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

Abstract

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.

Authors:
 [1];  [2];  [3];  [4]; ORCiD logo [5];  [4];  [2];  [5]
  1. Uppsala Univ., Uppsala (Sweden). Dept. of Physics and Astronomy; Univ. of Iceland, Reykjavik (Iceland). Science Inst.
  2. Univ. College London, London (United Kingdom). Dept. of Chemistry
  3. Uppsala Univ., Uppsala (Sweden). Dept. of Physics and Astronomy; Hassan II University in Casablanca, Faculty of Sciences-Ain Chock, Maarif (Morocco). LPMMAT
  4. Univ. of Warwick, Coventry (United Kingdom). Dept. of Physics
  5. Uppsala Univ., Uppsala (Sweden). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Uppsala Univ., Uppsala (Sweden)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1287325
Grant/Contract Number:  
AC02-98CH10886
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; classical critical-behavior; monte-carlo; spin models; films; temperatures; layers; order; bias

Citation Formats

Magnus, F., Brooks-Bartlett, M. E., Moubah, R., Procter, R. A., Andersson, G., Hase, T. P. A., Banks, S. T., and Hjorvarsson, B. Long-range magnetic interactions and proximity effects in an amorphous exchange-spring magnet. United States: N. p., 2016. Web. doi:10.1038/ncomms11931.
Magnus, F., Brooks-Bartlett, M. E., Moubah, R., Procter, R. A., Andersson, G., Hase, T. P. A., Banks, S. T., & Hjorvarsson, B. Long-range magnetic interactions and proximity effects in an amorphous exchange-spring magnet. United States. doi:10.1038/ncomms11931.
Magnus, F., Brooks-Bartlett, M. E., Moubah, R., Procter, R. A., Andersson, G., Hase, T. P. A., Banks, S. T., and Hjorvarsson, B. Mon . "Long-range magnetic interactions and proximity effects in an amorphous exchange-spring magnet". United States. doi:10.1038/ncomms11931. https://www.osti.gov/servlets/purl/1287325.
@article{osti_1287325,
title = {Long-range magnetic interactions and proximity effects in an amorphous exchange-spring magnet},
author = {Magnus, F. and Brooks-Bartlett, M. E. and Moubah, R. and Procter, R. A. and Andersson, G. and Hase, T. P. A. and Banks, S. T. and Hjorvarsson, B.},
abstractNote = {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.},
doi = {10.1038/ncomms11931},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {2016},
month = {6}
}

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