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Newly discovered altermagnets are magnetic materials exhibiting bothcompensated magnetic order, similar to antiferromagnets, and simultaneousnon-relativistic spin-splitting of the bands, akin to ferromagnets. Thischaracteristic arises from the specific symmetry operations that connect thespin sublattices. In this report, we show with ab initio calculations that thesemiconductive MnSe exhibits altermagnetic spin-splitting in the wurtzite phaseas well as a critical temperature well above room temperature. It is the firstmaterial from such space group identified to possess altermagnetic properties.Furthermore, we demonstrate experimentally through structural characterizationtechniques that it is possible to obtain thin films of both the intriguingwurtzite phase of MnSe and the more common rock-salt MnSe using molecular beamepitaxy on GaAs substrates. The choice of buffer layers plays a crucial role indetermining the resulting phase and consequently extends the array of materialsavailable for the physics of altermagnetism.

Wurtzite vs rock-salt MnSe epitaxy: electronic and altermagnetic properties