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Magnetization Process in Vortex-imprinted Ni₈₀Fe₂₀/Ir₂₀Mn₈₀ Square Elements
H. Xu,J. Kolthammer,J. Rudge,E. Girgis,B. C. Choi,Y. K. Hong,G. Abo,Th. Speliotis,D. Niarchos 한국자기학회 2011 Journal of Magnetics Vol.16 No.2
The vortex-driven magnetization process of micron-sized, exchange-coupled square elements with composition of Ni??Fe₂? (12 ㎚)/Ir₂?Mn?? (5 ㎚) is investigated. The exchange-bias is introduced by field-cooling through the blocking temperature (TB) of the system, whereby Landau-shaped vortex states of the Ni??Fe₂? layer are imprinted into the Ir₂?Mn??. In the case of zero-field cooling, the exchange-coupling at the ferromagnetic/antiferromagnetic interface significantly enhances the vortex stability by increasing the nucleation and annihilation fields, while reducing coercivity and remanence. For the field-cooled elements, the hysteresis loops are shifted along the cooling field axis. The loop shift is attributed to the imprinting of displaced vortex state of Ni??Fe₂? into Ir₂?Mn??, which leads to asymmetric effective local pinning fields at the interface. The asymmetry of the hysteresis loop and the strength of the exchange-bias field can be tuned by varying the strength of cooling field. Micromagnetic modeling reproduces the experimentally observed vortex-driven magnetization process if the local pinning fields induced by exchange-coupling of the ferromagnetic and antiferromagnetic layers are taken into account.
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