Buchter, A.Nagel, J.Rueffer, D.Xue, F.Weber, D. P.Kieler, O. F.Weimann, T.Kohlmann, J.Zorin, A. B.Russo-Averchi, E.Huber, R.Berberich, P.Fontcuberta I. Morral, A.Kemmler, M.Kleiner, R.Koelle, D.Grundler, D.Poggio, M.2013-10-012013-10-012013-10-01201310.1103/PhysRevLett.111.067202https://infoscience.epfl.ch/handle/20.500.14299/95633WOS:000322921200018Using an optimally coupled nanometer-scale SQUID, we measure the magnetic flux originating from an individual ferromagnetic Ni nanotube attached to a Si cantilever. At the same time, we detect the nanotube's volume magnetization using torque magnetometry. We observe both the predicted reversible and irreversible reversal processes. A detailed comparison with micromagnetic simulations suggests that vortexlike states are formed in different segments of the individual nanotube. Such stray-field free states are interesting for memory applications and noninvasive sensing.text::journal::journal article::research article