Chirality Switching and Winding or Unwinding of the Antiferromagnetic NiO Domain Walls inFe/NiO/Fe/CoO/Ag(001)

J. Li, A. Tan, S. Ma, R. F. Yang, E. Arenholz, C. Hwang, Z. Q. Qiu
2014 Physical Review Letters  
Fe/NiO/Fe/CoO/Ag(001) single crystalline films were grown epiaxially and investigated by X-ray Magnetic Circular Dichroism (XMCD) and X-ray Magnetic Linear Dichroism (XMLD). The bottom Fe layer magnetization is pinned through exchange coupling to the CoO layer and the top Fe layer magnetization can be rotated by an inplane external magnetic field. We find that the NiO spins wind up to form a domain wall due to the perpendicular NiO/Fe interfacial coupling as the top layer Fe magnetization
more » ... magnetization rotates from 0 o to 90 o , but switch wall chirality and unwind the wall as the Fe magnetization rotates from 90 o to 180 o . This observation shows that Mauri's 180 o domain wall does not exist in perpendicularly coupled FM/AFM system in the strong coupling regime.
doi:10.1103/physrevlett.113.147207 pmid:25325659 fatcat:x6ns6un2vzb6pggktkgf36cime