ISIS Neutron and Muon Source Data Journal

Altermagnetic Splitting through the Morin transition in Hematite

Abstract: Hematite, is an interesting platform in which to examine the interplay between altermagnetism and relativistic magnetic anisotropy. At the Morin transition, TM=255K, the Neel vector undergoes an approximately 90deg reorientation: below TM, the system is a collinear antiferromagnet with moments along the trigonal c-axis, whereas above TM the moments lie predominantly in the basal plane and acquire a small Dzyaloshinskii Moriya-induced canting, producing weak ferromagnetism. The transition reflects a delicate competition between single-ion, dipolar, exchange, and relativistic anisotropies. This makes the Morin transition particularly interesting from an altermagnetic perspective. We propose rapid access to MAPS for measuring the altermangnetic spin splitting through the Morin transition. We can use a high-resolution configuration and focus the measurements around 100meV transfer at the K-point. Measurements will be made at three temperatures: below, at and above TM to measure any changes in the energy scale or width of the splitting through the transition.

Local Contact: Dr Travis Williams
Experimenter: Dr Robin Perry

DOI: 10.5286/ISIS.E.RB2600061

ISIS Experiment Number: RB2600061

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Dr Travis Williams et al; (2026): Altermagnetic Splitting through the Morin transition in Hematite, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2600061

Data is released under the CC-BY-4.0 license.