ELFT HÍRADÓ

[Janos Asboth <asboth AT phy.bme.hu>]

Meghívó

BME Elméleti Fizika Szeminárium,

április 30. péntek 10h15,
online a Microsoft Teams-ben
<https://teams.microsoft.com/l/meetup-join/19%3a35c712c192104aa998ed6bab3f0cbc07%40thread.tacv2/1619680413527?context=%7b%22Tid%22%3a%226a3548ab-7570-4271-91a8-58da00697029%22%2c%22Oid%22%3a%22c7eaf7d2-684b-4597-b217-6a9121400219%22%7d>
Deák András (BME Elm. Fiz. tanszék, PhD hallgató):
Ab initio study of weakly ferromagnetic antiferromagnets

Antiferromagnets have lately appeared in the forefront of spintronics
research. Collinear insulating antiferromagnets have exciting applications
in magnonic spin transport, while noncollinear antiferromagnets can show
for instance anomalous Hall effect or magnon-magnon scattering. In the talk
we will detail our investigations of two distinct systems: the noncollinear
antiferromagnet family Mn3Z with Z=Sn, Ge and Ga [1]; and hematite
(alpha-Fe2O3), a well-known collinear insulating antiferromagnet showing
weak ferromagnetism. We use a multiscale description by computing spin
model parameters from first principles and assessing the ground state spin
configuration and its stability using this model. With this approach we can
tackle the nature of the weak ferromagnetic distortion in these
antiferromagnets, and provide spin model parameters that can be used in
large-scale simulations of magnon dynamics effects.

[1]: B Nyári, A Deák, L Szunyogh, Phys. Rev. B 100, 144412 (2019)

Minden érdeklődőt szeretettel várunk.

Asbóth János
szemináriumi koordinátor