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Stripe width variation in ultrathin magnetic films is a well known phenomenonstill not well understood. We analyze this problem considering a 2D Heisenbergmodel with ferromagnetic exchange interactions, dipolar interactions andperpendicular anisotropy, relevant e.g. in Fe/Cu(001) films. By extending aclassic result of Yafet & Gyorgy (YG) and using Monte Carlo simulations wecalculate the complete zero temperature phase diagram of the model. Throughthis calculation we analyze the correlation between domain walls structure andstripe width variation, as the perpendicular anisotropy changes. In particular,we found evidences that the recently detected canted state becomes the groundstate of the system close to the Spin Reorientation Transition (SRT) for anyvalue of the exchange to dipolar couplings ratio. Far away of the SRT thecanted ground state is replaced by a saturated stripes state, in whichin--plane magnetization components are only present inside the walls. We findthat the domain wall structure strongly depends on the perpendicularanisotropy: close to SRT it is well described by YG approximation, but a strongdeparture is observed in the large anisotropy limit. Moreover, we show thatstripe width variation is directly related to domain wall width variation withthe anisotropy.

Domain walls, canted states and stripe width variation in ultrathin magnetic films with perpendicular anisotropy