Reversible hydrogen control of antiferromagnetic anisotropy in α-Fe2O3
Journal Article
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· Nature Communications
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- National Univ. of Singapore (Singapore)
- National Univ. of Singapore (Singapore); Chang’an University, Xi’an (China)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Institute of Chemical and Engineering Sciences, Singapore (Singapore); Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
- National Univ. of Singapore (Singapore). Singapore Synchrotron Light Source
- National Univ. of Singapore (Singapore); SRM University-AP, Andhra Pradesh (India)
- Inter-University Accelerator Centre, New Delhi (India)
- Univ. of Oxford (United Kingdom). Clarendon Lab.
- Trinity College Dublin (Ireland)
Antiferromagnetic insulators are a ubiquitous class of magnetic materials, holding the promise of low-dissipation spin-based computing devices that can display ultra-fast switching and are robust against stray fields. However, their imperviousness to magnetic fields also makes them difficult to control in a reversible and scalable manner. Here we demonstrate a novel proof-of-principle ionic approach to control the spin reorientation (Morin) transition reversibly in the common antiferromagnetic insulator α-Fe2O3 (haematite) - now an emerging spintronic material that hosts topological antiferromagnetic spin-textures and long magnon-diffusion lengths. We use a low-temperature catalytic-spillover process involving the post-growth incorporation or removal of hydrogen from α-Fe2O3 thin films. Hydrogenation drives pronounced changes in its magnetic anisotropy, Néel vector orientation and canted magnetism via electron injection and local distortions. We explain these effects with a detailed magnetic anisotropy model and first-principles calculations. Tailoring our work for future applications, we demonstrate reversible control of the room-temperature spin-state by doping/expelling hydrogen in Rh-substituted α-Fe2O3.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- Engineering and Physical Sciences Research Council (EPSRC); Singapore National Research Foundation (NRF); USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1798789
- Journal Information:
- Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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