Long-range magnetic interactions and proximity effects in an amorphous exchange-spring magnet

Magnus, F.; Brooks-Bartlett, M. E.; Moubah, R.; Procter, R. A.; Andersson, G.; Hase, T. P.  A.; Banks, S. T.; Hjorvarsson, B.

doi:10.1038/ncomms11931

Title: Long-range magnetic interactions and proximity effects in an amorphous exchange-spring magnet

Journal Article · Mon Jun 13 00:00:00 EDT 2016 · Nature Communications

DOI:https://doi.org/10.1038/ncomms11931· OSTI ID:1287325

Magnus, F. ^[1]; Brooks-Bartlett, M. E. ^[2]; Moubah, R. ^[3]; Procter, R. A. ^[4];

^[5]; Hase, T. P. A. ^[4]; Banks, S. T. ^[2]; Hjorvarsson, B. ^[5]

Uppsala Univ., Uppsala (Sweden). Dept. of Physics and Astronomy; Univ. of Iceland, Reykjavik (Iceland). Science Inst.
Univ. College London, London (United Kingdom). Dept. of Chemistry
Uppsala Univ., Uppsala (Sweden). Dept. of Physics and Astronomy; Hassan II University in Casablanca, Faculty of Sciences-Ain Chock, Maarif (Morocco). LPMMAT
Univ. of Warwick, Coventry (United Kingdom). Dept. of Physics
Uppsala Univ., Uppsala (Sweden). Dept. of Physics and Astronomy

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. Lastly, 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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Research Organization:: Uppsala Univ., Uppsala (Sweden)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-98CH10886

OSTI ID:: 1287325

Journal Information:: Nature Communications, Vol. 7; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 54 works

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