Helical magnetic structure of epitaxial films of nanolaminated Mn2GaC MAX phase

Funding Agencies|National Science Center, Poland [UMO-2019/35/B/ST3/03676]; Swedish Research Council [2019-04233]; Goeran Gustafsson Foundation for Research in Natural Sciences and Medicine; Deutsche Forschungsgemeinschaft [405553726]
Nanolaminated Mn2GaC epitaxial films crystallizing in the hexagonal structure belong to the family of MAX phase compounds and display complex magnetic interactions. While the critical temperature of the order-disorder transition is 507 K, at around 214 K this compound undergoes a first-order phase transition with the magnetic structure below the transition point not being fully resolved. Previous studies indicated a noncollinear spin arrangement, but a specific magnetic structure could not be defined. In this work we present the results of 69Ga, 71Ga, and 55Mn NMR experiments performed at 4.2 K in an external in-plane magnetic field up to 1 T. The in-depth analysis of the experimental results shows a helical magnetic structure consisting of the ferromagnetically coupled Mn-C-Mn slabs that are twisted across the Ga layer by 167.2 degrees with respect to the next Mn-C-Mn slab. As a result, the magnetic structure presents a spiral propagating along the out-of-plane direction (hexagonal c axis) with a pitch of around 14 lattice constants.

Jedryka, E.Polish Acad Sci, Poland (författare)
Kalvig, R.Polish Acad Sci, Poland (författare)
Wiedwald, U.Univ Duisburg Essen, Germany; Univ Duisburg Essen, Germany (författare)
Farle, M.Univ Duisburg Essen, Germany; Univ Duisburg Essen, Germany (författare)
Rosén, JohannaLinköpings universitet,Materialdesign,Tekniska fakulteten(Swepub:liu)johro07 (författare)
Wojcik, M.Polish Acad Sci, Poland (författare)
Polish Acad Sci, PolandUniv Duisburg Essen, Germany; Univ Duisburg Essen, Germany (creator_code:org_t)

Av författaren/redakt...: Dey, J.; Jedryka, E.; Kalvig, R.; Wiedwald, U.; Farle, M.; Rosén, Johanna; visa fler...; Wojcik, M.; visa färre...

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