Noncollinear ferrimagnetism and anomalous Hall effects in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Mn</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:mi mathvariant="normal">N</mml:mi></mml:mrow></mml:math> thin films
Yangkun He, Simon Lenne, Z. Gercsi, Gwenaël Atcheson, J.C. O'Brien, D. Fruchart, Karsten Rode, J. M. D. Coey
Abstract
The magnetic structure of thin films of ferrimagnetic metallic Mn${}_{4}$N differs from the triangular ferrimagnetism of the bulk. Based on distance-dependence of Mn-Mn exchange and magnetic structures of other Mn${}_{3}$$X$N perovskites, a topological noncollinear spin structure is proposed for [001] Mn${}_{4}$N films with perpendicular anisotropy, which is confirmed by temperature-independent anomalous Hall conductivity coexisting with a normal temperature-dependent contribution. The study shows how a small symmetry change in the spin structure can influence magnetotransport properties of frustrated ferrimagnetic films.
Topics & Concepts
FerrimagnetismCondensed matter physicsHall effectMaterials scienceAnisotropySpin (aerodynamics)Electrical resistivity and conductivityPhysicsMagnetizationMagnetic fieldThermodynamicsQuantum mechanicsMagnetic properties of thin filmsMultiferroics and related materialsMagnetic and transport properties of perovskites and related materials