Reversible hydrogen control of antiferromagnetic anisotropy in α-Fe2O3

Hariom Jani (), Jiajun Linghu, Sonu Hooda, Rajesh V. Chopdekar, Changjian Li, Ganesh Ji Omar, Saurav Prakash, Yonghua Du, Ping Yang, Agnieszka Banas, Krzysztof Banas, Siddhartha Ghosh, Sunil Ojha, G. R. Umapathy, Dinakar Kanjilal, A. Ariando, Stephen J. Pennycook, Elke Arenholz, Paolo G. Radaelli, J. M. D. Coey, Yuan Ping Feng and T. Venkatesan ()
Additional contact information
Hariom Jani: National University of Singapore
Jiajun Linghu: National University of Singapore
Sonu Hooda: National University of Singapore
Rajesh V. Chopdekar: Advanced Light Source, Lawrence Berkeley National Laboratory
Changjian Li: National University of Singapore
Ganesh Ji Omar: National University of Singapore
Saurav Prakash: National University of Singapore
Yonghua Du: Institute of Chemical and Engineering Sciences
Ping Yang: National University of Singapore
Agnieszka Banas: National University of Singapore
Krzysztof Banas: National University of Singapore
Siddhartha Ghosh: National University of Singapore
Sunil Ojha: Inter-University Accelerator Centre
G. R. Umapathy: Inter-University Accelerator Centre
Dinakar Kanjilal: Inter-University Accelerator Centre
A. Ariando: National University of Singapore
Stephen J. Pennycook: National University of Singapore
Elke Arenholz: Advanced Light Source, Lawrence Berkeley National Laboratory
Paolo G. Radaelli: University of Oxford
J. M. D. Coey: Trinity College
Yuan Ping Feng: National University of Singapore
T. Venkatesan: National University of Singapore

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract 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.

Date: 2021
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DOI: 10.1038/s41467-021-21807-y

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