ignored due to the presumed short range of such proximity effects. Here we show that magnetic order can be induced throughout a 40-nm-thick amorphous paramagnetic layer through proximity to ferromagnets, mediating both exchange-spring magnet behaviour and exchange bias. Furthermore, Monte Carlo simulations show that nearest-neighbour magnetic interactions fall short in describing the observed effects and long-range magnetic interactions are needed to capture the extent of the induced magnetization. The results highlight the importance of considering the range of interactions in low-dimensional heterostructures and how magnetic proximity effects can be used to obtain new functionality.

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2016. Vol. 7, 11931
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Other Physics Topics
URN: urn:nbn:se:uu:diva-299738DOI: 10.1038/ncomms11931ISI: 000378390000001OAI: diva2:949980
Swedish Research CouncilKnut and Alice Wallenberg FoundationCarl Tryggers foundation The Swedish Foundation for International Cooperation in Research and Higher Education (STINT)
Available from: 2016-07-26 Created: 2016-07-26 Last updated: 2016-07-26Bibliographically approved

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Magnus, FridrikAndersson, GabriellaHjörvarsson, Björgvin
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