6 research outputs found
Wurtzite vs rock-salt MnSe epitaxy: electronic and altermagnetic properties
Newly discovered altermagnets are magnetic materials exhibiting both
compensated magnetic order, similar to antiferromagnets, and simultaneous
non-relativistic spin-splitting of the bands, akin to ferromagnets. This
characteristic arises from the specific symmetry operations that connect the
spin sublattices. In this report, we show with ab initio calculations that the
semiconductive MnSe exhibits altermagnetic spin-splitting in the wurtzite phase
as well as a critical temperature well above room temperature. It is the first
material from such space group identified to possess altermagnetic properties.
Furthermore, we demonstrate experimentally through structural characterization
techniques that it is possible to obtain thin films of both the intriguing
wurtzite phase of MnSe and the more common rock-salt MnSe using molecular beam
epitaxy on GaAs substrates. The choice of buffer layers plays a crucial role in
determining the resulting phase and consequently extends the array of materials
available for the physics of altermagnetism
Warto艣ci Polityczne
Ksi臋ga jubileuszowa dedykowana profesor Bogus艂awie Bednarczy
Antiferromagnetic Hysteresis Above the Spin Flop Field - source data for https://arxiv.org/abs/2109.00093
Magnetocrystalline anisotropy is essential in the physics of antiferromagnets and commonly treated as a constant, not depending on an external magnetic field. However, we demonstrate that in CoO the anisotropy should necessarily depend on the magnetic field, which is shown by the spin Hall magnetoresistance of the CoO | Pt device. Below the N茅el temperature CoO reveals a spin-flop transition at 240 K at 7.0 T, above which a hysteresis in the angular dependence of magnetoresistance unexpectedly persists up to 30 T. This behavior is shown to agree with the presence of the unquenched orbital momentum, which can play an important role in antiferromagnetic spintronics.</p