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We study the effciency of the magnetoimpedance (MI) of thin-wallcircumferentially ordered nanotubes in sub-GHz and GHz frequency regimes usingmicromagnetic simulations. We consider empty ferromagnetic tubes as well astubes filled with non-magnetic conductors of circular cross-section (nanowirecoverings) focusing on the low-field regime of MI (below the characteristicfield of the low-frequency ferromagnetic resonance). In this field area, theeffcient mechanism of MI is related to oscillations of the positions of(perpendicular to the tube axis) domain walls (DWs). Two mechanisms of drivingthe DW motion by the ac current are taken into account; the driving via theOersted field and via the spintransfer torque. The simulations are performedfor Co nanotubes of the diameter of 300nm. Achievable low-field MI exceeds100%, while the field region of a high sensitivity of that DW-based giant MI isof the width of tens of kA/m. The later is widely adjustable with changing thedensity of the driving ac current, its frequency, and the nanotube length. Ofparticular interest is the resonant motion of DW due to the interaction withthe nanotube ends the conditions of whom are discussed.

Domain-wall-assisted giant magnetoimpedance of thin-wall ferromagnetic nanotubes